{"id":947,"date":"2026-04-07T12:07:57","date_gmt":"2026-04-07T12:07:57","guid":{"rendered":"https:\/\/hxcnc.com\/?page_id=947"},"modified":"2026-06-09T08:57:52","modified_gmt":"2026-06-09T08:57:52","slug":"internal-ring-gears","status":"publish","type":"page","link":"https:\/\/hxcnc.com\/zh\/product\/internal-ring-gears\/","title":{"rendered":"\u5185\u73af\u9f7f\u8f6e"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"947\" class=\"elementor elementor-947\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3bcd651 e-con-full e-flex e-con e-parent\" data-id=\"3bcd651\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7869ce2 elementor-widget elementor-widget-html\" data-id=\"7869ce2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Syne:wght@400;500;600;700&family=DM+Sans:opsz,wght@9..40,400;9..40,500&family=DM+Mono:wght@400;500&display=swap\" rel=\"stylesheet\">\n<style>\n.hxc-faq-q,\n.hxc-faq-q:hover,\n.hxc-faq-q:focus,\n.hxc-faq-q:active,\n.hxc-faq-q:focus-visible {\n  background: transparent !important;\n  box-shadow: none !important;\n  outline: none !important;\n}\n\n.hxc-faq-q:hover,\n.hxc-faq-q.open {\n  color: var(--primary);\n}\n.hxc-wrap{\n  --bg:#F7F9FC;--card:#FFFFFF;--surface:#EEF3F8;\n  --text:#1F2937;--muted:#5B6777;--border:#D7E0EA;\n  --primary:#2563EB;--hover:#1D4ED8;--accent:#0F766E;\n  --r:8px;--rl:12px;--rx:16px;\n  --hd:'Syne',sans-serif;--bd:'DM Sans',sans-serif;--mn:'DM Mono',monospace;\n  font-family:var(--bd);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;\n}\n.hxc-wrap *{box-sizing:border-box;margin:0;padding:0}\n.hxc-wrap a{color:inherit;text-decoration:none}\n.hxc-wrap img{display:block;width:100%;height:100%;object-fit:cover}\n.hxc-inner{max-width:1200px;margin:0 auto;padding:0 48px}\n.hxc-s    {padding:80px 0;background:var(--bg)}\n.hxc-s-sf {padding:80px 0;background:var(--surface);border-top:0.5px solid var(--border);border-bottom:0.5px solid var(--border)}\n.hxc-s-cd {padding:80px 0;background:var(--card);border-bottom:0.5px solid var(--border)}\n.hxc-ey{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);background:#E0F2EE;padding:4px 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rgba(37,99,235,.28)}\n.hxc-o{background:transparent;color:var(--primary);border-color:var(--primary)}\n.hxc-o:hover{background:#EFF6FF}\n.hxc-w{background:#fff;color:var(--primary);border-color:#fff}\n.hxc-w:hover{background:#EFF6FF;transform:translateY(-1px)}\n.hxc-g{background:transparent;color:#fff;border-color:rgba(255,255,255,.5)}\n.hxc-g:hover{border-color:#fff;background:rgba(255,255,255,.1)}\n.hxc-ar{transition:transform .2s}.hxc-btn:hover .hxc-ar{transform:translateX(3px)}\n\/* HERO *\/\n.hxc-hero{background:var(--surface);border-bottom:0.5px solid var(--border);overflow:hidden;width:100%}\n.hxc-hg{display:grid;grid-template-columns:1fr 1.05fr;min-height:580px;width:100%}\n.hxc-hl{padding:72px 48px;display:flex;flex-direction:column;justify-content:center;border-right:0.5px solid var(--border)}\n.hxc-badge{display:inline-flex;align-items:center;gap:7px;background:#fff;border:0.5px solid var(--border);border-radius:20px;padding:5px 14px 5px 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img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}\n.hxc-sb{position:absolute;bottom:0;left:0;right:0;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-top:0.5px solid var(--border);display:flex}\n.hxc-sc{flex:1;padding:14px 16px;text-align:center;border-right:0.5px solid var(--border)}\n.hxc-sc:last-child{border-right:none}\n.hxc-sv{font-family:var(--mn);font-size:14px;font-weight:500;color:var(--accent);line-height:1}\n.hxc-sl{font-size:11px;color:var(--muted);margin-top:4px}\n\/* STATS *\/\n.hxc-stats{background:var(--card);border-bottom:0.5px solid var(--border)}\n.hxc-sg{max-width:1200px;margin:0 auto;padding:0 48px;display:grid;grid-template-columns:repeat(4,1fr)}\n.hxc-st{padding:28px 20px;text-align:center;border-right:0.5px solid var(--border)}\n.hxc-st:last-child{border-right:none}\n.hxc-sn{font-family:var(--mn);font-size:26px;font-weight:500;color:var(--accent);line-height:1}\n.hxc-sl2{font-size:12px;color:var(--muted);margin-top:6px;line-height:1.4}\n\/* GALLERY *\/\n.hxc-gh{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:32px;gap:20px;flex-wrap:wrap}\n.hxc-gg{display:grid;grid-template-columns:repeat(12,1fr);grid-auto-rows:auto;gap:8px}\n.hxc-gc{position:relative;overflow:hidden;border-radius:var(--rl);background:var(--surface);cursor:pointer}\n.hxc-gc img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .45s ease}\n.hxc-gc:hover img{transform:scale(1.05)}\n.hxc-gov{position:absolute;inset:0;background:linear-gradient(to top,rgba(15,25,60,.72) 0%,transparent 55%);display:flex;flex-direction:column;justify-content:flex-end;padding:14px;opacity:0;transition:opacity .3s}\n.hxc-gc:hover .hxc-gov{opacity:1}\n.hxc-gn{font-family:var(--hd);font-size:13px;font-weight:600;color:#fff;line-height:1.3;margin-bottom:2px}\n.hxc-gm{font-size:10px;color:rgba(255,255,255,.72);font-family:var(--mn)}\n.hxc-gtag{position:absolute;top:10px;left:10px;background:rgba(255,255,255,.92);border-radius:4px;padding:3px 8px;font-size:10px;font-weight:600;color:var(--accent);font-family:var(--mn)}\n.hxc-a{grid-column:span 5;min-height:340px}.hxc-b{grid-column:span 4;min-height:164px}.hxc-c{grid-column:span 3;min-height:164px}\n.hxc-d{grid-column:span 3;min-height:164px}.hxc-e{grid-column:span 4;min-height:164px}.hxc-f{grid-column:span 5;min-height:164px}\n.hxc-gg7{grid-column:span 4;min-height:164px}.hxc-gg8{grid-column:span 3;min-height:164px}\n\/* CAPABILITIES *\/\n.hxc-cw{background:var(--card);border:0.5px solid var(--border);border-radius:var(--rx);overflow:hidden;display:grid;grid-template-columns:230px 1fr}\n.hxc-csb{border-right:0.5px solid var(--border);padding:8px 0}\n.hxc-ct{display:flex;align-items:center;gap:12px;padding:14px 16px;cursor:pointer;transition:all .2s;border-left:3px solid transparent;font-size:13px;color:var(--muted)}\n.hxc-ct:hover{background:#fafbfc;color:var(--text)}\n.hxc-ct.on{background:var(--surface);color:var(--primary);font-weight:500;border-left-color:var(--primary)}\n.hxc-ci{width:34px;height:34px;border-radius:var(--r);background:var(--surface);display:flex;align-items:center;justify-content:center;font-size:15px;flex-shrink:0}\n.hxc-ct.on .hxc-ci{background:#DBEAFE}\n.hxc-cb{display:none;animation:hxc-fi .2s ease}\n.hxc-cb.on{display:grid;grid-template-columns:1fr 280px}\n@keyframes hxc-fi{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:none}}\n.hxc-ctx{padding:26px 28px;border-right:0.5px solid var(--border)}\n.hxc-cttl{font-family:var(--hd);font-size:17px;font-weight:600;margin-bottom:7px}\n.hxc-cdesc{font-size:13px;color:var(--muted);line-height:1.75;margin-bottom:18px}\n.hxc-tbl{width:100%;border-collapse:collapse}\n.hxc-tbl tr{border-bottom:0.5px solid var(--border)}\n.hxc-tbl tr:last-child{border-bottom:none}\n.hxc-tbl td{padding:9px 0;font-size:12px;vertical-align:middle}\n.hxc-tbl td:first-child{color:var(--muted);width:150px}\n.hxc-tbl td:last-child{font-family:var(--mn);font-weight:500;font-size:12px}\n.hxc-hi{background:#E0F2EE;color:var(--accent);border-radius:3px;padding:1px 6px;font-size:11px;font-weight:600;font-family:var(--mn)}\n.hxc-cimg{overflow:hidden;position:relative}\n.hxc-cimg img{width:100%;height:100%;object-fit:cover;min-height:320px}\n\/* MATERIALS *\/\n.hxc-mts{display:flex;border:0.5px solid var(--border);border-radius:var(--r);overflow:hidden;width:fit-content;margin-bottom:28px}\n.hxc-mtt{padding:9px 22px;font-size:13px;font-weight:500;color:var(--muted);cursor:pointer;background:var(--card);transition:all .2s;border-right:0.5px solid var(--border)}\n.hxc-mtt:last-child{border-right:none}\n.hxc-mtt.on{background:var(--primary);color:#fff}\n.hxc-mg{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:14px}\n.hxc-mc{background:var(--card);border:0.5px