{"id":163,"date":"2026-04-02T16:52:06","date_gmt":"2026-04-02T16:52:06","guid":{"rendered":"https:\/\/hxcnc.com\/?page_id=163"},"modified":"2026-05-14T05:53:39","modified_gmt":"2026-05-14T05:53:39","slug":"bearing-steel-cnc-machining","status":"publish","type":"page","link":"https:\/\/hxcnc.com\/uz\/bearing-steel-cnc-machining\/","title":{"rendered":"Rulman po'lat CNC ishlov berish"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"163\" class=\"elementor elementor-163\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f23ff8a e-con-full e-flex e-con e-parent\" data-id=\"f23ff8a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-de9ee6a elementor-widget elementor-widget-html\" data-id=\"de9ee6a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<!-- FAQ Structured Data -->\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is 52100 bearing steel and what makes it suitable for bearing applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"AISI 52100 (also known as SUJ2 in Japan and GCr15 in China) is a high-carbon, chromium-alloyed bearing steel specifically engineered for rolling contact fatigue resistance. Its composition \u2014 approximately 1.0% carbon and 1.5% chromium \u2014 produces a fine, uniform distribution of chromium carbides after heat treatment that gives exceptional hardness (HRC 60\u201364), wear resistance, and contact fatigue life. These properties make it the standard material for precision ball bearings, roller bearings, bearing races, precision ball screws, and other components subjected to repeated rolling contact stress.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between 52100, SUJ2, and GCr15 bearing steel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"52100 (AISI), SUJ2 (JIS G4805), and GCr15 (GB\/T 18254) are national standard designations for essentially the same bearing steel composition \u2014 high carbon (approximately 0.95\u20131.10%), chromium (1.30\u20131.65%), and small additions of manganese and silicon. Minor compositional differences exist between standards, but all three are functionally interchangeable for precision bearing and wear part applications. 52100 is the American designation used internationally; SUJ2 is specified by Japanese OEMs and in JIS supply chains; GCr15 is the Chinese GB standard and is the most commonly stocked grade in mainland China.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What hardness can 52100 bearing steel achieve after heat treatment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"52100 bearing steel achieves HRC 60\u201364 after standard quench and temper heat treatment \u2014 significantly harder than 440C stainless (HRC 58\u201360) and comparable to high-speed tool steels. The high hardness combined with fine chromium carbide distribution gives 52100 exceptional rolling contact fatigue life. Sub-zero treatment (cryogenic processing at \u221275\u00b0C to \u2212196\u00b0C) after quenching converts retained austenite to martensite, further increasing hardness and improving dimensional stability in service.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How should 52100 bearing steel be machined?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"52100 is typically machined in the annealed or spheroidized-annealed condition (approximately HRC 20\u201325) using conventional CNC turning and milling. After machining, parts are heat-treated to HRC 60\u201364, then precision-ground on all critical surfaces to recover final tolerance (\u00b10.002\u20130.005 mm) after heat treatment distortion. The annealed machinability is similar to medium-carbon alloy steel, though the high carbide content can cause more rapid tool wear than plain carbon steels. Sub-zero treatment is routinely applied after quench before tempering to maximize hardness and dimensional stability.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is sub-zero treatment and why is it important for bearing steel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Sub-zero treatment (also called cryogenic processing) is the cooling of hardened bearing steel to temperatures between \u221275\u00b0C and \u2212196\u00b0C immediately after quenching, before tempering. This low-temperature treatment converts retained austenite \u2014 a softer, metastable phase that remains after quenching \u2014 into martensite, the hard phase that gives bearing steel its properties. Without sub-zero treatment, retained austenite can transform to martensite in service under stress or temperature changes, causing dimensional growth and bearing failure. For precision bearing applications, sub-zero treatment is routinely specified to ensure dimensional stability and maximum hardness.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between bearing steel 52100 and tool steel D2 or H13?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"52100 bearing steel and tool steels (D2, H13) both achieve high hardness, but are engineered for different stress types. 52100 is specifically optimized for rolling contact fatigue \u2014 the repeated hertzian contact stress in bearings \u2014 through its fine, uniformly distributed chromium carbide microstructure and extremely high cleanliness (low inclusion content). Tool steels like D2 are optimized for wear resistance in sliding contact and impact. 52100 has higher fatigue life under rolling contact but lower toughness and shock resistance compared to D2. For bearing components and precision rolling elements, 52100\/GCr15 is the correct choice; for dies, punches, and cutting tools, D2 or H13 is more appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What tolerances can you hold on precision bearing steel parts after grinding?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"After heat treatment and precision cylindrical grinding, we hold tolerances of \u00b10.002\u20130.005 mm on critical bearing seat diameters and bore dimensions. Roundness (out-of-roundness) can be controlled to 0.001\u20130.002 mm on precision ground bearing races. Surface roughness Ra 0.2\u20130.4 \u03bcm is standard on ground bearing surfaces; Ra 0.05\u20130.1 \u03bcm is achievable with superfinishing. All critical dimensions are CMM-verified before release.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What surface treatments are compatible with 52100 bearing steel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Black oxide is the most common surface treatment for 52100 bearing steel parts \u2014 it provides light corrosion protection with essentially zero dimensional change, and is compatible with the hardened surface. Phosphate coating is also used for similar reasons. Hard chrome plating and electroless nickel can be applied for enhanced corrosion protection but must be applied carefully to avoid hydrogen embrittlement in high-hardness steel. PVD coatings (TiN, DLC) are used on precision bearing components to further reduce friction and improve wear life. Conventional passivation is not applicable to bearing steel as it is not a stainless steel.\"\n      }\n    }\n  ]\n}\n<\/script>\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Roboto:wght@300;400;500;700;900&family=Roboto+Condensed:wght@400;700;900&family=Roboto+Mono:wght@400;500&display=swap\" rel=\"stylesheet\">\n\n<style>\n:root{\n  --bg:#F7F9FC;--bg-white:#FFFFFF;--bg-light:#EEF3F8;\n  --text-1:#1F2937;--text-2:#5B6777;--text-3:#9CA8B4;\n  --border:#D7E0EA;\n  --blue:#2563EB;--blue-h:#1D4ED8;\n  --blue-dim:rgba(37,99,235,0.08);--blue-mid:rgba(37,99,235,0.15);\n  --teal:#0F766E;--teal-dim:rgba(15,118,110,0.08);\n  --ff-h:'Roboto Condensed',sans-serif;\n  --ff-b:'Roboto',sans-serif;\n  --ff-m:'Roboto Mono',monospace;\n  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rgba(31,41,55,0.05);}\n@media(max-width:768px){.ht-strip{grid-template-columns:1fr 1fr;}}\n.ht-step{padding:24px 18px;border-right:1px solid var(--border);text-align:center;transition:background 0.18s;}\n.ht-step:last-child{border-right:none;}\n.ht-step:hover{background:var(--bg-light);}\n.ht-ico{width:48px;height:48px;border-radius:50%;background:var(--blue-dim);border:1.5px solid rgba(37,99,235,0.2);display:flex;align-items:center;justify-content:center;font-size:20px;margin:0 auto 12px;}\n.ht-title{font-family:var(--ff-h);font-size:13px;font-weight:700;color:var(--text-1);margin-bottom:5px;}\n.ht-temp{font-family:var(--ff-m);font-size:11px;color:var(--blue);margin-bottom:5px;}\n.ht-desc{font-size:11px;color:var(--text-2);line-height:1.55;}\n\n\/* \u2550\u2550 CAPABILITIES \u2550\u2550 *\/\n.cap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}\n@media(max-width:900px){.cap-grid{grid-template-columns:1fr 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var(--border);font-family:var(--ff-m);font-size:10px;color:var(--text-3);}\n\n\/* \u2550\u2550 TYPICAL PARTS \u2550\u2550 *\/\n.parts-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;}\n@media(max-width:800px){.parts-grid{grid-template-columns:1fr 1fr;}}\n@media(max-width:500px){.parts-grid{grid-template-columns:1fr;}}\n.part-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;transition:all 0.22s;cursor:pointer;}\n.part-card:hover{border-color:var(--blue);transform:translateY(-3px);box-shadow:0 10px 28px rgba(37,99,235,0.1);}\n.pc-img{aspect-ratio:4\/3;overflow:hidden;position:relative;}\n.pc-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.45s;}\n.part-card:hover .pc-img img{transform:scale(1.07);}\n.pc-badge{position:absolute;top:10px;left:10px;padding:3px 10px;border-radius:100px;background:rgba(255,255,255,0.9);backdrop-filter:blur(4px);font-family:var(--ff-m);font-size:10px;font-weight:700;color:var(--blue);}\n.pc-body{padding:16px;}\n.pc-title{font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);margin-bottom:8px;}\n.pc-row{display:flex;gap:8px;font-size:11px;margin-bottom:4px;}\n.pc-k{font-family:var(--ff-m);font-size:10px;min-width:52px;color:var(--text-3);}\n.pc-v{font-size:12px;color:var(--text-2);}\n\n\/* \u2550\u2550 CASE STUDIES \u2550\u2550 *\/\n.case-list{display:flex;flex-direction:column;gap:28px;}\n.case-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--r4);overflow:hidden;transition:all 0.25s;}\n.case-card:hover{border-color:var(--blue);box-shadow:0 12px 40px rgba(37,99,235,0.1);}\n.case-inner{display:grid;grid-template-columns:400px 1fr;}\n@media(max-width:900px){.case-inner{grid-template-columns:1fr;}}\n.case-inner.rev{direction:rtl;}\n.case-inner.rev>*{direction:ltr;}\n.case-imgs{display:flex;flex-direction:column;}\n.ci-main{flex:1;overflow:hidden;min-height:260px;}\n.ci-main img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.case-card:hover .ci-main img{transform:scale(1.04);}\n.ci-row{display:grid;grid-template-columns:1fr 1fr;border-top:3px solid #fff;}\n.ci-sm{overflow:hidden;aspect-ratio:4\/3;}\n.ci-sm img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.case-card:hover .ci-sm