solid var(--border);border-radius:var(--rl);overflow:hidden;cursor:pointer;transition:all .25s}\n.hxc-mc:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:0 6px 20px rgba(37,99,235,.1)}\n.hxc-mci{height:128px;overflow:hidden}\n.hxc-mci img{width:100%;height:100%;object-fit:cover;transition:transform .35s}\n.hxc-mc:hover .hxc-mci img{transform:scale(1.07)}\n.hxc-mif{padding:13px 15px}\n.hxc-mn{font-size:13px;font-weight:500;margin-bottom:5px}\n.hxc-mp{font-size:11px;color:var(--muted);line-height:1.5;margin-bottom:9px}\n.hxc-mtgs{display:flex;gap:4px;flex-wrap:wrap}\n.hxc-mtg{font-size:10px;font-weight:600;padding:2px 6px;border-radius:3px;background:var(--surface);color:var(--muted)}\n\/* SURFACE *\/\n.hxc-trg{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}\n.hxc-trc{background:var(--card);border:0.5px solid var(--border);border-radius:var(--rl);overflow:hidden;transition:all .25s}\n.hxc-trc:hover{border-color:var(--accent);box-shadow:0 4px 16px rgba(15,118,110,.08);transform:translateY(-2px)}\n.hxc-tri{height:150px;overflow:hidden}\n.hxc-tri img{width:100%;height:100%;object-fit:cover;transition:transform .35s}\n.hxc-trc:hover .hxc-tri img{transform:scale(1.05)}\n.hxc-trb{padding:16px}\n.hxc-trn{font-family:var(--hd);font-size:14px;font-weight:600;margin-bottom:5px}\n.hxc-trd{font-size:12px;color:var(--muted);line-height:1.6;margin-bottom:8px}\n.hxc-trbg{font-size:10px;font-weight:600;color:var(--accent);background:#E0F2EE;padding:2px 8px;border-radius:3px;display:inline-block}\n\/* PROCESS *\/\n.hxc-psg{display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:relative;margin-top:52px}\n.hxc-psg::before{content:'';position:absolute;top:27px;left:calc(12.5% + 20px);right:calc(12.5% + 20px);height:1px;background:repeating-linear-gradient(90deg,var(--primary) 0,var(--primary) 6px,transparent 6px,transparent 14px);z-index:0}\n.hxc-ps{display:flex;flex-direction:column;align-items:center;text-align:center;padding:0 12px;position:relative;z-index:1}\n.hxc-psn{width:54px;height:54px;border-radius:50%;background:var(--primary);color:#fff;font-family:var(--mn);font-size:15px;font-weight:500;display:flex;align-items:center;justify-content:center;margin-bottom:16px;box-shadow:0 0 0 6px var(--surface),0 0 0 7px var(--border)}\n.hxc-pst{font-family:var(--hd);font-size:14px;font-weight:600;margin-bottom:7px}\n.hxc-psd{font-size:12px;color:var(--muted);line-height:1.65;max-width:180px}\n\/* QUALITY *\/\n.hxc-qg{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}\n.hxc-qc{display:flex;align-items:center;gap:14px;background:var(--card);border:0.5px solid var(--border);border-radius:var(--rl);padding:14px 16px;margin-bottom:10px}\n.hxc-qci{width:42px;height:42px;border-radius:var(--r);background:#E0F2EE;color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}\n.hxc-qcn{font-size:13px;font-weight:500;margin-bottom:2px}\n.hxc-qcd{font-size:11px;color:var(--muted)}\n.hxc-qs{display:flex;gap:14px;padding:16px 0;border-bottom:0.5px solid var(--border)}\n.hxc-qs:last-child{border-bottom:none}\n.hxc-qsn{width:28px;height:28px;border-radius:50%;background:var(--primary);color:#fff;font-size:11px;font-weight:600;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px;font-family:var(--mn)}\n.hxc-qst{font-size:13px;font-weight:500;margin-bottom:3px}\n.hxc-qsd{font-size:12px;color:var(--muted);line-height:1.6}\n\/* CASES *\/\n.hxc-casg{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}\n.hxc-casc{background:var(--card);border:0.5px solid var(--border);border-radius:var(--rx);overflow:hidden;transition:all .25s}\n.hxc-casc:hover{transform:translateY(-3px);box-shadow:0 8px 28px rgba(37,99,235,.1);border-color:var(--primary)}\n.hxc-casi{height:210px;position:relative;overflow:hidden}\n.hxc-casi img{width:100%;height:100%;object-fit:cover;transition:transform .4s}\n.hxc-casc:hover .hxc-casi img{transform:scale(1.05)}\n.hxc-casl{position:absolute;top:12px;left:12px;background:var(--primary);color:#fff;font-size:10px;font-weight:600;padding:3px 9px;border-radius:4px;font-family:var(--mn)}\n.hxc-casb{padding:18px 20px}\n.hxc-cast{font-family:var(--hd);font-size:15px;font-weight:600;margin-bottom:10px}\n.hxc-casm{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:12px}\n.hxc-kv{background:var(--surface);border-radius:var(--r);padding:8px 10px}\n.hxc-k{font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:2px}\n.hxc-v{font-size:12px;font-weight:500;font-family:var(--mn)}\n.hxc-casr{font-size:12px;color:var(--accent);font-weight:500;border-top:0.5px solid var(--border);padding-top:10px}\n\/* APPS *\/\n.hxc-apg{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}\n.hxc-apc{background:var(--card);border:0.5px solid var(--border);border-radius:var(--rl);overflow:hidden;transition:all .25s}\n.hxc-apc:hover{border-color:var(--primary);transform:translateY(-2px)}\n.hxc-api{height:130px;overflow:hidden}\n.hxc-api img{width:100%;height:100%;object-fit:cover;transition:transform .35s}\n.hxc-apc:hover .hxc-api img{transform:scale(1.06)}\n.hxc-apb{padding:14px 16px}\n.hxc-apt{font-family:var(--hd);font-size:13px;font-weight:600;margin-bottom:5px}\n.hxc-apd{font-size:12px;color:var(--muted);line-height:1.55}\n\/* TESTI *\/\n.hxc-tsg{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}\n.hxc-tsi{background:var(--card);border:0.5px solid var(--border);border-radius:var(--rl);padding:22px;display:flex;flex-direction:column;gap:12px}\n.hxc-tss{color:#F59E0B;font-size:13px;letter-spacing:2px}\n.hxc-tst{font-size:13px;color:var(--muted);line-height:1.75;flex:1}\n.hxc-tshr{border-top:0.5px solid var(--border)}\n.hxc-tsau{display:flex;align-items:center;gap:10px}\n.hxc-tsav{width:36px;height:36px;border-radius:50%;background:var(--surface);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;color:var(--primary);flex-shrink:0}\n.hxc-tsnm{font-size:12px;font-weight:500}\n.hxc-tsco{font-size:11px;color:var(--muted)}\n\/* FAQ *\/\n.hxc-faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 32px;align-items:start}\n.hxc-faq-item{border-bottom:0.5px solid var(--border)}\n.hxc-faq-q{width:100%;background:none;border:none;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 0;font-family:var(--bd);font-size:14px;font-weight:500;color:var(--text);cursor:pointer;text-align:left;transition:color .2s}\n.hxc-faq-q:hover,.hxc-faq-q.open{color:var(--primary)}\n.hxc-faq-icon{width:22px;height:22px;border-radius:50%;background:var(--surface);border:0.5px solid var(--border);display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:14px;line-height:1;transition:all .25s;color:var(--muted)}\n.hxc-faq-q.open .hxc-faq-icon{background:var(--primary);border-color:var(--primary);color:#fff;transform:rotate(45deg)}\n.hxc-faq-body{display:none;padding:0 0 18px;font-size:13px;color:var(--muted);line-height:1.75}\n.hxc-faq-body.open{display:block;animation:hxc-faq-in .2s ease}\n@keyframes hxc-faq-in{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}\n.hxc-faq-body strong{color:var(--text);font-weight:500}\n\/* CTA *\/\n.hxc-cta{background:var(--primary);padding:80px 48px;text-align:center;position:relative;overflow:hidden}\n.hxc-cta::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 25% 50%,rgba(255,255,255,.07),transparent 60%),radial-gradient(ellipse at 75% 50%,rgba(255,255,255,.05),transparent 60%)}\n.hxc-cta>*{position:relative;z-index:1}\n.hxc-ctat{font-family:var(--hd);font-size:clamp(24px,3vw,36px);font-weight:700;color:#fff;line-height:1.2;margin-bottom:12px}\n.hxc-ctasb{font-size:15px;color:rgba(255,255,255,.72);margin-bottom:32px;max-width:460px;line-height:1.7}\n.hxc-ctabs{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}\n.hxc-ctan{margin-top:16px;font-size:12px;color:rgba(255,255,255,.45);font-family:var(--mn)}\n\/* REVEAL *\/\n.hxc-rv{opacity:0;transform:translateY(18px);transition:opacity .5s ease,transform .5s