img{transform:scale(1.06);}\n.case-body{padding:32px;display:flex;flex-direction:column;justify-content:center;}\n.case-num{font-family:var(--ff-m);font-size:10px;color:var(--text-3);letter-spacing:2px;text-transform:uppercase;margin-bottom:10px;}\n.case-title{font-family:var(--ff-h);font-size:20px;font-weight:700;color:var(--text-1);margin-bottom:14px;line-height:1.2;}\n.case-tags{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:16px;}\n.case-row{display:grid;grid-template-columns:80px 1fr;gap:8px;margin-bottom:9px;align-items:start;}\n.cr-k{font-family:var(--ff-m);font-size:10px;color:var(--text-3);letter-spacing:1px;text-transform:uppercase;padding-top:1px;}\n.cr-v{font-size:13px;color:var(--text-2);line-height:1.6;}\n.cr-v strong{color:var(--text-1);font-weight:600;}\n.case-outcome{padding:13px 15px;background:var(--blue-dim);border:1px solid rgba(37,99,235,0.18);border-radius:var(--r2);font-size:13px;color:var(--text-2);line-height:1.65;margin:14px 0 18px;}\n.case-outcome strong{color:var(--blue);}\n\n\/* \u2550\u2550 COMPARISON TABLE \u2550\u2550 *\/\n.cmp-table-wrap{overflow-x:auto;}\n.cmp-table{width:100%;border-collapse:collapse;border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;min-width:540px;}\n.cmp-table thead th{padding:11px 14px;background:var(--bg-light);font-family:var(--ff-h);font-size:11px;font-weight:700;color:var(--text-2);letter-spacing:.5px;text-transform:uppercase;text-align:left;border-bottom:1.5px solid var(--border);}\n.cmp-table thead th:nth-child(2){color:var(--blue);}\n.cmp-table thead th:nth-child(3){color:var(--blue);}\n.cmp-table thead th:nth-child(4){color:var(--blue);}\n.cmp-table thead th:nth-child(5){color:var(--text-3);}\n.cmp-table thead th:nth-child(6){color:var(--text-3);}\n.cmp-table tbody td{padding:11px 14px;font-size:12px;color:var(--text-2);border-bottom:1px solid var(--border);vertical-align:top;}\n.cmp-table tbody tr:last-child td{border-bottom:none;}\n.cmp-table tbody tr:hover td{background:var(--bg-light);}\n.cmp-table tbody td:first-child{font-family:var(--ff-m);font-size:10px;color:var(--text-3);letter-spacing:1px;text-transform:uppercase;white-space:nowrap;font-weight:500;}\n\n\/* \u2550\u2550 PROCESS FLOW \u2550\u2550 *\/\n.flow-strip{display:grid;grid-template-columns:repeat(5,1fr);border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;background:#fff;box-shadow:0 2px 12px rgba(31,41,55,0.05);}\n@media(max-width:768px){.flow-strip{grid-template-columns:1fr 1fr;}}\n.flow-step{border-right:1px solid var(--border);transition:background 0.18s;}\n.flow-step:last-child{border-right:none;}\n.flow-step:hover{background:var(--bg-light);}\n.fs-img{aspect-ratio:4\/3;overflow:hidden;}\n.fs-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.flow-step:hover .fs-img img{transform:scale(1.07);}\n.fs-body{padding:16px;}\n.fs-num{font-family:var(--ff-m);font-size:10px;color:var(--blue);letter-spacing:2px;font-weight:700;margin-bottom:7px;}\n.fs-title{font-family:var(--ff-h);font-size:13px;font-weight:700;color:var(--text-1);margin-bottom:5px;}\n.fs-desc{font-size:11px;color:var(--text-2);line-height:1.6;}\n\n\/* \u2550\u2550 SURFACE TREATMENTS \u2550\u2550 *\/\n.sf-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}\n@media(max-width:900px){.sf-grid{grid-template-columns:1fr 1fr;}}\n.sf-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;transition:all 0.22s;}\n.sf-card:hover{border-color:var(--teal);transform:translateY(-2px);box-shadow:0 8px 24px rgba(15,118,110,0.1);}\n.sf-img{aspect-ratio:4\/3;overflow:hidden;}\n.sf-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s;}\n.sf-card:hover .sf-img img{transform:scale(1.05);}\n.sf-body{padding:16px;}\n.sf-name{font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);margin-bottom:6px;}\n.sf-desc{font-size:12px;color:var(--text-2);line-height:1.65;margin-bottom:10px;}\n.sf-tags{display:flex;flex-wrap:wrap;gap:4px;}\n.sft{padding:2px 8px;border-radius:100px;background:var(--teal-dim);border:1px solid rgba(15,118,110,0.2);font-family:var(--ff-m);font-size:10px;color:var(--teal);}\n\n\/* \u2550\u2550 WHY US \u2550\u2550 *\/\n.why-layout{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;}\n@media(max-width:800px){.why-layout{grid-template-columns:1fr;}}\n.why-img{border-radius:var(--r3);overflow:hidden;aspect-ratio:4\/3;border:1px solid var(--border);box-shadow:0 4px 24px rgba(31,41,55,0.08);}\n.why-img img{width:100%;height:100%;object-fit:cover;}\n.why-img:has(video){aspect-ratio:auto;}\n.why-img video{display:block;width:100%;height:auto;object-fit:contain;}\n.why-points{display:flex;flex-direction:column;gap:14px;}\n.wp-item{display:flex;gap:13px;align-items:flex-start;padding:16px;background:#fff;border:1.5px solid var(--border);border-radius:var(--r2);transition:all 0.2s;}\n.wp-item:hover{border-color:var(--blue);}\n.wp-ico{width:38px;height:38px;border-radius:10px;background:var(--blue-dim);border:1px solid rgba(37,99,235,0.15);display:flex;align-items:center;justify-content:center;font-family:var(--ff-m);font-size:12px;font-weight:700;color:var(--blue);flex-shrink:0;}\n.wp-title{font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);margin-bottom:4px;}\n.wp-desc{font-size:12px;color:var(--text-2);line-height:1.65;}\n\n\/* \u2550\u2550 INDUSTRY MINI \u2550\u2550 *\/\n.ind-row{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;}\n@media(max-width:900px){.ind-row{grid-template-columns:repeat(3,1fr);}}\n@media(max-width:480px){.ind-row{grid-template-columns:1fr 1fr;}}\n.ind-mini{padding:18px 12px;text-align:center;background:#fff;border:1.5px solid var(--border);border-radius:var(--r2);transition:all 0.2s;}\n.ind-mini:hover{border-color:var(--blue);box-shadow:0 6px 18px rgba(37,99,235,0.09);}\n.im-icon{font-size:22px;margin-bottom:8px;}\n.im-name{font-family:var(--ff-h);font-size:13px;font-weight:700;color:var(--text-1);margin-bottom:3px;}\n.im-grade{font-family:var(--ff-m);font-size:10px;color:var(--text-3);}\n\n\/* \u2550\u2550 FAQ \u2550\u2550 *\/\n.faq-layout{display:grid;grid-template-columns:1fr 2fr;gap:56px;align-items:start;}\n@media(max-width:800px){.faq-layout{grid-template-columns:1fr;}}\n.faq-list{border:1.5px solid var(--border);border-radius:var(--r3);overflow:hidden;}\n.faq-item{border-bottom:1px solid var(--border);}\n.faq-item:last-child{border-bottom:none;}\n.faq-q{width:100%;padding:18px 22px;background:none;border:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:14px;font-family:var(--ff-h);font-size:14px;font-weight:700;color:var(--text-1);text-align:left;transition:background 0.15s;}\n.faq-q:hover{background:var(--bg-light);}\n.faq-q.open{color:var(--blue);background:var(--blue-dim);}\n.faq-icon{width:24px;height:24px;border-radius:50%;background:var(--bg-light);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0;transition:all 0.2s;color:var(--text-2);}\n.faq-q.open .faq-icon{background:var(--blue);border-color:var(--blue);color:#fff;transform:rotate(45deg);}\n.faq-a{display:none;padding:0 22px 18px;font-size:14px;color:var(--text-2);line-height:1.75;}\n.faq-a.open{display:block;}\n\n\/* \u2550\u2550 METRICS \u2550\u2550 *\/\n.metrics{display:grid;grid-template-columns:repeat(4,1fr);background:var(--blue);}\n@media(max-width:640px){.metrics{grid-template-columns:1fr 1fr;}}\n.metric{padding:36px 24px;text-align:center;border-right:1px solid rgba(255,255,255,0.15);}\n.metric:last-child{border-right:none;}\n.metric-val{font-family:var(--ff-h);font-size:38px;font-weight:900;color:#fff;line-height:1;}\n.metric-unit{font-size:16px;}\n.metric-lbl{font-family:var(--ff-m);font-size:10px;letter-spacing:2px;text-transform:uppercase;color:rgba(255,255,255,0.6);margin-top:8px;}\n\n\/* \u2550\u2550 CTA \u2550\u2550 *\/\n.cta{position:relative;padding:100px 0;overflow:hidden;}\n.cta-bg{position:absolute;inset:0;}\n.cta-bg img{width:100%;height:100%;object-fit:cover;filter:brightness(0.24);}\n.cta-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(37,99,235,0.78),rgba(15,118,110,0.52));}\n.cta-dots{position:absolute;inset:0;background-image:radial-gradient(circle,rgba(255,255,255,0.1) 1px,transparent 1px);background-size:24px 24px;}\n.cta-inner{position:relative;z-index:2;text-align:center;}\n.cta-lbl{display:inline-flex;align-items:center;gap:8px;font-family:var(--ff-m);font-size:11px;font-weight:500;letter-spacing:3px;text-transform:uppercase;color:rgba(255,255,255,0.6);margin-bottom:16px;justify-content:center;}\n.cta-lbl::before{content:'';width:16px;height:1.5px;background:rgba(255,255,255,0.5);}\n.cta-h2{font-family:var(--ff-h);font-size:clamp(26px,3.5vw,52px);font-weight:700;color:#fff;margin-bottom:14px;line-height:1.1;}\n.cta-sub{font-size:16px;color:rgba(255,255,255,0.75);margin-bottom:36px;max-width:520px;margin-left:auto;margin-right:auto;line-height:1.75;}\n.cta-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}\n\n\/* machining notes 2-col *\/\n.mc-cols{display:grid;grid-template-columns:1fr 1fr;gap:20px;}\n@media(max-width:700px){.mc-cols{grid-template-columns:1fr;}}\n.mc-box{padding:24px;background:#fff;border:1.5px solid var(--border);border-radius:var(--r3);}\n.mc-head{font-family:var(--ff-h);font-size:16px;font-weight:700;color:var(--text-1);margin-bottom:14px;display:flex;align-items:center;gap:10px;}\n.mc-ico{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0;}\n.mc-ico-red{background:rgba(239,68,68,0.1);}\n.mc-ico-blue{background:var(--blue-dim);}\n.mc-row{display:flex;gap:8px;align-items:flex-start;font-size:13px;color:var(--text-2);margin-bottom:10px;line-height:1.6;}\n.mc-row:last-child{margin-bottom:0;}\n.mc-dot-r{color:#DC2626;font-weight:700;flex-shrink:0;}\n.mc-dot-b{color:var(--blue);font-weight:700;flex-shrink:0;}\n.mc-row strong{color:var(--text-1);font-weight:600;display:block;margin-bottom:2px;}\n<\/style>\n<!-- BREADCRUMB -->\n<div class=\"breadcrumb\">\n  <div class=\"wrap\">\n    <div class=\"bc-inner\">\n      <a href=\"\/\">Home<\/a><span class=\"bc-sep\">\/<\/span>\n      <a href=\"\/material\/\">Materials<\/a><span class=\"bc-sep\">\/<\/span>\n      <a href=\"\/material\/\">Steel<\/a><span class=\"bc-sep\">\/<\/span>\n      <span class=\"bc-current\">Bearing Steel \u2014 52100 \/ SUJ2 \/ GCr15<\/span>\n    <\/div>\n  <\/div>\n<\/div>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     1. HERO\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"hero\">\n  <div class=\"hero-dot\"><\/div>\n  <div class=\"wrap\">\n    <div class=\"hero-inner\">\n      <div>\n        <div class=\"label\">Bearing Steel CNC Machining<\/div>\n        <h1 class=\"hero-h1\">Bearing Steel<br><span class=\"blue\">CNC Machining<\/span><\/h1>\n        <div class=\"hero-kicker\">\n          <span class=\"hk-pill\"><span class=\"hk-dot\"><\/span>52100 \/ SUJ2 \/ GCr15<\/span>\n          <span class=\"hk-pill\"><span class=\"hk-dot\"><\/span>HRC 60\u201364 After Q&T<\/span>\n          <span class=\"hk-pill\"><span class=\"hk-dot\"><\/span>Sub-Zero Treatment<\/span>\n          <span class=\"hk-pill\"><span class=\"hk-dot\"><\/span>Precision Grinding \u00b10.002 mm<\/span>\n          <span class=\"hk-pill\"><span class=\"hk-dot\"><\/span>Bearings \u00b7 Ball Screws \u00b7 Wear Parts<\/span>\n        <\/div>\n        <p class=\"hero-sub\">CNC machining of 52100, SUJ2, and GCr15 high-carbon chromium bearing steel \u2014 the definitive material for rolling contact fatigue applications. Full heat treatment, sub-zero treatment, precision grinding, and superfinishing managed as a single-source process.