ease}\n.hxc-rv.in{opacity:1;transform:none}\n\/* RESPONSIVE *\/\n@media(max-width:1024px){\n  .hxc-inner{padding:0 32px}.hxc-sg{padding:0 32px}\n  .hxc-hg{grid-template-columns:1fr;min-height:auto}.hxc-hr{height:360px}\n  .hxc-hl{padding:56px 32px;border-right:none}\n  .hxc-cw{grid-template-columns:1fr}.hxc-cb.on{grid-template-columns:1fr}.hxc-cimg{display:none}\n  .hxc-gg{grid-template-columns:repeat(6,1fr)}\n  .hxc-a{grid-column:span 4;min-height:260px}\n  .hxc-b,.hxc-c,.hxc-d,.hxc-e,.hxc-f,.hxc-gg7,.hxc-gg8{grid-column:span 3;min-height:150px}\n  .hxc-qg,.hxc-casg{grid-template-columns:1fr}.hxc-trg{grid-template-columns:repeat(2,1fr)}\n}\n@media(max-width:768px){\n  .hxc-inner{padding:0 20px}.hxc-sg{padding:0 20px}\n  .hxc-s,.hxc-s-sf,.hxc-s-cd{padding:52px 0}.hxc-hl{padding:48px 20px}\n  .hxc-gg{grid-template-columns:1fr 1fr;gap:6px}\n  .hxc-a,.hxc-b,.hxc-c,.hxc-d,.hxc-e,.hxc-f,.hxc-gg7,.hxc-gg8{grid-column:span 2;min-height:150px}\n  .hxc-sg{grid-template-columns:repeat(2,1fr)}\n  .hxc-st:nth-child(2){border-right:none}.hxc-st:nth-child(3){border-right:0.5px solid var(--border)}\n  .hxc-apg,.hxc-tsg{grid-template-columns:1fr 1fr}\n  .hxc-psg{grid-template-columns:1fr 1fr;gap:32px}.hxc-psg::before{display:none}\n  .hxc-mg{grid-template-columns:1fr 1fr}.hxc-trg{grid-template-columns:1fr}\n  .hxc-faq-grid{grid-template-columns:1fr;gap:0}\n  .hxc-csb{display:flex;overflow-x:auto;border-right:none;border-bottom:0.5px solid var(--border)}\n  .hxc-ct{border-left:none;border-bottom:3px solid transparent;white-space:nowrap}\n  .hxc-ct.on{border-left:none;border-bottom-color:var(--primary);background:var(--surface)}\n  .hxc-cta{padding:56px 20px}\n}\n@media(max-width:480px){\n  .hxc-h1{font-size:30px}\n  .hxc-hbtns,.hxc-ctabs{flex-direction:column;align-items:stretch}\n  .hxc-btn{justify-content:center;width:100%}\n  .hxc-apg,.hxc-tsg,.hxc-mg{grid-template-columns:1fr}\n  .hxc-casg,.hxc-trg{grid-template-columns:1fr}\n}\n<\/style>\n\n<div class=\"hxc-wrap\">\n\n<!-- \u2550\u2550\u2550 HERO \u2550\u2550\u2550 -->\n<div class=\"hxc-hero\">\n  <div class=\"hxc-hg\">\n    <div class=\"hxc-hl\">\n      <div class=\"hxc-badge\"><span class=\"hxc-dot\"><\/span>Internal gear ring manufacturer &amp; factory \u00b7 Made in China \u00b7 Ships worldwide<\/div>\n      <h1 class=\"hxc-h1\">Custom <em>Internal Ring Gears<\/em><br>Precision CNC Machined<\/h1>\n      <p class=\"hxc-hdesc\">High-accuracy internal ring gears \u2014 also called annulus gears or internal gear rings \u2014 for planetary gearboxes, differential drives, and actuator systems. Internal spur, internal helical, metal and plastic profiles. Bore sizes from 30 mm to 1,200 mm including standard 300 mm internal ring gears. DIN 5\u20139 quality, customized quotation in 48 hours, every piece CMM-inspected.<\/p>\n      <div class=\"hxc-hbtns\">\n        <a href=\"#hxc-cta\" class=\"hxc-btn hxc-p\">Get Customized Quotation <span class=\"hxc-ar\">\u2192<\/span><\/a>\n        <a href=\"#hxc-gal\" class=\"hxc-btn hxc-o\">View Our Work<\/a>\n      <\/div>\n      <div class=\"hxc-chips\">\n        <span class=\"hxc-chip\"><span class=\"hxc-ck\">\u2713<\/span> ISO 9001:2015<\/span>\n        <span class=\"hxc-chip\"><span class=\"hxc-ck\">\u2713<\/span> MOQ 1 pc<\/span>\n        <span class=\"hxc-chip\"><span class=\"hxc-ck\">\u2713<\/span> 48h Quotation<\/span>\n        <span class=\"hxc-chip\"><span class=\"hxc-ck\">\u2713<\/span> DIN 5\u20139<\/span>\n        <span class=\"hxc-chip\"><span class=\"hxc-ck\">\u2713<\/span> Spur \u00b7 Helical \u00b7 Plastic<\/span>\n      <\/div>\n    <\/div>\n    <div class=\"hxc-hr\">\n      <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Planet-Gear-Carriers-scaled.webp\"\n           onerror=\"this.src='https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Planet-Gear-Carriers-scaled.webp'\"\n           alt=\"Precision CNC machined internal ring gear annulus gear planetary gearbox\">\n      <div class=\"hxc-sb\">\n        <div class=\"hxc-sc\"><div class=\"hxc-sv\">\u00b10.005mm<\/div><div class=\"hxc-sl\">Profile tolerance<\/div><\/div>\n        <div class=\"hxc-sc\"><div class=\"hxc-sv\">\u00d830\u20131200mm<\/div><div class=\"hxc-sl\">Bore size range<\/div><\/div>\n        <div class=\"hxc-sc\"><div class=\"hxc-sv\">M 0.5\u201316<\/div><div class=\"hxc-sl\">Module range<\/div><\/div>\n        <div class=\"hxc-sc\"><div class=\"hxc-sv\">DIN 5\u20139<\/div><div class=\"hxc-sl\">Quality grade<\/div><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- \u2550\u2550\u2550 STATS \u2550\u2550\u2550 -->\n<div class=\"hxc-stats\">\n  <div class=\"hxc-sg\">\n    <div class=\"hxc-st\"><div class=\"hxc-sn\">\u00b10.005mm<\/div><div class=\"hxc-sl2\">Profile Tolerance<br>DIN grade 5 achievable<\/div><\/div>\n    <div class=\"hxc-st\"><div class=\"hxc-sn\">\u00d830\u20131200mm<\/div><div class=\"hxc-sl2\">Bore Diameter Range<br>incl. standard 300mm class<\/div><\/div>\n    <div class=\"hxc-st\"><div class=\"hxc-sn\">5 Days<\/div><div class=\"hxc-sl2\">Fastest Lead Time<br>prototype orders<\/div><\/div>\n    <div class=\"hxc-st\"><div class=\"hxc-sn\">1\u201310,000<\/div><div class=\"hxc-sl2\">Order Quantity<br>prototype to production<\/div><\/div>\n  <\/div>\n<\/div>\n\n<!-- \u2550\u2550\u2550 GALLERY \u2550\u2550\u2550 -->\n<div class=\"hxc-s-cd\" id=\"hxc-gal\">\n  <div class=\"hxc-inner\">\n    <div class=\"hxc-gh\">\n      <div>\n        <span class=\"hxc-ey\">Our Work<\/span>\n        <h2 class=\"hxc-h2\">Internal Ring Gears We've Made<\/h2>\n        <p class=\"hxc-sub\">Real internal gear ring orders \u2014 planetary annulus gears, differential ring gears, internal helical ring gears, plastic ring gears \u2014 shipped from our China factory to customers in automotive, robotics, and industrial sectors.<\/p>\n      <\/div>\n      <a href=\"#hxc-cta\" class=\"hxc-btn hxc-o\" style=\"flex-shrink:0\">Request Customized Quotation <span class=\"hxc-ar\">\u2192<\/span><\/a>\n    <\/div>\n    <div class=\"hxc-gg\">\n      <div class=\"hxc-gc hxc-a\">\n        <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Internal-Ring-Gears1.webp\" alt=\"steel internal ring gear planetary gearbox annulus CNC hobbed\">\n      <\/div>\n      <div class=\"hxc-gc hxc-b\">\n        <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Internal-Ring-Gears3.webp\" alt=\"internal helical ring gear annulus gear reducer precision machined\">\n      <\/div>\n      <div class=\"hxc-gc hxc-c\">\n        <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Internal-Ring-Gears4.jpeg\" alt=\"300mm internal ring gear china manufacturer automotive differential\">\n      <\/div>\n      <div class=\"hxc-gc hxc-d\">\n        <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Internal-Ring-Gears5.png\" alt=\"stainless steel internal gear ring medical robot precision\">\n      <\/div>\n      <div class=\"hxc-gc hxc-e\">\n        <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Internal-Ring-Gears6.webp\" alt=\"aluminum internal ring gear lightweight aerospace robot arm\">\n      <\/div>\n      <div class=\"hxc-gc hxc-f\">\n        <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Internal-Ring-Gears7.jpeg\" alt=\"large internal gear ring made in china wind turbine industrial gearbox\">\n      <\/div>\n      <div class=\"hxc-gc hxc-gg7\">\n        <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Internal-Ring-Gears2.jpg\" alt=\"plastic internal ring gear POM nylon instrument drive low noise\">\n      <\/div>\n      <div class=\"hxc-gc hxc-gg8\">\n        <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Internal-Ring-Gears.webp\" alt=\"CMM inspection internal ring gear china factory quality check\">\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- \u2550\u2550\u2550 CAPABILITIES \u2550\u2550\u2550 -->\n<div class=\"hxc-s\" id=\"hxc-cap\">\n  <div class=\"hxc-inner\">\n    <span class=\"hxc-ey\">Technical Specs<\/span>\n    <h2 class=\"hxc-h2\">Internal Ring Gear Machining Capabilities<\/h2>\n    <p class=\"hxc-sub\" style=\"margin-bottom:36px\">Four dedicated processes for internal gear cutting \u2014 from high-volume internal gear hobbing to precision internal profile grinding and 5-axis milling for complex ring gear housings. Every process available for customized internal gear ring production.