<\/p>\n        <div class=\"hero-btns\">\n          <a href=\"#quote\" class=\"btn btn-primary\">Get a Quote \u2192<\/a>\n          <a href=\"#quote\" class=\"btn btn-outline\">Send Your Drawing<\/a>\n        <\/div>\n      <\/div>\n\n      <div class=\"hero-imgs\">\n        <div class=\"hi-main\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Precision-Shafts-scaled.jpg\" alt=\"Bearing Steel 52100 GCr15 Precision Ground Parts\">\n        <\/div>\n        <div class=\"hi-badge\">\n          <div class=\"hib-l\">Max Hardness<\/div>\n          <div class=\"hib-v\">HRC 60\u201364<\/div>\n        <\/div>\n        <div class=\"hi-sm1\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Bearing-Steel-scaled.jpg\" alt=\"CNC Turning Bearing Steel Annealed\">\n        <\/div>\n        <div class=\"hi-sm2\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Bearing-Housings-Bores-scaled.webp\" alt=\"Precision Grinding 52100 Post Heat Treatment\">\n        <\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"hero-bar\">\n      <div class=\"hbar-item\"><div class=\"hbar-v\">52100<\/div><div class=\"hbar-l\">= SUJ2 = GCr15<\/div><\/div>\n      <div class=\"hbar-item\"><div class=\"hbar-v\">HRC 60\u201364<\/div><div class=\"hbar-l\">After Q&T + Sub-Zero<\/div><\/div>\n      <div class=\"hbar-item\"><div class=\"hbar-v\">\u00b10.002<span style=\"font-size:12px\">mm<\/span><\/div><div class=\"hbar-l\">Precision Grinding<\/div><\/div>\n      <div class=\"hbar-item\"><div class=\"hbar-v\">24hr<\/div><div class=\"hbar-l\">Quote Turnaround<\/div><\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- TICKER -->\n<div class=\"ticker\">\n  <div class=\"tick-track\">\n    <span class=\"tick-item\">52100 Bearing Steel <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">SUJ2 (JIS Standard) <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">GCr15 (GB Standard) <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">HRC 60\u201364 After Heat Treatment <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Sub-Zero Cryogenic Processing <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Precision OD\/ID Grinding <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Ball Bearings &amp; Races <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Precision Ball Screws <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Wear Parts &amp; Rollers <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">52100 Bearing Steel <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">SUJ2 (JIS Standard) <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">GCr15 (GB Standard) <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">HRC 60\u201364 After Heat Treatment <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Sub-Zero Cryogenic Processing <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Precision OD\/ID Grinding <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Ball Bearings &amp; Races <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Precision Ball Screws <span class=\"tick-sep\">\u2726<\/span><\/span>\n    <span class=\"tick-item\">Wear Parts &amp; Rollers <span class=\"tick-sep\">\u2726<\/span><\/span>\n  <\/div>\n<\/div>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     2. GRADE EQUIVALENCE \u2014 unique block for this page\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Material Grades<\/div>\n        <h2 class=\"h2\">52100 \u00b7 SUJ2 \u00b7 GCr15 \u2014 <span class=\"blue\">One Steel, Three Standards<\/span><\/h2>\n      <\/div>\n    <\/div>\n\n    <!-- equivalence block \u2014 special to bearing steel -->\n    <div class=\"equiv-block\">\n      <div class=\"equiv-header\">\n        <div>\n          <div class=\"equiv-header-title\">Global Standard Equivalents<\/div>\n          <div class=\"equiv-header-sub\">52100, SUJ2, and GCr15 are the same high-carbon chromium bearing steel composition expressed in three national standards \u2014 AISI (USA), JIS (Japan), and GB (China). All are interchangeable for precision bearing and wear part applications.<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"equiv-grid\">\n        <div class=\"equiv-col\">\n          <div class=\"eq-std\">AISI \u00b7 American Standard<\/div>\n          <div class=\"eq-grade\">52100<\/div>\n          <div class=\"eq-full\">High-Carbon Chromium Bearing Steel<\/div>\n          <div class=\"eq-desc\">The internationally recognized designation. Specified on drawings from American OEMs and widely used in international aerospace, automotive, and precision engineering supply chains. The reference designation when cross-referencing between standards.<\/div>\n          <div class=\"eq-market\">\ud83c\udf10 International \/ USA<\/div>\n        <\/div>\n        <div class=\"equiv-col\">\n          <div class=\"eq-std\">JIS G4805 \u00b7 Japanese Standard<\/div>\n          <div class=\"eq-grade\">SUJ2<\/div>\n          <div class=\"eq-full\">\u9ad8\u70ad\u7d20\u30af\u30ed\u30e0\u8ef8\u53d7\u92fc\u92fc\u7ba1 Grade 2<\/div>\n          <div class=\"eq-desc\">Specified by Japanese OEMs \u2014 Toyota, Honda, NSK, NTN \u2014 and all JIS-standard supply chains. Functionally equivalent to 52100 in all properties. When a Japanese customer specifies SUJ2, it is the same material as 52100 \/ GCr15 and will be sourced and supplied accordingly.<\/div>\n          <div class=\"eq-market\">\ud83c\uddef\ud83c\uddf5 Japan \u00b7 JIS Supply Chain<\/div>\n        <\/div>\n        <div class=\"equiv-col\">\n          <div class=\"eq-std\">GB\/T 18254 \u00b7 Chinese Standard<\/div>\n          <div class=\"eq-grade\">GCr15<\/div>\n          <div class=\"eq-full\">\u9ad8\u78b3\u94ec\u8f74\u627f\u94a2 \u2014 \"Cr15\" = 1.5% Cr<\/div>\n          <div class=\"eq-desc\">The standard designation in mainland China. \"G\" stands for \u6eda\u52a8\u8f74\u627f\u94a2 (rolling bearing steel), \"Cr15\" indicates approximately 1.5% chromium content. The most commonly stocked bearing steel in China \u2014 if you are sourcing from a Chinese manufacturer, GCr15 is what will be supplied for a 52100 specification.<\/div>\n          <div class=\"eq-market\">\ud83c\udde8\ud83c\uddf3 China \u00b7 GB Supply Chain<\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n\n    <!-- composition cards -->\n    <div style=\"margin-bottom:16px;\">\n      <div class=\"label\">Chemical Composition (Typical Ranges)<\/div>\n    <\/div>\n    <div class=\"comp-grid\">\n      <div class=\"comp-card\">\n        <div class=\"cc-grade\">52100<\/div>\n        <div class=\"cc-std\">AISI \/ SAE \u2014 Per ASTM A295<\/div>\n        <table class=\"comp-table-inner\">\n          <tr><td>Carbon (C)<\/td><td>0.98\u20131.10%<\/td><\/tr>\n          <tr><td>Chromium (Cr)<\/td><td>1.30\u20131.60%<\/td><\/tr>\n          <tr><td>Manganese (Mn)<\/td><td>0.25\u20130.45%<\/td><\/tr>\n          <tr><td>Silicon (Si)<\/td><td>0.15\u20130.35%<\/td><\/tr>\n          <tr><td>Sulfur (S) max<\/td><td>0.015%<\/td><\/tr>\n          <tr><td>Phosphorus (P) max<\/td><td>0.025%<\/td><\/tr>\n        <\/table>\n      <\/div>\n      <div class=\"comp-card\">\n        <div class=\"cc-grade\">SUJ2<\/div>\n        <div class=\"cc-std\">JIS G4805 \u2014 Japanese Standard<\/div>\n        <table class=\"comp-table-inner\">\n          <tr><td>Carbon (C)<\/td><td>0.95\u20131.10%<\/td><\/tr>\n          <tr><td>Chromium (Cr)<\/td><td>1.30\u20131.60%<\/td><\/tr>\n          <tr><td>Manganese (Mn)<\/td><td>0.50% max<\/td><\/tr>\n          <tr><td>Silicon (Si)<\/td><td>0.15\u20130.35%<\/td><\/tr>\n          <tr><td>Sulfur (S) max<\/td><td>0.025%<\/td><\/tr>\n          <tr><td>Phosphorus (P) max<\/td><td>0.025%<\/td><\/tr>\n        <\/table>\n      <\/div>\n      <div class=\"comp-card\">\n        <div class=\"cc-grade\">GCr15<\/div>\n        <div class=\"cc-std\">GB\/T 18254 \u2014 Chinese Standard<\/div>\n        <table class=\"comp-table-inner\">\n          <tr><td>Carbon (C)<\/td><td>0.95\u20131.05%<\/td><\/tr>\n          <tr><td>Chromium (Cr)<\/td><td>1.40\u20131.65%<\/td><\/tr>\n          <tr><td>Manganese (Mn)<\/td><td>0.25\u20130.45%<\/td><\/tr>\n          <tr><td>Silicon (Si)<\/td><td>0.15\u20130.35%<\/td><\/tr>\n          <tr><td>Sulfur (S) max<\/td><td>0.020%<\/td><\/tr>\n          <tr><td>Phosphorus (P) max<\/td><td>0.027%<\/td><\/tr>\n        <\/table>\n      <\/div>\n    <\/div>\n    <div style=\"padding:14px 16px;background:var(--bg-light);border:1px solid var(--border);border-radius:var(--r2);font-size:13px;color:var(--text-2);line-height:1.65;\">\n      <strong style=\"color:var(--text-1);\">Note on Cleanliness:<\/strong> High-performance bearing steel is produced under tighter cleanliness standards than general alloy steel \u2014 oxygen content, inclusion count, and carbide network distribution are controlled during steelmaking. We source bearing steel with full mill certs including cleanliness verification for precision bearing applications. Standard commercial GCr15\/52100 bar is suitable for general wear parts; vacuum-degassed or electroslag remelted (ESR) grades are available on request for highest-fatigue-life bearing applications.\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     3. WHY BEARING STEEL\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-light\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Material Science<\/div>\n        <h2 class=\"h2\">Why 52100 \/ GCr15 for <span class=\"blue\">Rolling Contact Applications<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"why-bearing\">\n      <div class=\"wb-img\">\n        <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Precision-Turned-Shaft.jpg\" alt=\"52100 Bearing Steel Precision Ground Parts\">\n      <\/div>\n      <div>\n        <p style=\"font-size:15px;color:var(--text-2);line-height:1.8;margin-bottom:20px;\">Bearing steel is not just hard \u2014 it is engineered at the microstructural level for a specific failure mode: rolling contact fatigue. The fine, uniform chromium carbide distribution produced by proper heat treatment is what distinguishes bearing steel from general high-carbon or tool steels of similar hardness.<\/p>\n        <div class=\"wb-pillars\">\n          <div class=\"wb-item\">\n            <div class=\"wb-ico\">HRC<\/div>\n            <div>\n              <div class=\"wb-title\">HRC 60\u201364 \u2014 Highest Standard Achievable in Through-Hardened Steel<\/div>\n              <div class=\"wb-desc\">The 1.0% carbon + 1.5% chromium composition produces maximum martensite hardness after quench \u2014 harder than 440C stainless and comparable to high-speed steel, with superior uniformity through the cross-section.<\/div>\n            <\/div>\n          <\/div>\n          <div class=\"wb-item\">\n            <div class=\"wb-ico\">Cr<\/div>\n            <div>\n              <div class=\"wb-title\">Chromium Carbides \u2014 Fine, Uniform Distribution<\/div>\n              <div class=\"wb-desc\">Chromium promotes a fine, uniformly distributed carbide network after proper heat treatment. These carbides resist deformation under hertzian contact stress \u2014 the repeated subsurface stress pattern in rolling bearings that causes fatigue spalling in softer or less uniform materials.<\/div>\n            <\/div>\n          <\/div>\n          <div class=\"wb-item\">\n            <div class=\"wb-ico\">\u2713<\/div>\n            <div>\n              <div class=\"wb-title\">Rolling Contact Fatigue Life \u2014 Purpose-Engineered<\/div>\n              <div class=\"wb-desc\">52100 was specifically developed (and has been refined for over 100 years) to maximize L10 bearing fatigue life \u2014 the number of cycles to first fatigue failure. No other common steel matches its rolling contact fatigue performance per unit cost.<\/div>\n            <\/div>\n          <\/div>\n          <div class=\"wb-item\">\n            <div class=\"wb-ico\">Ra<\/div>\n            <div>\n              <div class=\"wb-title\">Excellent Polishability for Bearing Surfaces<\/div>\n              <div class=\"wb-desc\">The fine carbide microstructure of 52100 accepts superfinishing to Ra 0.05\u20130.1 \u03bcm \u2014 essential for bearing races and ball screw surfaces where surface roughness directly controls contact stress concentration and fatigue life.<\/div>\n            <\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     HEAT TREATMENT WORKFLOW\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div style=\"text-align:center;margin-bottom:40px;\">\n      <div class=\"label\" style=\"justify-content:center;\">Heat Treatment Process<\/div>\n      <h2 class=\"h2\">From Annealed Bar to <span class=\"blue\">HRC 62 Precision Ground Part<\/span><\/h2>\n      <p style=\"font-size:14px;color:var(--text-2);max-width:640px;margin:14px auto 0;line-height:1.75;\">Bearing steel heat treatment is more controlled than general alloy steel \u2014 austenitizing temperature window is narrow, sub-zero treatment is routinely required, and tempering must be low enough to preserve maximum hardness while reducing brittleness.<\/p>\n    <\/div>\n    <div class=\"ht-strip\">\n      <div class=\"ht-step\">\n        <div class=\"ht-ico\">\ud83d\udd29<\/div>\n        <div class=\"ht-title\">Rough Machine<\/div>\n        <div class=\"ht-temp\">Annealed \u2014 ~HRC 20<\/div>\n        <div class=\"ht-desc\">CNC turning and milling with 0.2\u20130.5 mm grinding stock left on all critical surfaces. Annealed spheroidized condition for cleanest chip formation.<\/div>\n      <\/div>\n      <div class=\"ht-step\">\n        <div class=\"ht-ico\">\ud83d\udd25<\/div>\n        <div class=\"ht-title\">Austenitize<\/div>\n        <div class=\"ht-temp\">820\u2013860\u00b0C (52100)<\/div>\n        <div class=\"ht-desc\">Narrow temperature window \u2014 lower than alloy steels. Dissolves carbon into austenite without excessive carbide coarsening. Atmosphere-controlled furnace prevents decarburization.<\/div>\n      <\/div>\n      <div class=\"ht-step\">\n        <div class=\"ht-ico\">\u2744<\/div>\n        <div class=\"ht-title\">Quench + Sub-Zero<\/div>\n        <div class=\"ht-temp\">Oil \u2192 \u221275\u00b0C to \u2212196\u00b0C<\/div>\n        <div class=\"ht-desc\">Oil quench to room temperature, then immediately to sub-zero. Converts retained austenite to martensite \u2014 critical for dimensional stability and maximum hardness. Sub-zero is routinely specified, not optional, for precision bearing parts.<\/div>\n      <\/div>\n      <div class=\"ht-step\">\n        <div class=\"ht-ico\">\ud83c\udf21<\/div>\n        <div class=\"ht-title\">Low Temper<\/div>\n        <div class=\"ht-temp\">150\u2013180\u00b0C<\/div>\n        <div class=\"ht-desc\">Low tempering temperature preserves maximum hardness (HRC 60\u201364) while reducing brittleness. Higher tempering temperatures sacrifice hardness for toughness \u2014 specified only when application demands it.<\/div>\n      <\/div>\n      <div class=\"ht-step\">\n        <div class=\"ht-ico\">\u2699<\/div>\n        <div class=\"ht-title\">Precision Grind<\/div>\n        <div class=\"ht-temp\">\u00b10.002\u20130.005 mm<\/div>\n        <div class=\"ht-desc\">OD\/ID cylindrical grinding recovers final tolerance after heat treatment distortion. Superfinishing to Ra 0.05\u20130.1 \u03bcm on bearing contact surfaces as required.<\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     MACHINING CONSIDERATIONS\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-light\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Machining Notes<\/div>\n        <h2 class=\"h2\">Machining 52100 \/ GCr15 \u2014 <span class=\"blue\">Key Considerations<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"mc-cols\">\n      <div class=\"mc-box\">\n        <div class=\"mc-head\"><div class=\"mc-ico mc-ico-red\">\u26a0<\/div>Challenges with Bearing Steel<\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-r\">!<\/span><div><strong>High carbide content \u2014 abrasive on cutting tools<\/strong>The chromium carbides in 52100 are significantly harder than the steel matrix. Cutting tools wear faster than on equivalent-hardness plain steel \u2014 tool change intervals must be planned to avoid surface degradation late in the insert life.<\/div><\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-r\">!<\/span><div><strong>Decarburization risk during heat treatment<\/strong>High carbon content makes 52100 susceptible to surface carbon loss (decarburization) during austenitizing. Atmosphere-controlled furnaces are mandatory \u2014 air furnaces will produce a soft surface layer that compromises hardness and fatigue life.<\/div><\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-r\">!<\/span><div><strong>Narrow austenitizing temperature window<\/strong>52100 must be austenitized within a narrow range (820\u2013860\u00b0C). Too low = incomplete carbide dissolution and low hardness. Too high = excessive carbide coarsening, reduced fatigue life, and retained austenite.<\/div><\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-r\">!<\/span><div><strong>Sub-zero treatment timing is critical<\/strong>Sub-zero treatment must be performed immediately after quench \u2014 before any retained austenite stabilizes. Delayed sub-zero treatment is less effective. We manage the timing as part of the heat treatment sequence.<\/div><\/div>\n      <\/div>\n      <div class=\"mc-box\">\n        <div class=\"mc-head\"><div class=\"mc-ico mc-ico-blue\">\u2713<\/div>How We Manage These Challenges<\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-b\">\u2713<\/span><div><strong>Grade-specific tooling \u2014 coated carbide with planned intervals<\/strong>PVD-coated carbide inserts with positive rake angles, conservative cutting speeds, and planned tool change intervals prevent late-insert-life degradation from affecting final surfaces.<\/div><\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-b\">\u2713<\/span><div><strong>Atmosphere-controlled heat treatment only<\/strong>All 52100\/GCr15 heat treatment is performed in controlled-atmosphere or vacuum furnaces \u2014 decarburization is eliminated, not inspected for after the fact.<\/div><\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-b\">\u2713<\/span><div><strong>Austenitizing temperature verified, not assumed<\/strong>Furnace temperature calibration records and load thermocouple data retained for each heat treatment batch \u2014 part of the quality record delivered with the order.<\/div><\/div>\n        <div class=\"mc-row\"><span class=\"mc-dot-b\">\u2713<\/span><div><strong>Sub-zero treatment sequenced immediately post-quench<\/strong>Our heat treatment coordination ensures sub-zero processing happens within the required window \u2014 not after the parts sit overnight or travel between facilities.<\/div><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     4. CAPABILITIES\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Manufacturing Capability<\/div>\n        <h2 class=\"h2\">How We Machine <span class=\"blue\">Bearing Steel Parts<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"cap-grid\">\n\n      <div class=\"cap-card\">\n        <div class=\"cc-img\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/CNC-Turning-Service.webp\" alt=\"CNC Turning 52100 GCr15 Annealed\"><\/div>\n        <div class=\"cc-body\">\n          <div class=\"cc-num\">PROCESS \/ 01<\/div>\n          <div class=\"cc-title\">CNC Turning (Annealed)<\/div>\n          <div class=\"cc-desc\">Rough and semi-finish turning of 52100\/GCr15\/SUJ2 in spheroidized-annealed condition. External and internal profiles machined with calculated grinding allowance (0.2\u20130.5 mm per face) on all bearing contact surfaces before heat treatment.<\/div>\n          <div class=\"cc-tags\"><span class=\"cct\">Annealed ~HRC 20<\/span><span class=\"cct\">Grinding Allowance<\/span><span class=\"cct\">Races &amp; Races<\/span><\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"cap-card\">\n        <div class=\"cc-img\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/CNC-Grinding-Service.jpg\" alt=\"Precision Cylindrical Grinding 52100\"><\/div>\n        <div class=\"cc-body\">\n          <div class=\"cc-num\">PROCESS \/ 02<\/div>\n          <div class=\"cc-title\">Precision Cylindrical Grinding<\/div>\n          <div class=\"cc-desc\">OD and ID cylindrical grinding after heat treatment to recover final tolerance. Bearing seat diameters held to \u00b10.002\u20130.005 mm. Roundness (out-of-roundness) controlled to 0.001\u20130.002 mm on precision races and journal surfaces.<\/div>\n          <div class=\"cc-tags\"><span class=\"cct\">\u00b10.002 mm<\/span><span class=\"cct\">OD\/ID Grinding<\/span><span class=\"cct\">Bearing Seats<\/span><\/div>\n        <\/div>\n      <\/div>\n      <div class=\"cap-card\">\n        <div class=\"cc-img\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Rapid-Prototyping-scaled.webp\" alt=\"Prototype to Production Bearing Steel\"><\/div>\n        <div class=\"cc-body\">\n          <div class=\"cc-num\">PROCESS \/ 03<\/div>\n          <div class=\"cc-title\">Prototype to Production<\/div>\n          <div class=\"cc-desc\">Single-piece prototypes through production runs \u2014 the same full heat treatment, sub-zero, and precision grinding sequence runs for all quantities. No minimum order quantity. First-article inspection report available for all orders.