<\/p>\n    <div class=\"hxc-cw\">\n      <div class=\"hxc-csb\">\n        <div class=\"hxc-ct on\" onclick=\"hxcCap(this,'hxc-c1')\"><div class=\"hxc-ci\">\u2699\ufe0f<\/div><div><div style=\"font-size:13px;font-weight:500\">Internal Gear Hobbing<\/div><div style=\"font-size:11px;color:var(--muted);margin-top:1px\">High-volume production<\/div><\/div><\/div>\n        <div class=\"hxc-ct\" onclick=\"hxcCap(this,'hxc-c2')\"><div class=\"hxc-ci\">\ud83d\udd2c<\/div><div><div style=\"font-size:13px;font-weight:500\">Internal Gear Grinding<\/div><div style=\"font-size:11px;color:var(--muted);margin-top:1px\">DIN 5\u20136 precision<\/div><\/div><\/div>\n        <div class=\"hxc-ct\" onclick=\"hxcCap(this,'hxc-c3')\"><div class=\"hxc-ci\">\ud83c\udfed<\/div><div><div style=\"font-size:13px;font-weight:500\">Broaching &amp; Shaping<\/div><div style=\"font-size:11px;color:var(--muted);margin-top:1px\">Thin-wall ring gears<\/div><\/div><\/div>\n        <div class=\"hxc-ct\" onclick=\"hxcCap(this,'hxc-c4')\"><div class=\"hxc-ci\">\ud83d\udd27<\/div><div><div style=\"font-size:13px;font-weight:500\">5-Axis Milling<\/div><div style=\"font-size:11px;color:var(--muted);margin-top:1px\">Complex ring housings<\/div><\/div><\/div>\n      <\/div>\n      <div class=\"hxc-cb on\" id=\"hxc-c1\">\n        <div class=\"hxc-ctx\">\n          <div class=\"hxc-cttl\">Internal Gear Hobbing<\/div>\n          <div class=\"hxc-cdesc\">CNC internal gear hobbing using shaped hob heads generates precise internal tooth profiles at high production rates. Ideal for planetary ring gears (annulus gears), internal spur ring gears, and internal helical ring gears in factory batch quantities.<\/div>\n          <table class=\"hxc-tbl\">\n            <tr><td>Module range<\/td><td>0.8 \u2013 12 mm<\/td><\/tr>\n            <tr><td>Bore diameter<\/td><td>\u00d850 \u2013 800 mm (incl. 300 mm class)<\/td><\/tr>\n            <tr><td>Max face width<\/td><td>200 mm<\/td><\/tr>\n            <tr><td>Quality grade<\/td><td>DIN 7\u20139 <span class=\"hxc-hi\">standard<\/span><\/td><\/tr>\n            <tr><td>Profile tolerance<\/td><td>\u00b10.012 mm<\/td><\/tr>\n            <tr><td>Internal helical<\/td><td>Yes \u2014 up to 30\u00b0 helix<\/td><\/tr>\n            <tr><td>Typical quantity<\/td><td>50 \u2013 10,000 pcs<\/td><\/tr>\n            <tr><td>Lead time<\/td><td>8 \u2013 16 days<\/td><\/tr>\n          <\/table>\n        <\/div>\n      <\/div>\n      <div class=\"hxc-cb\" id=\"hxc-c2\">\n        <div class=\"hxc-ctx\">\n          <div class=\"hxc-cttl\">Internal Gear Profile Grinding<\/div>\n          <div class=\"hxc-cdesc\">Post-hobbing or post-hardening internal gear grinding for planetary ring gears requiring DIN 5\u20136 accuracy. Uses shaped grinding wheels to reach internal tooth flanks. Critical for high-load planetary gearboxes and precision actuator ring gears \u2014 a capability most internal gear ring suppliers outsource. We do it in-house.<\/div>\n          <table class=\"hxc-tbl\">\n            <tr><td>Module range<\/td><td>0.5 \u2013 8 mm<\/td><\/tr>\n            <tr><td>Bore diameter<\/td><td>\u00d840 \u2013 400 mm<\/td><\/tr>\n            <tr><td>Quality grade<\/td><td>DIN 5\u20136 <span class=\"hxc-hi\">precision<\/span><\/td><\/tr>\n            <tr><td>Profile tolerance<\/td><td>\u00b10.005 mm<\/td><\/tr>\n            <tr><td>Surface finish Ra<\/td><td>0.4 \u2013 0.8 \u00b5m<\/td><\/tr>\n            <tr><td>Post heat treatment<\/td><td>Yes \u2014 hardened ring gear grinding<\/td><\/tr>\n            <tr><td>Lead time<\/td><td>12 \u2013 20 days<\/td><\/tr>\n            <tr><td>Materials<\/td><td>20CrMnTi, 42CrMo4, M2<\/td><\/tr>\n          <\/table>\n        <\/div>\n      <\/div>\n      <div class=\"hxc-cb\" id=\"hxc-c3\">\n        <div class=\"hxc-ctx\">\n          <div class=\"hxc-cttl\">Gear Shaping &amp; Broaching<\/div>\n          <div class=\"hxc-cdesc\">Gear shaping (reciprocating cutter) is ideal for internal ring gears with thin walls, blind bores, or shoulder-interrupted teeth where hobbing tools cannot enter. Broaching is used for short internal gear lengths requiring high production rates. Shaping is also the standard process for plastic internal ring gears (POM, nylon, PEEK).<\/div>\n          <table class=\"hxc-tbl\">\n            <tr><td>Module range<\/td><td>0.5 \u2013 10 mm<\/td><\/tr>\n            <tr><td>Bore diameter<\/td><td>\u00d830 \u2013 600 mm<\/td><\/tr>\n            <tr><td>Quality grade<\/td><td>DIN 7\u20139<\/td><\/tr>\n            <tr><td>Profile tolerance<\/td><td>\u00b10.010 mm<\/td><\/tr>\n            <tr><td>Thin-wall capable<\/td><td>Yes \u2014 wall\/module ratio &gt; 2<\/td><\/tr>\n            <tr><td>Blind bore<\/td><td>Yes \u2014 shaper only<\/td><\/tr>\n            <tr><td>MOQ<\/td><td>1 pc (shaping) \/ 50 pcs (broach)<\/td><\/tr>\n            <tr><td>Lead time<\/td><td>7 \u2013 14 days<\/td><\/tr>\n          <\/table>\n        <\/div>\n      <\/div>\n      <div class=\"hxc-cb\" id=\"hxc-c4\">\n        <div class=\"hxc-ctx\">\n          <div class=\"hxc-cttl\">5-Axis CNC Milling<\/div>\n          <div class=\"hxc-cdesc\">For ring gear housings integrating bearing seats, mounting flanges, oil passages, and internal gear teeth in a single part. 5-axis milling completes all features in one setup, ensuring concentricity between the internal gear profile and outer housing features.<\/div>\n          <table class=\"hxc-tbl\">\n            <tr><td>Module range<\/td><td>1 \u2013 16 mm<\/td><\/tr>\n            <tr><td>Max OD<\/td><td>\u00d81,200 mm<\/td><\/tr>\n            <tr><td>Integrated features<\/td><td>Flanges, bearing bores, oil ports<\/td><\/tr>\n            <tr><td>Concentricity<\/td><td>\u2264 0.010 mm (ID to OD)<\/td><\/tr>\n            <tr><td>MOQ<\/td><td>1 pc<\/td><\/tr>\n            <tr><td>Lead time (proto)<\/td><td>5 \u2013 12 days<\/td><\/tr>\n            <tr><td>Materials<\/td><td>All metals + engineering plastics<\/td><\/tr>\n            <tr><td>Quality grade<\/td><td>DIN 7\u20139<\/td><\/tr>\n          <\/table>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- \u2550\u2550\u2550 MATERIALS \u2550\u2550\u2550 -->\n<div class=\"hxc-s-sf\">\n  <div class=\"hxc-inner\">\n    <span class=\"hxc-ey\">Materials<\/span>\n    <h2 class=\"hxc-h2\">50+ Certified Materials<\/h2>\n    <p class=\"hxc-sub\" style=\"margin-bottom:28px\">Full mill certificates and spectral analysis on every batch \u2014 steel, stainless, aluminum, brass, bronze, and engineering plastics for any custom internal ring gear specification.<\/p>\n    <div class=\"hxc-mts\">\n      <div class=\"hxc-mtt on\" onclick=\"hxcMat(this,'hxc-met')\">Metals<\/div>\n      <div class=\"hxc-mtt\" onclick=\"hxcMat(this,'hxc-pla')\">Engineering Plastics<\/div>\n    <\/div>\n    <div id=\"hxc-met\" class=\"hxc-mg\">\n      <div class=\"hxc-mc\"><div class=\"hxc-mci\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Passivation-Stainless-Steel-scaled.webp\" alt=\"20CrMnTi steel internal ring gear hardened\"><\/div><div class=\"hxc-mif\"><div class=\"hxc-mn\">20CrMnTi Steel<\/div><div class=\"hxc-mp\">Case-hardened, HRC 58\u201362 surface. The default steel for hardened internal ring gears in automotive planetary gearboxes.