<\/div>\n          <div class=\"cc-tags\"><span class=\"cct\">No MOQ<\/span><span class=\"cct\">Full HT Sequence<\/span><span class=\"cct\">FAIR Available<\/span><\/div>\n        <\/div>\n      <\/div>\n\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     COMPARISON TABLE \u2014 52100 vs other bearing-grade steels\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-light\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Material Selection<\/div>\n        <h2 class=\"h2\">52100 vs Other <span class=\"blue\">High-Hardness Steels<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"cmp-table-wrap\">\n      <table class=\"cmp-table\">\n        <thead>\n          <tr>\n            <th>Property<\/th>\n            <th>52100 \/ GCr15<\/th>\n            <th>440C SS<\/th>\n            <th>D2 Tool Steel<\/th>\n            <th>4140 (HT)<\/th>\n            <th>M2 HSS<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td>Max Hardness<\/td>\n            <td><span class=\"badge-ok\">HRC 60\u201364<\/span><\/td>\n            <td>HRC 58\u201360<\/td>\n            <td>HRC 58\u201362<\/td>\n            <td>HRC 34\u201342<\/td>\n            <td>HRC 62\u201365<\/td>\n          <\/tr>\n          <tr>\n            <td>Rolling Contact Fatigue<\/td>\n            <td><span class=\"badge-ok\">\u2605\u2605\u2605\u2605\u2605 Best<\/span><\/td>\n            <td><span class=\"star-blue\">\u2605\u2605\u2605<\/span> Moderate<\/td>\n            <td><span class=\"star-blue\">\u2605\u2605<\/span> Poor<\/td>\n            <td><span class=\"star-blue\">\u2605<\/span> Not rated<\/td>\n            <td><span class=\"star-blue\">\u2605\u2605<\/span> Poor<\/td>\n          <\/tr>\n          <tr>\n            <td>Corrosion Resistance<\/td>\n            <td>Low (non-SS)<\/td>\n            <td><span class=\"badge-ok\">Good (SS)<\/span><\/td>\n            <td>Low<\/td>\n            <td>Low<\/td>\n            <td>Low<\/td>\n          <\/tr>\n          <tr>\n            <td>Machinability (annealed)<\/td>\n            <td><span class=\"star-blue\">\u2605\u2605\u2605<\/span> Moderate<\/td>\n            <td><span class=\"star-blue\">\u2605\u2605\u2605<\/span> Moderate<\/td>\n            <td><span class=\"star-blue\">\u2605\u2605<\/span> Difficult<\/td>\n            <td><span class=\"star-blue\">\u2605\u2605\u2605\u2605<\/span> Good<\/td>\n            <td><span class=\"star-blue\">\u2605\u2605<\/span> Difficult<\/td>\n          <\/tr>\n          <tr>\n            <td>Sub-Zero Treatment<\/td>\n            <td>Required (standard)<\/td>\n            <td>Recommended<\/td>\n            <td>Recommended<\/td>\n            <td>Not typical<\/td>\n            <td>Sometimes<\/td>\n          <\/tr>\n          <tr>\n            <td>Primary Application<\/td>\n            <td>Bearings, ball screws, precision rolling contact<\/td>\n            <td>Bearings (corrosive env.)<\/td>\n            <td>Dies, punches, cutting tools<\/td>\n            <td>Shafts, structural parts<\/td>\n            <td>Cutting tools, drills<\/td>\n          <\/tr>\n          <tr>\n            <td>Choose When<\/td>\n            <td>Maximum rolling contact fatigue life, non-corrosive environment<\/td>\n            <td>Corrosive environment + bearing application<\/td>\n            <td>Sliding wear \/ die application<\/td>\n            <td>Moderate hardness structural parts<\/td>\n            <td>Cutting tool application<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n    <div style=\"margin-top:12px;padding:13px 15px;background:var(--blue-dim);border:1px solid rgba(37,99,235,0.18);border-radius:var(--r2);font-size:13px;color:var(--text-2);line-height:1.65;\">\n      <strong style=\"color:var(--blue);\">Selection rule:<\/strong> For rolling contact fatigue applications (bearings, ball screws, rolling elements) in non-corrosive environments \u2014 52100\/GCr15 is the correct choice. For the same application in marine or chemical environments, specify 440C stainless bearing grade. Never substitute general alloy steel (4140) in rolling contact applications \u2014 the fatigue life difference is orders of magnitude.\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     5. TYPICAL PARTS\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Application Gallery<\/div>\n        <h2 class=\"h2\">Typical Bearing Steel Parts <span class=\"blue\">We Produce<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"parts-grid\">\n\n      <div class=\"part-card\">\n        <div class=\"pc-img\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Bearing-Steel-scaled.jpg\" alt=\"52100 Ball Bearing Inner Outer Race\"><span class=\"pc-badge\">52100 \/ GCr15<\/span><\/div>\n        <div class=\"pc-body\">\n          <div class=\"pc-title\">Bearing Inner &amp; Outer Races<\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Material<\/span><span class=\"pc-v\">52100 \/ GCr15 \u2014 HRC 60\u201362 after Q&T<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Process<\/span><span class=\"pc-v\">CNC Turning \u2192 Q&T + Sub-Zero \u2192 OD\/ID Grinding \u2192 Superfinishing<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Industry<\/span><span class=\"pc-v\">Automotive \u00b7 Industrial \u00b7 Precision Machinery<\/span><\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"part-card\">\n        <div class=\"pc-img\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Ball-Screw-Shafts.webp\" alt=\"GCr15 Ball Screw Nut Shaft\"><span class=\"pc-badge\">GCr15 \/ 52100<\/span><\/div>\n        <div class=\"pc-body\">\n          <div class=\"pc-title\">Ball Screw Shafts &amp; Nuts<\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Material<\/span><span class=\"pc-v\">GCr15 \/ 52100 \u2014 HRC 58\u201362<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Process<\/span><span class=\"pc-v\">CNC Turning \u2192 Q&T + Sub-Zero \u2192 Thread Grinding<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Industry<\/span><span class=\"pc-v\">CNC Machine Tools \u00b7 Robotics \u00b7 Precision Automation<\/span><\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"part-card\">\n        <div class=\"pc-img\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Precision-Valve-Balls-Seats.jpg\" alt=\"52100 Valve Ball High Pressure\"><span class=\"pc-badge\">52100 \/ SUJ2<\/span><\/div>\n        <div class=\"pc-body\">\n          <div class=\"pc-title\">Precision Valve Balls &amp; Seats<\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Material<\/span><span class=\"pc-v\">52100 \/ SUJ2 \u2014 HRC 60\u201364<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Process<\/span><span class=\"pc-v\">CNC Turning \u2192 Q&T \u2192 Lapping to Sphericity &lt;0.001 mm<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Industry<\/span><span class=\"pc-v\">High-Pressure Fluid \u00b7 Hydraulics \u00b7 Check Valves<\/span><\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"part-card\">\n        <div class=\"pc-img\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Cam-Followers.webp\" alt=\"52100 Precision Rollers Cam Followers\"><span class=\"pc-badge\">52100 \/ GCr15<\/span><\/div>\n        <div class=\"pc-body\">\n          <div class=\"pc-title\">Precision Rollers &amp; Cam Followers<\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Material<\/span><span class=\"pc-v\">52100 \/ GCr15 \u2014 HRC 58\u201362<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Process<\/span><span class=\"pc-v\">CNC Turning \u2192 Q&T + Sub-Zero \u2192 Cylindrical Grinding<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Industry<\/span><span class=\"pc-v\">Automation \u00b7 Packaging Machinery \u00b7 Robotics<\/span><\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"part-card\">\n        <div class=\"pc-img\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Punch-Pins-Precision-Die-Inserts.jpg\" alt=\"GCr15 Precision Punch Pin Die Insert\"><span class=\"pc-badge\">GCr15 \/ 52100<\/span><\/div>\n        <div class=\"pc-body\">\n          <div class=\"pc-title\">Punch Pins &amp; Precision Die Inserts<\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Material<\/span><span class=\"pc-v\">GCr15 \/ 52100 \u2014 HRC 60\u201362<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Process<\/span><span class=\"pc-v\">CNC Turning \u2192 Q&T + Sub-Zero \u2192 OD Grinding<\/span><\/div>\n          <div class=\"pc-row\"><span class=\"pc-k\">Industry<\/span><span class=\"pc-v\">Stamping \u00b7 Forming \u00b7 Precision Tooling<\/span><\/div>\n        <\/div>\n      <\/div>\n\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     6. INDUSTRIES\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-light\">\n  <div class=\"wrap\">\n    <div style=\"text-align:center;margin-bottom:40px;\">\n      <div class=\"label\" style=\"justify-content:center;\">Industries Served<\/div>\n      <h2 class=\"h2\">Bearing Steel for <span class=\"blue\">Precision Demanding Applications<\/span><\/h2>\n    <\/div>\n    <div class=\"ind-row\">\n      <div class=\"ind-mini\"><div class=\"im-icon\">\u2699<\/div><div class=\"im-name\">Bearings<\/div><div class=\"im-grade\">52100 \/ GCr15<\/div><\/div>\n      <div class=\"ind-mini\"><div class=\"im-icon\">\u25c8<\/div><div class=\"im-name\">Machine Tools<\/div><div class=\"im-grade\">GCr15 \/ SUJ2<\/div><\/div>\n      <div class=\"ind-mini\"><div class=\"im-icon\">\u25ce<\/div><div class=\"im-name\">Automotive<\/div><div class=\"im-grade\">SUJ2 \/ GCr15<\/div><\/div>\n      <div class=\"ind-mini\"><div class=\"im-icon\">\u2708<\/div><div class=\"im-name\">Aerospace<\/div><div class=\"im-grade\">52100<\/div><\/div>\n      <div class=\"ind-mini\"><div class=\"im-icon\">\ud83d\udd27<\/div><div class=\"im-name\">Hydraulics<\/div><div class=\"im-grade\">52100 \/ GCr15<\/div><\/div>\n      <div class=\"ind-mini\"><div class=\"im-icon\">\u25e7<\/div><div class=\"im-name\">Robotics<\/div><div class=\"im-grade\">GCr15 \/ 52100<\/div><\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     7. CASE STUDIES\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Project Case Studies<\/div>\n        <h2 class=\"h2\">Bearing Steel Projects <span class=\"blue\">We've Delivered<\/span><\/h2>\n      <\/div>\n    <\/div>\n    <div class=\"case-list\">\n\n      <!-- Case 01 -->\n      <div class=\"case-card\">\n        <div class=\"case-inner\">\n          <div class=\"case-imgs\">\n            <div class=\"ci-main\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Bearing-Steel-scaled.jpg\" alt=\"GCr15 Bearing Outer Race Ground\"><\/div>\n            <div class=\"ci-row\">\n              <\/div>\n          <\/div>\n          <div class=\"case-body\">\n            <div class=\"case-num\">CASE \/ 01<\/div>\n            <h3 class=\"case-title\">GCr15 Bearing Outer Race \u2014 Industrial Gearbox Drive Unit<\/h3>\n            <div class=\"case-tags\">\n              <span class=\"tag tag-blue\">GCr15 \/ 52100<\/span>\n              <span class=\"tag\">CNC Turning<\/span>\n              <span class=\"tag\">Q&T + Sub-Zero \u221275\u00b0C<\/span>\n              <span class=\"tag\">OD\/ID Cylindrical Grinding<\/span>\n              <span class=\"tag\">Superfinishing Ra 0.1 \u03bcm<\/span>\n              <span class=\"tag\">Qty 600 pcs<\/span>\n            <\/div>\n            <div class=\"case-row\"><div class=\"cr-k\">Material<\/div><div class=\"cr-v\">GCr15 per GB\/T 18254, vacuum-degassed bar with cleanliness verification report required by customer<\/div><\/div>\n            <div class=\"case-row\"><div class=\"cr-k\">Process<\/div><div class=\"cr-v\">CNC turning (annealed, 0.35 mm grinding stock per surface) \u2192 atmosphere-controlled austenitize 840\u00b0C \u2192 oil quench \u2192 sub-zero \u221275\u00b0C \u2192 temper 160\u00b0C \u2192 OD\/ID cylindrical grinding \u2192 superfinishing Ra 0.1 \u03bcm \u2192 CMM + roundness inspection<\/div><\/div>\n            <div class=\"case-row\"><div class=\"cr-k\">Challenge<\/div><div class=\"cr-v\"><strong>OD \u00d8110 \u22120\/+0.006 mm, ID \u00d872 +0\/\u22120.006 mm, roundness \u22640.003 mm<\/strong> on both bore and OD after heat treatment. Vacuum-degassed material required to meet L10 fatigue life specification. Sub-zero timing controlled within 2 hours of quench completion.<\/div><\/div>\n            <div class=\"case-row\"><div class=\"cr-k\">Outcome<\/div><div class=\"cr-v\">600-piece delivery across 3 batches. All HRC 61\u201363. OD\/ID within \u00b10.004 mm of nominal. Roundness \u22640.002 mm across full batch. Superfinish Ra 0.08 \u03bcm average. Customer's fatigue test bench validated L10 life exceeding specification by 22%.<\/div><\/div>\n            <div class=\"case-outcome\"><strong>Result:<\/strong> L10 fatigue life 22% above specification \u2014 attributed to consistent sub-zero treatment and vacuum-degassed material quality. Customer now specifies our GCr15 supply for all gearbox bearing races in this product family.<\/div>\n            <a href=\"#quote\" class=\"btn btn-ghost btn-sm\">Request Similar Part \u2192<\/a>\n          <\/div>\n        <\/div>\n      <\/div>\n      <!-- Case 02 -->\n      <div class=\"case-card\">\n        <div class=\"case-inner\">\n          <div class=\"case-imgs\">\n            <div class=\"ci-main\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Bearing-Housings-Bores-scaled.webp\" alt=\"GCr15 Precision Valve Ball High Pressure\"><\/div>\n            <div class=\"ci-row\">\n              <\/div>\n          <\/div>\n          <div class=\"case-body\">\n            <div class=\"case-num\">CASE \/ 03<\/div>\n            <h3 class=\"case-title\">GCr15 Precision Valve Ball \u2014 High-Pressure Hydraulic Check Valve \u00b7 5,000 pcs<\/h3>\n            <div class=\"case-tags\">\n              <span class=\"tag tag-blue\">GCr15 \/ 52100<\/span>\n              <span class=\"tag\">CNC Turning<\/span>\n              <span class=\"tag\">Q&T HRC 60\u201362<\/span>\n              <span class=\"tag\">Precision Lapping<\/span>\n              <span class=\"tag\">Sphericity \u22640.0008 mm<\/span>\n              <span class=\"tag\">Qty 5,000 pcs<\/span>\n            <\/div>\n            <div class=\"case-row\"><div class=\"cr-k\">Material<\/div><div class=\"cr-v\">GCr15 bar, standard commercial grade, full mill cert with hardness range verification<\/div><\/div>\n            <div class=\"case-row\"><div class=\"cr-k\">Process<\/div><div class=\"cr-v\">CNC turning (near-net sphere, +0.1 mm) \u2192 Q&T HRC 60\u201362 + sub-zero \u221275\u00b0C \u2192 rough lap \u2192 finish lap (sphericity \u22640.0008 mm, Ra \u22640.05 \u03bcm) \u2192 100% roundness inspection<\/div><\/div>\n            <div class=\"case-row\"><div class=\"cr-k\">Challenge<\/div><div class=\"cr-v\"><strong>Sphericity \u22640.0008 mm on \u00d812 mm ball<\/strong> at HRC 61 \u2014 the lapping sequence must produce a perfect sphere within sub-micron roundness tolerance across 5,000 pieces with consistent process control.<\/div><\/div>\n            <div class=\"case-row\"><div class=\"cr-k\">Outcome<\/div><div class=\"cr-v\">5,000 balls delivered in 4 batches. 100% roundness inspected. Average sphericity 0.0005 mm. HRC 60\u201362 per batch Rockwell test. Zero field seal failures reported over 18 months of high-pressure hydraulic service.<\/div><\/div>\n            <div class=\"case-outcome\"><strong>Result:<\/strong> Previous supplier's GCr15 balls had sphericity ranging to 0.002 mm \u2014 causing intermittent leakage at operating pressure. Our process reduced sphericity by 4\u00d7 and eliminated the leakage issue entirely. Customer now sole-sources all valve balls in this valve family from us.<\/div>\n            <a href=\"#quote\" class=\"btn btn-ghost btn-sm\">Request Similar Part \u2192<\/a>\n          <\/div>\n        <\/div>\n      <\/div>\n\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     8. PROCESS FLOW\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-light\">\n  <div class=\"wrap\">\n    <div style=\"text-align:center;margin-bottom:48px;\">\n      <div class=\"label\" style=\"justify-content:center;\">From Annealed Bar to Precision Ground Part<\/div>\n      <h2 class=\"h2\">How We Produce <span class=\"blue\">Bearing Steel Parts<\/span><\/h2>\n    <\/div>\n    <div class=\"flow-strip\">\n      <div class=\"flow-step\">\n        <div class=\"fs-body\">\n          <div class=\"fs-num\">STEP 01<\/div>\n          <div class=\"fs-title\">Bar Stock Sourcing<\/div>\n          <div class=\"fs-desc\">52100 \/ SUJ2 \/ GCr15 bar sourced in spheroidized-annealed condition with mill cert \u2014 chemistry, cleanliness grade (standard \/ VD \/ ESR) verified per application.<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"flow-step\">\n        <div class=\"fs-body\">\n          <div class=\"fs-num\">STEP 02<\/div>\n          <div class=\"fs-title\">CNC Rough Machining<\/div>\n          <div class=\"fs-desc\">Turning, boring, and milling in annealed condition. Controlled carbide tool wear monitoring. Grinding allowance calculated and left on all precision surfaces.<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"flow-step\">\n        <div class=\"fs-body\">\n          <div class=\"fs-num\">STEP 03<\/div>\n          <div class=\"fs-title\">Heat Treatment + Sub-Zero<\/div>\n          <div class=\"fs-desc\">Atmosphere-controlled austenitize \u2192 oil quench \u2192 immediate sub-zero (\u221275\u00b0C or \u2212196\u00b0C) \u2192 low temper 150\u2013180\u00b0C. Hardness HRC 60\u201364 verified by Rockwell test before proceeding.<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"flow-step\">\n        <div class=\"fs-body\">\n          <div class=\"fs-num\">STEP 04<\/div>\n          <div class=\"fs-title\">Precision Grinding<\/div>\n          <div class=\"fs-desc\">OD\/ID cylindrical grinding to \u00b10.002\u20130.005 mm. Superfinishing to Ra 0.05\u20130.1 \u03bcm on bearing contact surfaces. Roundness verified on all critical bores and journals.<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"flow-step\">\n        <div class=\"fs-body\">\n          <div class=\"fs-num\">STEP 05<\/div>\n          <div class=\"fs-title\">Inspection &amp; Delivery<\/div>\n          <div class=\"fs-desc\">CMM dimensional report, Rockwell hardness test records, furnace cycle charts, surface roughness measurement, and mill cert packed with every order.<\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     9. SURFACE TREATMENTS\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div class=\"sec-head\">\n      <div>\n        <div class=\"label\">Post-Processing<\/div>\n        <h2 class=\"h2\">Surface Treatments for <span class=\"teal\">Bearing Steel Parts<\/span><\/h2>\n      <\/div>\n      <a href=\"\/surface-treatment\/\" class=\"btn btn-ghost btn-sm\">All Finishes \u2192<\/a>\n    <\/div>\n    <p style=\"font-size:14px;color:var(--text-2);line-height:1.75;max-width:720px;margin-bottom:32px;\">Bearing steel (52100 \/ GCr15) is not a stainless steel \u2014 it has no inherent corrosion resistance. Surface treatment is required for parts exposed to moisture or process fluids. Key constraint: high hardness (HRC 60+) limits treatment options \u2014 hydrogen embrittlement risk must be managed for any treatment applied to hardened steel.<\/p>\n    <div class=\"sf-grid\">\n      <div class=\"sf-card\">\n        <div class=\"sf-body\">\n          <div class=\"sf-name\">Black Oxide<\/div>\n          <div class=\"sf-desc\">The most common treatment for hardened bearing steel. Hot caustic blackening provides light corrosion protection with essentially zero dimensional change (&lt;0.001 mm) \u2014 compatible with the tight tolerances on ground bearing components. Standard for bearing races, rollers, and valve balls stored or used in oil-lubricated environments.<\/div>\n          <div class=\"sf-tags\"><span class=\"sft\">~0 Dim. Change<\/span><span class=\"sft\">Light Protection<\/span><span class=\"sft\">No H\u2082 Embrittlement<\/span><\/div>\n        <\/div>\n      <\/div>\n      <div class=\"sf-card\">\n        <div class=\"sf-body\">\n          <div class=\"sf-name\">Phosphate Coating<\/div>\n          <div class=\"sf-desc\">Manganese or zinc phosphate produces a micro-porous surface that holds lubricant \u2014 improving bearing run-in and reducing galling on initial contact. Used on bearing races and precision rollers. Minimal dimensional change, no hydrogen embrittlement risk.<\/div>\n          <div class=\"sf-tags\"><span class=\"sft\">Lubricant Retention<\/span><span class=\"sft\">Run-In Protection<\/span><span class=\"sft\">52100 Compatible<\/span><\/div>\n        <\/div>\n      <\/div>\n      <div class=\"sf-card\">\n        <div class=\"sf-body\">\n          <div class=\"sf-name\">Electroless Nickel<\/div>\n          <div class=\"sf-desc\">Uniform corrosion protection (20\u201350 \u03bcm) for bearing steel parts used in humid or wet environments. Applied carefully \u2014 post-plating bake (190\u00b0C, 4 hours) required to prevent hydrogen embrittlement in HRC 60+ steel. Adds measurable dimensional increase \u2014 must be accounted for in pre-plate grinding.<\/div>\n          <div class=\"sf-tags\"><span class=\"sft\">H\u2082 Bake Required<\/span><span class=\"sft\">Dim. Increase ~25 \u03bcm<\/span><span class=\"sft\">Humid Service<\/span><\/div>\n        <\/div>\n      <\/div>\n      <div class=\"sf-card\">\n        <div class=\"sf-body\">\n          <div class=\"sf-name\">DLC \/ PVD Coating<\/div>\n          <div class=\"sf-desc\">Diamond-Like Carbon (DLC) or TiN\/CrN PVD coatings applied on 52100 bearing surfaces \u2014 adds Hv 2000+ wear layer, reduces friction coefficient to \u03bc &lt;0.1, and improves surface fatigue life on high-speed or marginal lubrication applications. Applied post-grinding at low temperature \u2014 no effect on base steel hardness.<\/div>\n          <div class=\"sf-tags\"><span class=\"sft\">Hv 2000+<\/span><span class=\"sft\">\u03bc &lt;0.1<\/span><span class=\"sft\">No Base HRC Loss<\/span><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- METRICS -->\n<div class=\"metrics\">\n  <div class=\"metric\"><div class=\"metric-val\">HRC 64<\/div><div class=\"metric-lbl\">Max Hardness (52100)<\/div><\/div>\n  <div class=\"metric\"><div class=\"metric-val\">\u00b10.002<span class=\"metric-unit\">mm<\/span><\/div><div class=\"metric-lbl\">Precision Grinding<\/div><\/div>\n  <div class=\"metric\"><div class=\"metric-val\">Ra 0.05<span class=\"metric-unit\">\u03bcm<\/span><\/div><div class=\"metric-lbl\">Superfinish<\/div><\/div>\n  <div class=\"metric\"><div class=\"metric-val\">24<span class=\"metric-unit\">hr<\/span><\/div><div class=\"metric-lbl\">Quote Turnaround<\/div><\/div>\n<\/div>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     10. WHY CHOOSE US\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-white\">\n  <div class=\"wrap\">\n    <div class=\"why-layout\">\n      <div class=\"why-img\">\n  <video controls playsinline>\n    <source src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Why-Choose-Us-for-Bearing-Steel-Machining.mp4\" type=\"video\/mp4\">\n    Your browser does not support the video tag.