<\/div><div class=\"hxc-mtgs\"><span class=\"hxc-mtg\">High Load<\/span><span class=\"hxc-mtg\">Hardened<\/span><span class=\"hxc-mtg\">Automotive<\/span><\/div><\/div><\/div>\n      <div class=\"hxc-mc\"><div class=\"hxc-mci\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Alloy-Steel-CNC.jpg\" alt=\"42CrMo4 alloy steel internal gear ring industrial\"><\/div><div class=\"hxc-mif\"><div class=\"hxc-mn\">42CrMo4 Alloy Steel<\/div><div class=\"hxc-mp\">Through-hardened, excellent fatigue resistance. Standard for large-bore internal gear rings in heavy industrial reducers.<\/div><div class=\"hxc-mtgs\"><span class=\"hxc-mtg\">Heavy Duty<\/span><span class=\"hxc-mtg\">Large Bore<\/span><\/div><\/div><\/div>\n      <div class=\"hxc-mc\"><div class=\"hxc-mci\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/aluminum-spur-gears-factories-scaled.webp\" alt=\"aluminum 6061 7075 internal ring gear aerospace robot\"><\/div><div class=\"hxc-mif\"><div class=\"hxc-mn\">Al 6061-T6 \/ 7075<\/div><div class=\"hxc-mp\">Lightweight aluminum internal ring gears, anodizable. Aerospace actuators and robot joint reducers where mass matters.<\/div><div class=\"hxc-mtgs\"><span class=\"hxc-mtg\">Lightweight<\/span><span class=\"hxc-mtg\">Anodizable<\/span><\/div><\/div><\/div>\n      <div class=\"hxc-mc\"><div class=\"hxc-mci\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Brass-Nuts.jpg\" alt=\"brass internal ring gear low noise instrument\"><\/div><div class=\"hxc-mif\"><div class=\"hxc-mn\">C36000 Brass<\/div><div class=\"hxc-mp\">Free-machining brass internal ring gears, low-noise operation. Used in clocks, instruments, and small quiet drives.<\/div><div class=\"hxc-mtgs\"><span class=\"hxc-mtg\">Low Noise<\/span><span class=\"hxc-mtg\">Corrosion-Res.<\/span><\/div><\/div><\/div>\n      <div class=\"hxc-mc\"><div class=\"hxc-mci\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Brass-Nuts.jpg\" alt=\"phosphor bronze internal ring gear self lubricating\"><\/div><div class=\"hxc-mif\"><div class=\"hxc-mn\">Phosphor Bronze<\/div><div class=\"hxc-mp\">Self-lubricating against steel mate. Bronze internal ring gears excel as wear-resistant annulus elements in slow-speed drives.<\/div><div class=\"hxc-mtgs\"><span class=\"hxc-mtg\">Self-Lubricating<\/span><span class=\"hxc-mtg\">Wear-Res.<\/span><\/div><\/div><\/div>\n      <div class=\"hxc-mc\"><div class=\"hxc-mci\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Martensitic-Stainless-Steel-420.jpg\" alt=\"SUS316L stainless steel internal ring gear medical food\"><\/div><div class=\"hxc-mif\"><div class=\"hxc-mn\">SUS304 \/ 316L Stainless<\/div><div class=\"hxc-mp\">Customized stainless steel internal gear rings \u2014 food-grade, medical, and cleanroom applications. Sterilizable.<\/div><div class=\"hxc-mtgs\"><span class=\"hxc-mtg\">Food Grade<\/span><span class=\"hxc-mtg\">Medical<\/span><\/div><\/div><\/div>\n    <\/div>\n    <div id=\"hxc-pla\" class=\"hxc-mg\" style=\"display:none\">\n      <div class=\"hxc-mc\"><div class=\"hxc-mci\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/POM-Plastic-Gears.webp\" alt=\"POM Delrin plastic internal ring gear self lubricating\"><\/div><div class=\"hxc-mif\"><div class=\"hxc-mn\">POM (Delrin)<\/div><div class=\"hxc-mp\">Self-lubricating plastic internal ring gears. Low friction, dimensionally stable, often run dry \u2014 the default for service robots, consumer products, and quiet planetary drives.<\/div><div class=\"hxc-mtgs\"><span class=\"hxc-mtg\">Self-lubricated<\/span><span class=\"hxc-mtg\">Low Noise<\/span><\/div><\/div><\/div>\n      <div class=\"hxc-mc\"><div class=\"hxc-mci\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Nylon-Gears.webp\" alt=\"nylon PA66 plastic internal ring gear glass filled\"><\/div><div class=\"hxc-mif\"><div class=\"hxc-mn\">Nylon PA66-GF30<\/div><div class=\"hxc-mp\">30% glass-filled nylon plastic internal ring gears with higher load capacity and reduced creep vs. unfilled POM.<\/div><div class=\"hxc-mtgs\"><span class=\"hxc-mtg\">High Strength<\/span><span class=\"hxc-mtg\">Lightweight<\/span><\/div><\/div><\/div>\n      <div class=\"hxc-mc\"><div class=\"hxc-mci\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/peek.jpg\" alt=\"PEEK plastic internal ring gear high temp medical\"><\/div><div class=\"hxc-mif\"><div class=\"hxc-mn\">PEEK<\/div><div class=\"hxc-mp\">High-temperature PEEK plastic internal ring gears, rated to 260\u00b0C. Chemical-resistant and sterilizable for surgical and lab instruments.<\/div><div class=\"hxc-mtgs\"><span class=\"hxc-mtg\">High Temp<\/span><span class=\"hxc-mtg\">Chemical Res.<\/span><\/div><\/div><\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- \u2550\u2550\u2550 WHY CHOOSE HXC (NEW) \u2550\u2550\u2550 -->\n<style>\n.hxc-wcg{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:8px}\n.hxc-wcc{background:#fff;border:0.5px solid var(--border,#e4e8ec);border-radius:8px;padding:26px 26px 24px;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}\n.hxc-wcc:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(31,78,121,0.08)}\n.hxc-wci{width:44px;height:44px;border-radius:8px;background:#f0f4f8;display:flex;align-items:center;justify-content:center;font-size:20px;margin-bottom:16px;color:#1F4E79;line-height:1}\n.hxc-wct{font-family:var(--bd,inherit);font-size:14px;font-weight:600;color:var(--text,#1c242c);margin-bottom:10px;line-height:1.4}\n.hxc-wcd{font-size:12.5px;color:var(--muted,#6a7682);line-height:1.7;flex:1}\n.hxc-wcd strong{color:var(--text,#1c242c);font-weight:500}\n@media(min-width:769px) and (max-width:1024px){.hxc-wcg{grid-template-columns:repeat(2,1fr)}}\n@media(max-width:768px){.hxc-wcg{grid-template-columns:1fr;gap:14px}.hxc-wcc{padding:22px 22px 20px}}\n<\/style>\n\n<div class=\"hxc-s\" id=\"hxc-why\">\n  <div class=\"hxc-inner\">\n    <span class=\"hxc-ey\">Why HXC<\/span>\n    <h2 class=\"hxc-h2\">Why Choose HXC as Your Internal Ring Gear Manufacturer<\/h2>\n    <p class=\"hxc-sub\" style=\"margin-bottom:32px\">A China-based internal gear ring factory with in-house hobbing, grinding, and Klingelnberg inspection \u2014 direct factory pricing, customized quotations in 48 hours, no middleman.<\/p>\n\n    <div class=\"hxc-wcg\">\n\n      <div class=\"hxc-wcc\">\n        <div class=\"hxc-wci\">\ud83c\udfed<\/div>\n        <div class=\"hxc-wct\">Established Internal Gear Ring Factory in China<\/div>\n        <div class=\"hxc-wcd\">Our HXC internal gear ring factory in <strong>Dongguan, China<\/strong> runs CNC hobbing centres, internal profile grinders, and a dedicated Klingelnberg gear lab \u2014 all under one roof. <strong>Made in China since 2008<\/strong>, exporting to 35+ countries as a direct internal gear ring company, not a trading agent.<\/div>\n      <\/div>\n\n      <div class=\"hxc-wcc\">\n        <div class=\"hxc-wci\">\ud83d\udcac<\/div>\n        <div class=\"hxc-wct\">Customized Quotation in 48 Hours<\/div>\n        <div class=\"hxc-wcd\">Send your drawing \u2014 we return a <strong>customized internal gear ring quotation<\/strong> with material, process, tolerance, lead time, and unit price. No salesman handoffs. Manufacturer quotation directly from our engineering team, with itemized cost breakdown so you see exactly what you're paying for.<\/div>\n      <\/div>\n\n      <div class=\"hxc-wcc\">\n        <div class=\"hxc-wci\">\ud83c\udfaf<\/div>\n        <div class=\"hxc-wct\">DIN 5 In-House Internal Grinding<\/div>\n        <div class=\"hxc-wcd\">Most internal gear ring suppliers and manufacturers outsource grinding. We don't. Dedicated internal profile grinders deliver <strong>DIN 5\u20136 precision<\/strong> on planetary annulus gears \u2014 critical for robot joint reducers, servo actuators, and aerospace planetary stages.<\/div>\n      <\/div>\n\n      <div class=\"hxc-wcc\">\n        <div class=\"hxc-wci\">\ud83d\udd27<\/div>\n        <div class=\"hxc-wct\">1 pc MOQ \u00b7 Full Customization<\/div>\n        <div class=\"hxc-wcd\">Whether you need <strong>one customized internal gear ring<\/strong> for prototype testing or 10,000-piece production runs, the same engineering team handles your order. No tooling fee for standard modules. Internal gear ring customization is what we do every day \u2014 odd modules, custom helix angles, integrated housings.<\/div>\n      <\/div>\n\n      <div class=\"hxc-wcc\">\n        <div class=\"hxc-wci\">\ud83e\uddea<\/div>\n        <div class=\"hxc-wct\">Metal &amp; Plastic Internal Ring Gears<\/div>\n        <div class=\"hxc-wcd\">Steel, stainless, aluminum, brass, bronze, and engineering plastics \u2014 POM, nylon, PEEK. <strong>Plastic internal ring gears<\/strong> for service robots, medical pumps, and low-noise consumer products are a HXC specialty other gear shops don't bother with.<\/div>\n      <\/div>\n\n      <div class=\"hxc-wcc\">\n        <div class=\"hxc-wci\">\ud83d\udccf<\/div>\n        <div class=\"hxc-wct\">Bore Sizes \u00d830 mm to \u00d81,200 mm<\/div>\n        <div class=\"hxc-wcd\">From miniature 30 mm bore ring gears for instrument drives, to standard <strong>300 mm internal ring gears<\/strong> for industrial planetary reducers, to large \u00d81,200 mm ring gears for wind-power and heavy industry. One factory, full range, no outsourcing.<\/div>\n      <\/div>\n\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- \u2550\u2550\u2550 CASE STUDIES \u2550\u2550\u2550 -->\n<div class=\"hxc-s-sf\" id=\"hxc-cases\">\n  <div class=\"hxc-inner\">\n    <span class=\"hxc-ey\">Case Studies<\/span>\n    <h2 class=\"hxc-h2\">Real Internal Ring Gear Projects<\/h2>\n    <p class=\"hxc-sub\" style=\"margin-bottom:36px\">From prototype planetary ring gears to high-volume production \u2014 verified results from our customers, all made in our China factory.<\/p>\n    <div class=\"hxc-casg\">\n      <div class=\"hxc-casc hxc-rv\">\n        <div class=\"hxc-casi\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Planetary-Ring-Gear-\u2014-3-Stage-Gearbox.webp\" alt=\"planetary ring gear annulus gearbox automotive 20CrMnTi case hardened\">\n          <div class=\"hxc-casl\">Automotive<\/div>\n        <\/div>\n        <div class=\"hxc-casb\">\n          <div class=\"hxc-cast\">Planetary Ring Gear \u2014 3-Stage Gearbox<\/div>\n          <div class=\"hxc-casm\">\n            <div class=\"hxc-kv\"><div class=\"hxc-k\">Material<\/div><div class=\"hxc-v\">20CrMnTi<\/div><\/div>\n            <div class=\"hxc-kv\"><div class=\"hxc-k\">Bore Dia.<\/div><div class=\"hxc-v\">\u00d8220 mm<\/div><\/div>\n            <div class=\"hxc-kv\"><div class=\"hxc-k\">Module \/ Z<\/div><div class=\"hxc-v\">M3 \/ Z72<\/div><\/div>\n            <div class=\"hxc-kv\"><div class=\"hxc-k\">Quantity<\/div><div class=\"hxc-v\">500 pcs<\/div><\/div>\n          <\/div>\n          <div class=\"hxc-casr\">\u2713 DIN 6 \u00b7 Profile error \u2264 0.006 mm \u00b7 100% CMM verified<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"hxc-casc hxc-rv\">\n        <div class=\"hxc-casi\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Internal-Helical-Ring-Gear-\u2014-Robot-Joint.webp\" alt=\"internal helical ring gear robot joint actuator aluminum DIN 5 anodized\">\n          <div class=\"hxc-casl\">Robotics<\/div>\n        <\/div>\n        <div class=\"hxc-casb\">\n          <div class=\"hxc-cast\">Internal Helical Ring Gear \u2014 Robot Joint<\/div>\n          <div class=\"hxc-casm\">\n            <div class=\"hxc-kv\"><div class=\"hxc-k\">Material<\/div><div class=\"hxc-v\">Al 7075-T6<\/div><\/div>\n            <div class=\"hxc-kv\"><div class=\"hxc-k\">Helix Angle<\/div><div class=\"hxc-v\">20\u00b0<\/div><\/div>\n            <div class=\"hxc-kv\"><div class=\"hxc-k\">Grade<\/div><div class=\"hxc-v\">DIN 5<\/div><\/div>\n            <div class=\"hxc-kv\"><div class=\"hxc-k\">Quantity<\/div><div class=\"hxc-v\">60 pcs<\/div><\/div>\n          <\/div>\n          <div class=\"hxc-casr\">\u2713 FAI approved 1st cycle \u00b7 concentricity \u2264 0.008 mm<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"hxc-casc hxc-rv\">\n        <div class=\"hxc-casi\">\n          <img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Large-Ring-Gear-\u2014-Wind-Turbine-Main-Stage.webp\" alt=\"large internal ring gear wind turbine gearbox 42CrMo4 case hardened\">\n          <div class=\"hxc-casl\">Wind Energy<\/div>\n        <\/div>\n        <div class=\"hxc-casb\">\n          <div class=\"hxc-cast\">Large Ring Gear \u2014 Wind Turbine Main Stage<\/div>\n          <div class=\"hxc-casm\">\n            <div class=\"hxc-kv\"><div class=\"hxc-k\">Material<\/div><div class=\"hxc-v\">42CrMo4<\/div><\/div>\n            <div class=\"hxc-kv\"><div class=\"hxc-k\">Bore Dia.<\/div><div class=\"hxc-v\">\u00d8800 mm<\/div><\/div>\n            <div class=\"hxc-kv\"><div class=\"hxc-k\">Module \/ Z<\/div><div class=\"hxc-v\">M8 \/ Z90<\/div><\/div>\n            <div class=\"hxc-kv\"><div class=\"hxc-k\">Quantity<\/div><div class=\"hxc-v\">20 pcs<\/div><\/div>\n          <\/div>\n          <div class=\"hxc-casr\">\u2713 Induction hardened \u00b7 DIN 7 \u00b7 Klingelnberg verified<\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- \u2550\u2550\u2550 PROCESS \u2550\u2550\u2550 -->\n<div class=\"hxc-s-sf\">\n  <div class=\"hxc-inner\">\n    <div style=\"text-align:center\">\n      <span class=\"hxc-ey\">How It Works<\/span>\n      <h2 class=\"hxc-h2\" style=\"margin:0 auto 10px\">From Drawing to Your Door<\/h2>\n      <p class=\"hxc-sub\" style=\"margin:0 auto\">Upload your internal ring gear drawing \u2014 include bore diameter, module, tooth count, helix angle (if any), and accuracy class. We handle the rest from our China factory.<\/p>\n    <\/div>\n    <div class=\"hxc-psg\">\n      <div class=\"hxc-ps\"><div class=\"hxc-psn\">01<\/div><div class=\"hxc-pst\">Upload CAD \/ Drawing<\/div><div class=\"hxc-psd\">STEP, DXF, DWG or PDF. Specify bore diameter, module, Z, helix angle, and DIN class.<\/div><\/div>\n      <div class=\"hxc-ps\"><div class=\"hxc-psn\">02<\/div><div class=\"hxc-pst\">Customized Quotation in 48 Hours<\/div><div class=\"hxc-psd\">Manufacturer quotation direct from our engineering team \u2014 process (hobbing \/ shaping \/ grinding), material, lead time, and itemized factory pricing. No middleman markup.<\/div><\/div>\n      <div class=\"hxc-ps\"><div class=\"hxc-psn\">03<\/div><div class=\"hxc-pst\">Production &amp; CMM QC<\/div><div class=\"hxc-psd\">Internal gear machining with Klingelnberg and CMM measurement \u2014 profile, concentricity, and runout verified before shipment.<\/div><\/div>\n      <div class=\"hxc-ps\"><div class=\"hxc-psn\">04<\/div><div class=\"hxc-pst\">Ship Worldwide<\/div><div class=\"hxc-psd\">Protective packaging with full inspection report. DHL \/ FedEx \/ sea freight from China to your door.<\/div><\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- \u2550\u2550\u2550 QUALITY \u2550\u2550\u2550 -->\n<div class=\"hxc-s\">\n  <div class=\"hxc-inner\">\n    <span class=\"hxc-ey\">Quality<\/span>\n    <h2 class=\"hxc-h2\">Zero-Defect Commitment<\/h2>\n    <p class=\"hxc-sub\" style=\"margin-bottom:36px\">Every internal ring gear leaving our China factory passes a 4-stage inspection covering internal profile accuracy, concentricity, and bore geometry.<\/p>\n    <div class=\"hxc-qg\">\n      <div>\n        <div class=\"hxc-lbl\">Certifications &amp; Equipment<\/div>\n        <div class=\"hxc-qc\"><div class=\"hxc-qci\">\u2713<\/div><div><div class=\"hxc-qcn\">ISO 9001:2015<\/div><div class=\"hxc-qcd\">Quality Management System \u2014 all internal gear manufacturing processes certified<\/div><\/div><\/div>\n        <div class=\"hxc-qc\"><div class=\"hxc-qci\">\ud83d\udcd0<\/div><div><div class=\"hxc-qcn\">DIN 3961\u20133967 \/ AGMA Standards<\/div><div class=\"hxc-qcd\">Internal gear tolerance classes 5\u20139. Concentricity (Fr) and profile (Ff) measured on each part.