\n  <\/video>\n<\/div>\n      <div>\n        <div class=\"label\">Why Work With Us<\/div>\n        <h2 class=\"h2\" style=\"margin-bottom:24px;\">Why Choose Us for <span class=\"blue\">Bearing Steel Machining<\/span><\/h2>\n        <div class=\"why-points\">\n          <div class=\"wp-item\">\n            <div class=\"wp-ico\">HT<\/div>\n            <div>\n              <div class=\"wp-title\">Full Heat Treatment + Sub-Zero \u2014 Managed as One Order<\/div>\n              <div class=\"wp-desc\">Atmosphere-controlled austenitizing, oil quench, sub-zero treatment (\u221275\u00b0C or liquid nitrogen \u2212196\u00b0C), and tempering coordinated by us. Hardness HRC 60\u201364 verified before proceeding to grinding \u2014 not assumed.<\/div>\n            <\/div>\n          <\/div>\n          <div class=\"wp-item\">\n            <div class=\"wp-ico\">GR<\/div>\n            <div>\n              <div class=\"wp-title\">Precision Grinding to \u00b10.002 mm \u2014 Post-HT Standard<\/div>\n              <div class=\"wp-desc\">OD and ID cylindrical grinding recovers final tolerance after heat treatment distortion. Roundness and concentricity verified on bearing seats. Superfinishing to Ra 0.05\u20130.1 \u03bcm available for bearing contact surfaces.<\/div>\n            <\/div>\n          <\/div>\n          <div class=\"wp-item\">\n            <div class=\"wp-ico\">MS<\/div>\n            <div>\n              <div class=\"wp-title\">All Three Standards: 52100 \/ SUJ2 \/ GCr15<\/div>\n              <div class=\"wp-desc\">We source and machine all three standard designations \u2014 supply from Japanese JIS-spec SUJ2 stock for Japanese OEM customers, GCr15 from Chinese mills for mainland China supply chains, or ASTM A295 52100 for international specifications.<\/div>\n            <\/div>\n          <\/div>\n          <div class=\"wp-item\">\n            <div class=\"wp-ico\">QC<\/div>\n            <div>\n              <div class=\"wp-title\">Hardness + CMM + Furnace Records \u2014 Delivered with Every Order<\/div>\n              <div class=\"wp-desc\">Rockwell hardness test records (per batch or per part), CMM dimensional report, atmosphere furnace cycle charts, and mill certificate with chemistry verification packed with every delivery. No documentation hunting after the fact.<\/div>\n            <\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     FAQ\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"sec sec-light\">\n  <div class=\"wrap\">\n    <div class=\"faq-layout\">\n      <div>\n        <div class=\"label\">FAQ<\/div>\n        <h2 class=\"h2\">Frequently Asked <span class=\"blue\">Questions<\/span><\/h2>\n        <p style=\"font-size:14px;color:var(--text-2);line-height:1.75;margin-top:16px;\">Common questions about 52100, SUJ2, and GCr15 bearing steel \u2014 grade equivalency, heat treatment, sub-zero processing, precision grinding, and surface finishing.<\/p>\n        <div style=\"margin-top:28px;display:flex;flex-direction:column;gap:10px;\">\n          <a href=\"#quote\" class=\"btn btn-primary btn-sm\">Talk to an Engineer<\/a>\n          <a href=\"\/material\/steel\/\" class=\"btn btn-outline btn-sm\">\u2190 All Steel Grades<\/a>\n          <a href=\"\/material\/stainless-steel\/martensitic\/\" class=\"btn btn-outline btn-sm\">Martensitic SS \u2192<\/a>\n        <\/div>\n      <\/div>\n\n      <div class=\"faq-list\" itemscope itemtype=\"https:\/\/schema.org\/FAQPage\">\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">What is 52100 bearing steel and what makes it suitable for bearing applications?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">AISI 52100 (also known as SUJ2 in Japan and GCr15 in China) is a high-carbon, chromium-alloyed bearing steel specifically engineered for rolling contact fatigue resistance. Its composition \u2014 approximately 1.0% carbon and 1.5% chromium \u2014 produces a fine, uniform distribution of chromium carbides after heat treatment that gives exceptional hardness (HRC 60\u201364), wear resistance, and contact fatigue life. These properties make it the standard material for precision ball bearings, roller bearings, bearing races, precision ball screws, and other components subjected to repeated rolling contact stress.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">What is the difference between 52100, SUJ2, and GCr15 bearing steel?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">52100 (AISI), SUJ2 (JIS G4805), and GCr15 (GB\/T 18254) are national standard designations for essentially the same bearing steel composition \u2014 high carbon (approximately 0.95\u20131.10%), chromium (1.30\u20131.65%), and small additions of manganese and silicon. Minor compositional differences exist between standards, but all three are functionally interchangeable for precision bearing and wear part applications. 52100 is the American designation used internationally; SUJ2 is specified by Japanese OEMs and in JIS supply chains; GCr15 is the Chinese GB standard and is the most commonly stocked grade in mainland China.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">What hardness can 52100 bearing steel achieve after heat treatment?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">52100 bearing steel achieves HRC 60\u201364 after standard quench and temper heat treatment \u2014 significantly harder than 440C stainless (HRC 58\u201360) and comparable to high-speed tool steels. The high hardness combined with fine chromium carbide distribution gives 52100 exceptional rolling contact fatigue life. Sub-zero treatment after quenching converts retained austenite to martensite, further increasing hardness and improving dimensional stability in service.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">How should 52100 bearing steel be machined?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">52100 is typically machined in the annealed or spheroidized-annealed condition (approximately HRC 20\u201325) using conventional CNC turning and milling. After machining, parts are heat-treated to HRC 60\u201364, then precision-ground on all critical surfaces to recover final tolerance after heat treatment distortion. The annealed machinability is similar to medium-carbon alloy steel, though the high carbide content can cause more rapid tool wear than plain carbon steels. Sub-zero treatment is routinely applied after quench before tempering to maximize hardness and dimensional stability.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">What is sub-zero treatment and why is it important for bearing steel?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Sub-zero treatment (also called cryogenic processing) is the cooling of hardened bearing steel to temperatures between \u221275\u00b0C and \u2212196\u00b0C immediately after quenching, before tempering. This low-temperature treatment converts retained austenite \u2014 a softer, metastable phase that remains after quenching \u2014 into martensite, the hard phase that gives bearing steel its properties. Without sub-zero treatment, retained austenite can transform to martensite in service under stress or temperature changes, causing dimensional growth and bearing failure. For precision bearing applications, sub-zero treatment is routinely specified to ensure dimensional stability and maximum hardness.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">What is the difference between bearing steel 52100 and tool steel D2 or H13?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">52100 bearing steel and tool steels (D2, H13) both achieve high hardness, but are engineered for different stress types. 52100 is specifically optimized for rolling contact fatigue \u2014 the repeated hertzian contact stress in bearings \u2014 through its fine, uniformly distributed chromium carbide microstructure and extremely high cleanliness. Tool steels like D2 are optimized for wear resistance in sliding contact and impact. 52100 has higher fatigue life under rolling contact but lower toughness and shock resistance compared to D2. For bearing components and precision rolling elements, 52100\/GCr15 is the correct choice; for dies, punches, and cutting tools, D2 or H13 is more appropriate.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">What tolerances can you hold on precision bearing steel parts after grinding?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">After heat treatment and precision cylindrical grinding, we hold tolerances of \u00b10.002\u20130.005 mm on critical bearing seat diameters and bore dimensions. Roundness (out-of-roundness) can be controlled to 0.001\u20130.002 mm on precision ground bearing races. Surface roughness Ra 0.2\u20130.4 \u03bcm is standard on ground bearing surfaces; Ra 0.05\u20130.1 \u03bcm is achievable with superfinishing. All critical dimensions are CMM-verified before release.<\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n          <button class=\"faq-q\" onclick=\"faq(this)\" itemprop=\"name\">What surface treatments are compatible with 52100 bearing steel?<span class=\"faq-icon\">+<\/span><\/button>\n          <div class=\"faq-a\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Black oxide is the most common surface treatment for 52100 bearing steel parts \u2014 it provides light corrosion protection with essentially zero dimensional change, and is compatible with the hardened surface. Phosphate coating is also used for similar reasons. Hard chrome plating and electroless nickel can be applied for enhanced corrosion protection but must be applied carefully to avoid hydrogen embrittlement in high-hardness steel \u2014 post-plate baking at 190\u00b0C for 4 hours is required. PVD coatings (TiN, DLC) are used on precision bearing components to further reduce friction and improve wear life without affecting base steel hardness.<\/div>\n          <\/div>\n        <\/div>\n\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<script>\nfunction faq(btn){\n  var open=btn.classList.contains('open');\n  document.querySelectorAll('.faq-q').forEach(function(b){b.classList.remove('open');var a=b.nextElementSibling;if(a)a.classList.remove('open');});\n  if(!open){btn.classList.add('open');var a=btn.nextElementSibling;if(a)a.classList.add('open');}\n}\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6d686839 e-con-full quote e-flex e-con e-parent\" data-id=\"6d686839\" data-element_type=\"container\" data-e-type=\"container\" id=\"quote\">\n\t\t<div class=\"elementor-element elementor-element-a9b538e e-con-full e-flex e-con e-child\" data-id=\"a9b538e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-689f32cc elementor-widget elementor-widget-html\" data-id=\"689f32cc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<!