<\/div><\/div><\/div>\n        <div class=\"hxc-qc\"><div class=\"hxc-qci\">\ud83d\udd2d<\/div><div><div class=\"hxc-qcn\">Zeiss CMM + Klingelnberg<\/div><div class=\"hxc-qcd\">3D CMM verifies bore geometry and flange flatness. Klingelnberg checks internal tooth profile and helix deviation.<\/div><\/div><\/div>\n        <div class=\"hxc-qc\"><div class=\"hxc-qci\">\ud83d\udcc4<\/div><div><div class=\"hxc-qcn\">Full Material Certification<\/div><div class=\"hxc-qcd\">Mill cert + spectral analysis confirms alloy grade before machining \u2014 essential for safety-critical ring gear applications.<\/div><\/div><\/div>\n      <\/div>\n      <div>\n        <div class=\"hxc-lbl\">4-Stage Inspection Protocol<\/div>\n        <div class=\"hxc-qs\"><div class=\"hxc-qsn\">1<\/div><div><div class=\"hxc-qst\">Incoming Material Check<\/div><div class=\"hxc-qsd\">Spectral analyzer verifies alloy grade. Forged ring blanks are ultrasonically tested for internal defects before gear cutting.<\/div><\/div><\/div>\n        <div class=\"hxc-qs\"><div class=\"hxc-qsn\">2<\/div><div><div class=\"hxc-qst\">Post-Machining FAI<\/div><div class=\"hxc-qsd\">CMM measures bore diameter, roundness, flatness, and concentricity. Klingelnberg verifies internal tooth profile on first article before batch approval.<\/div><\/div><\/div>\n        <div class=\"hxc-qs\"><div class=\"hxc-qsn\">3<\/div><div><div class=\"hxc-qst\">Post-Heat-Treatment Check<\/div><div class=\"hxc-qsd\">Hardness, case depth, and distortion are verified after hardening. Distorted ring gears are corrected before grinding \u2014 no compromises on bore roundness.<\/div><\/div><\/div>\n        <div class=\"hxc-qs\"><div class=\"hxc-qsn\">4<\/div><div><div class=\"hxc-qst\">Final Outgoing Inspection<\/div><div class=\"hxc-qsd\">100% visual + sampled full CMM. Complete internal gear measurement report \u2014 profile, concentricity, runout, surface finish \u2014 shipped with every order.<\/div><\/div><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- \u2550\u2550\u2550 TESTIMONIALS \u2550\u2550\u2550 -->\n<div class=\"hxc-s\">\n  <div class=\"hxc-inner\">\n    <div style=\"text-align:center;margin-bottom:36px\">\n      <span class=\"hxc-ey\">Reviews<\/span>\n      <h2 class=\"hxc-h2\">Trusted China Internal Gear Ring Manufacturer<\/h2>\n    <\/div>\n    <div class=\"hxc-tsg\">\n      <div class=\"hxc-tsi hxc-rv\">\n        <div class=\"hxc-tss\">\u2605\u2605\u2605\u2605\u2605<\/div>\n        <div class=\"hxc-tst\">\"We needed M3 planetary ring gears in 20CrMnTi, hobbed and ground to DIN 6. HXC delivered 500 pcs in 14 days. Profile error was under 0.006 mm across all parts. Their CMM report format was exactly what our quality system required.\"<\/div>\n        <div class=\"hxc-tshr\"><\/div>\n        <div class=\"hxc-tsau\"><div class=\"hxc-tsav\">FK<\/div><div><div class=\"hxc-tsnm\">Felix K.<\/div><div class=\"hxc-tsco\">Gearbox Design Engineer \u00b7 Germany<\/div><\/div><\/div>\n      <\/div>\n      <div class=\"hxc-tsi hxc-rv\">\n        <div class=\"hxc-tss\">\u2605\u2605\u2605\u2605\u2605<\/div>\n        <div class=\"hxc-tst\">\"The internal helical ring gears for our robot joint actuator were complex \u2014 Al 7075, 20\u00b0 helix, DIN 5 with a tight concentricity spec. HXC got it right first article and delivered 60 pcs in 12 days. Backlash was better than drawing.\"<\/div>\n        <div class=\"hxc-tshr\"><\/div>\n        <div class=\"hxc-tsau\"><div class=\"hxc-tsav\">YM<\/div><div><div class=\"hxc-tsnm\">Yuki M.<\/div><div class=\"hxc-tsco\">Mechatronics Lead \u00b7 Japan<\/div><\/div><\/div>\n      <\/div>\n      <div class=\"hxc-tsi hxc-rv\">\n        <div class=\"hxc-tss\">\u2605\u2605\u2605\u2605\u2605<\/div>\n        <div class=\"hxc-tst\">\"\u00d8800mm ring gear in 42CrMo4 for a wind turbine gearbox \u2014 a challenging piece. HXC did the induction hardening, grinding, and Klingelnberg measurement. All 20 pieces passed our incoming inspection on the first attempt.\"<\/div>\n        <div class=\"hxc-tshr\"><\/div>\n        <div class=\"hxc-tsau\"><div class=\"hxc-tsav\">PL<\/div><div><div class=\"hxc-tsnm\">Pierre L.<\/div><div class=\"hxc-tsco\">Mechanical Engineer \u00b7 France<\/div><\/div><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- \u2550\u2550\u2550 FAQ \u2550\u2550\u2550 -->\n<div class=\"hxc-s-sf\" id=\"hxc-faq\">\n  <div class=\"hxc-inner\">\n    <span class=\"hxc-ey\">FAQ<\/span>\n    <h2 class=\"hxc-h2\">Internal Ring Gear \u2014 Frequently Asked Questions<\/h2>\n    <p class=\"hxc-sub\" style=\"margin-bottom:40px\">Common questions from engineers and buyers about internal ring gears, planetary annulus gears, customized internal gear ring quotations, and manufacturing.<\/p>\n    <div class=\"hxc-faq-grid\">\n      <!-- Column 1 -->\n      <div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">What is an internal ring gear?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">An internal ring gear (also called an <strong>annulus gear<\/strong> or <strong>internal gear ring<\/strong>) is a cylindrical gear with teeth cut on its <strong>inner bore surface<\/strong>, pointing inward toward the center axis. The mating gear (planet gear or pinion) runs inside the ring, in the same direction of rotation. Internal ring gears are the fixed or rotating outer element in planetary gear systems, epicyclic gearboxes, and differential gear sets. They offer a higher contact ratio than external gear pairs and are more compact for a given reduction ratio.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">How much does a custom internal ring gear cost?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">Internal gear ring production cost depends on six variables: <strong>(1) bore diameter and module<\/strong> \u2014 a 300 mm internal ring gear in M3 costs more than a 100 mm in M2; <strong>(2) material grade<\/strong> \u2014 20CrMnTi case-carburized steel is more expensive than 42CrMo4 through-hardened; <strong>(3) accuracy class<\/strong> \u2014 DIN 5 (ground) is roughly 2\u00d7 the price of DIN 7 (hobbed only); <strong>(4) heat treatment<\/strong> \u2014 carburizing and post-hardening grinding add 25\u201340% to material cost; <strong>(5) order quantity<\/strong> \u2014 1-piece prototypes cost more per unit than 100-piece batches; <strong>(6) integrated features<\/strong> \u2014 housings with bearing seats and oil ports cost more than simple ring inserts. Send your drawing for a free customized quotation \u2014 we typically respond within 48 hours with firm price and lead time.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">How can I request a customized internal gear ring quotation?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">Three ways to get a customized internal gear ring quotation from HXC: <strong>(1) Upload your CAD \/ PDF drawing<\/strong> through our quote form \u2014 fastest, response within 48 hours. <strong>(2) Email your specifications<\/strong> (module, tooth count, bore diameter, helix angle if any, material, accuracy class, quantity) directly to our engineering team. <strong>(3) Schedule a video call<\/strong> with our China factory for complex projects requiring DFM discussion. Every manufacturer quotation includes itemized cost breakdown, process recommendation, alternative material options, and firm lead time. Free, no obligation, no salesman markup.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">What is the difference between an internal gear and a ring gear?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">\"Ring gear\" and \"internal gear\" are often used interchangeably, but there is a subtle distinction in usage. <strong>Internal gear<\/strong> is the precise engineering term for any gear with inward-facing teeth. <strong>Ring gear<\/strong> is a common name that most often refers to the annulus element in a <strong>planetary gear system<\/strong>, or to the large-diameter internally-toothed gear on an automotive flywheel (engaged by the starter motor). In practice, both terms \u2014 along with \"internal gear ring\" \u2014 refer to the same tooth geometry: teeth on the inner cylindrical surface.