-- HXCNC CTA Left Panel | namespace .HXCL | Elementor HTML Widget -->\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Roboto:wght@300;400;500;700;900&family=Roboto+Condensed:wght@400;700;900&family=Roboto+Mono:wght@400;500&display=swap\" rel=\"stylesheet\">\n<style>\n.HXCL{\n  --bg:#F7F9FC;--wh:#FFFFFF;--lt:#EEF3F8;\n  --tx:#1F2937;--tx1:#5B6777;--tx2:#9CA8B4;--bd:#D7E0EA;\n  --a:#2563EB;--a2:#1D4ED8;--aA:rgba(37,99,235,.07);--aC:rgba(37,99,235,.20);\n  --ac:#0F766E;--acA:rgba(15,118,110,.08);--acB:rgba(15,118,110,.15);--acC:rgba(15,118,110,.22);\n  --fh:'Roboto 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Quote.<\/em>\n  <\/h2>\n\n  <p class=\"sub\">Every enquiry includes a DFM review \u2014 tolerance feasibility, material confirmation, and process approach confirmed before production starts. MOQ 1 piece.<\/p>\n\n  <!-- Stats row -->\n  <div class=\"stats\">\n    <div class=\"stat\">\n      <div class=\"sv\">24<small>hr<\/small><\/div>\n      <div class=\"sl\">Quote Response<\/div>\n    <\/div>\n    <div class=\"stat\">\n      <div class=\"sv\">MOQ <small>1<\/small><\/div>\n      <div class=\"sl\">Prototypes OK<\/div>\n    <\/div>\n    <div class=\"stat\">\n      <div class=\"sv\">ISO<\/div>\n      <div class=\"sl\">9001:2015<\/div>\n    <\/div>\n  <\/div>\n\n  <!-- Advantage list -->\n  <div class=\"avlist\">\n    <div class=\"avitem\">\n      <div class=\"ico\">&#128208;<\/div>\n      <div>\n        <div class=\"at\">DFM Review on Every Enquiry<\/div>\n        <div class=\"ad\">Tolerance feasibility, fixturing strategy, and material confirmation. Specific, actionable feedback \u2014 not generic pushback.<\/div>\n      <\/div>\n    <\/div>\n    <div class=\"avitem\">\n      <div class=\"ico\">&#127919;<\/div>\n      <div>\n        <div class=\"at\">First Article Inspection \u2014 Standard<\/div>\n        <div class=\"ad\">FAI report on every new run. Material certs and surface treatment certs included with every shipment.<\/div>\n      <\/div>\n    <\/div>\n    <div class=\"avitem\">\n      <div class=\"ico\">&#128260;<\/div>\n      <div>\n        <div class=\"at\">Same Process: Prototype to Production<\/div>\n        <div class=\"ad\">Process plan from your prototype applies to production batches. No re-qualification when you scale.<\/div>\n      <\/div>\n    <\/div>\n    <div class=\"avitem\">\n      <div class=\"ico\">&#9881;<\/div>\n      <div>\n        <div class=\"at\">3 \/ 4 \/ 5-Axis CNC + Turning<\/div>\n        <div class=\"ad\">Complex structural parts, shafts, housings, and transmission components. Metals and engineering plastics.<\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <!-- Cert tags -->\n  <div class=\"certs\">\n    <span class=\"cert hi\">ISO 9001:2015<\/span>\n    <span class=\"cert\">3\/4\/5-Axis Milling<\/span>\n    <span class=\"cert\">CNC Turning<\/span>\n    <span class=\"cert\">CMM Inspection<\/span>\n    <span class=\"cert\">Global Delivery<\/span>\n  <\/div>\n\n<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2768605f e-con-full e-flex e-con e-child\" data-id=\"2768605f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1875b40f elementor-button-align-stretch elementor-widget elementor-widget-form\" data-id=\"1875b40f\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;step_next_label&quot;:&quot;Next&quot;,&quot;step_previous_label&quot;:&quot;Previous&quot;,&quot;button_width&quot;:&quot;100&quot;,&quot;step_type&quot;:&quot;number_text&quot;,&quot;step_icon_shape&quot;:&quot;circle&quot;}\" data-widget_type=\"form.default\">\n\t\t\t\t\t\t\t<form class=\"elementor-form\" method=\"post\" name=\"New Form\" aria-label=\"New Form\">\n\t\t\t<input type=\"hidden\" name=\"post_id\" value=\"163\"\/>\n\t\t\t<input type=\"hidden\" name=\"form_id\" value=\"1875b40f\"\/>\n\t\t\t<input type=\"hidden\" name=\"referer_title\" value=\"Bearing Steel CNC Machining | 52100 &amp; GCr15 | HXCNC\" \/>\n\n\t\t\t\t\t\t\t<input type=\"hidden\" name=\"queried_id\" value=\"163\"\/>\n\t\t\t\n\t\t\t<div class=\"elementor-form-fields-wrapper elementor-labels-above\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-name elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-name\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tName\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"text\" name=\"form_fields[name]\" id=\"form-field-name\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Name\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-field_12786b6 elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-field_12786b6\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tCompany\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"text\" name=\"form_fields[field_12786b6]\" id=\"form-field-field_12786b6\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Company Name\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-email elementor-field-group elementor-column elementor-field-group-email elementor-col-100 elementor-field-required\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-email\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tEmail\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"email\" name=\"form_fields[email]\" id=\"form-field-email\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Email\" required=\"required\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-select elementor-field-group elementor-column elementor-field-group-field_0c79fc0 elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-field_0c79fc0\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tMaterial\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field elementor-select-wrapper remove-before \">\n\t\t\t<div class=\"select-caret-down-wrapper\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-eicon-caret-down\" viewBox=\"0 0 571.4 571.4\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M571 393Q571 407 561 418L311 668Q300 679 286 679T261 668L11 418Q0 407 0 393T11 368 36 357H536Q550 357 561 368T571 393Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t\t<select name=\"form_fields[field_0c79fc0]\" id=\"form-field-field_0c79fc0\" class=\"elementor-field-textual elementor-size-sm\">\n\t\t\t\t\t\t\t\t\t<option value=\"aluminium_6061_t6\">Aluminium 6061-T6<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"aluminium_7075_t6\">Aluminium 7075-T6<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"stainless_steel_304\">Stainless Steel 304<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"stainless_steel_316l\">Stainless Steel 316L<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"carbon_steel_4140\">Carbon Steel \/ 4140<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"titanium_ti_6al_4v\">Titanium Ti-6Al-4V<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"brass_c360\">Brass C360<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"copper\">Copper<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"peek\">PEEK<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"pom_acetal\">POM \/ Acetal<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"nylon_pa6_pa66\">Nylon PA6 \/ PA66<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"ptfe_teflon\">PTFE \/ Teflon<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"polycarbonate\">Polycarbonate<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"abs\">ABS<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"other_not_sure\">Other \/ Not sure<\/option>\n\t\t\t\t\t\t\t<\/select>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-select elementor-field-group elementor-column elementor-field-group-field_161b5ef elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-field_161b5ef\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tSurface Finish\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field elementor-select-wrapper remove-before \">\n\t\t\t<div class=\"select-caret-down-wrapper\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-eicon-caret-down\" viewBox=\"0 0 571.4 571.4\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M571 393Q571 407 561 418L311 668Q300 679 286 679T261 668L11 418Q0 407 0 393T11 368 36 357H536Q550 357 561 368T571 393Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t\t<select name=\"form_fields[field_161b5ef]\" id=\"form-field-field_161b5ef\" class=\"elementor-field-textual elementor-size-sm\">\n\t\t\t\t\t\t\t\t\t<option value=\"as_machined\">As-machined<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"anodised_type_ii\">Anodised Type II<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"anodised_type_iii_hard\">Anodised Type III (Hard)<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"electroplating\">Electroplating<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"powder_coating\">Powder Coating<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"black_oxide\">Black Oxide<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"passivation_ss\">Passivation (SS)<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"polishing_ra_requirement\">Polishing \/ Ra requirement<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"other_specify_below\">Other (specify below)<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"Select \">Select finish (optional)<\/option>\n\t\t\t\t\t\t\t<\/select>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-textarea elementor-field-group elementor-column elementor-field-group-message elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-message\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tAdditional Requirements\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t<textarea class=\"elementor-field-textual elementor-field  elementor-size-sm\" name=\"form_fields[message]\" id=\"form-field-message\" rows=\"4\" placeholder=\"Target delivery date, critical dimensions, tolerance callouts, inspection requirements, application 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viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256C504 119 393 8 256 8S8 119 8 256s111 248 248 248 248-111 248-248zm-448 0c0-110.5 89.5-200 200-200s200 89.5 200 200-89.5 200-200 200S56 366.5 56 256zm72 20v-40c0-6.6 5.4-12 12-12h116v-67c0-10.7 12.9-16 20.5-8.5l99 99c4.7 4.7 4.7 12.3 0 17l-99 99c-7.6 7.6-20.5 2.2-20.5-8.5v-67H140c-6.6 0-12-5.4-12-12z\"><\/path><\/svg>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Submit Enquiry<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/button>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/form>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Home\/ Materials\/ Steel\/ Bearing Steel \u2014 52100 \/ SUJ2 \/ GCr15 Bearing Steel CNC Machining Bearing SteelCNC Machining 52100 \/ SUJ2 \/ GCr15 HRC 60\u201364 After Q&#038;T Sub-Zero Treatment Precision Grinding \u00b10.002 mm Bearings \u00b7 Ball Screws \u00b7 Wear Parts CNC machining of 52100, SUJ2, and GCr15 high-carbon chromium bearing steel \u2014 the definitive material [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-163","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Bearing Steel CNC Machining | 52100 &amp; GCr15 | HXCNC<\/title>\n<meta name=\"description\" content=\"Precision CNC machining of bearing steel (52100 \/ GCr15). 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