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">How is an internal ring gear made?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">Internal ring gears are manufactured by four main processes: <strong>(1) Gear shaping<\/strong> (most common) \u2014 a reciprocating cutter generates the internal teeth progressively; suitable for all bore sizes including blind bores. <strong>(2) Internal gear hobbing<\/strong> \u2014 faster for open-bore ring gears in production quantities. <strong>(3) Broaching<\/strong> \u2014 fastest for short face widths in high volumes. <strong>(4) 5-axis CNC milling<\/strong> \u2014 for complex ring gear housings integrating other features. After cutting, precision ring gears are case-hardened and <strong>internally profile-ground<\/strong> to achieve DIN 5\u20136 accuracy.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">What is the purpose of a ring gear in a planetary gearbox?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">In a planetary (epicyclic) gearbox, the internal ring gear \u2014 the <strong>annulus<\/strong> \u2014 is the outermost element. It can serve three roles depending on which element is fixed: <strong>(1) Fixed ring gear<\/strong> (most common) \u2014 the carrier rotates, giving a compact speed reduction. <strong>(2) Input ring gear<\/strong> \u2014 drives the planet carrier, with the sun gear as output. <strong>(3) Output ring gear<\/strong> \u2014 rotates while sun and carrier are input\/fixed. The ring gear's tooth count (always larger than the sun gear) largely determines the stage gear ratio. Ring gear tooth accuracy directly controls backlash, noise, and efficiency of the entire planetary stage.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">Can internal ring gears be helical?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">Yes \u2014 <strong>internal helical ring gears<\/strong> are produced by gear shaping with a helical shaper cutter or by internal helical hobbing. They offer the same advantages over internal spur ring gears as external helical gears over spur gears: quieter operation, higher contact ratio, and greater load capacity. The helix angle of the internal ring gear must match that of the mating planet or pinion gear (same angle, same hand for external pinion inside an internal ring gear). Common helix angles are <strong>15\u00b0\u201325\u00b0<\/strong> for planetary stages in servo actuators and precision gearboxes.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">What accuracy class is needed for planetary ring gears?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">Accuracy class depends on the application: <strong>DIN 7\u20139<\/strong> is sufficient for general industrial and automotive gearboxes where noise and efficiency are not critical. <strong>DIN 6<\/strong> is standard for automotive passenger car transmissions and industrial inline reducers. <strong>DIN 5<\/strong> is required for precision servo actuators, robot joints, and aerospace planetary stages where backlash must be controlled to &lt;0.02 mm. DIN 5 ring gears require post-hardening internal profile grinding, which is more expensive than hobbing alone. We offer all classes \u2014 our engineers will recommend the right accuracy for your application and budget.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">What materials are used for internal ring gears?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">Material choice mirrors external gear practice but with one extra constraint: ring gear blanks are more difficult to heat-treat uniformly due to wall thickness variation. <strong>20CrMnTi<\/strong> (carburized) is standard for automotive planetary ring gears \u2014 its predictable case depth and low distortion suit internal grinding after hardening. <strong>42CrMo4<\/strong> (through-hardened) is used for large-bore ring gears where case carburizing penetration would be insufficient. <strong>Al 7075-T6<\/strong> for lightweight robot ring gears. <strong>SUS316L<\/strong> for food, medical, and cleanroom applications. <strong>POM, nylon, PEEK<\/strong> for low-load plastic internal ring gears in service robots and consumer products.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">What is the minimum tooth count for an internal gear?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">Unlike external gears (17-tooth minimum to avoid undercut at 20\u00b0 pressure angle), internal gears have a <strong>minimum tooth count difference<\/strong> constraint between the ring gear and its mating pinion. To avoid involute interference (where the external pinion tooth tips foul the internal ring gear root), the <strong>tooth count difference must be at least 10\u201312 teeth<\/strong> for standard 20\u00b0 pressure angle gears. For example, if the planet gear has 20 teeth, the ring gear needs at least 32 teeth. This constraint is less restrictive at higher pressure angles (25\u00b0). Our engineers check interference conditions for every custom ring gear design as part of the free DFM review.<\/div>\n        <\/div>\n      <\/div>\n      <!-- Column 2 -->\n      <div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">Where is HXC's internal ring gear factory located?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">HXC's internal gear ring factory is located in <strong>Dongguan, Guangdong, China<\/strong> \u2014 a major precision manufacturing hub in the Pearl River Delta. We have been a Chinese internal ring gear manufacturer since 2008, exporting to clients in Germany, USA, Japan, France, Italy, Korea, and 30+ other countries. All gear cutting, heat treatment, grinding, and Klingelnberg inspection are performed in-house at our China factory \u2014 no outsourcing to subcontractors. Factory visits and video audits are welcome for serious buyers and procurement teams qualifying new China internal ring gear suppliers.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">What is the difference between internal and external gears?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\"><strong>External gears<\/strong> have teeth on the outer cylindrical surface and rotate in <strong>opposite directions<\/strong> when meshed. <strong>Internal ring gears<\/strong> have teeth on the inner bore surface and the mating gear rotates in the <strong>same direction<\/strong> \u2014 making internal gear pairs naturally suited to planetary systems where co-directional rotation is desired. Internal gear pairs also have a higher contact ratio and lower sliding velocity between teeth than external pairs of the same module, which means lower friction, quieter operation, and longer life at equivalent loads.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">How do you measure an internal ring gear?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">Internal ring gears are measured with specialised equipment: <strong>Klingelnberg or Gleason gear analysers<\/strong> fitted with internal probes measure tooth profile, helix deviation, pitch error, and runout directly on the internal teeth. For larger ring gears, <strong>CMM with a gear measurement module<\/strong> is used \u2014 a ruby-tip probe traces each tooth flank to build the profile deviation chart. <strong>Over-pin (or over-ball) diameter measurement<\/strong> is used for quick size checks on the shop floor. All HXC internal ring gears are measured on Klingelnberg equipment, and the full DIN 3962 measurement report is supplied with every order.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">What is a ring gear vs a sun gear?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">In a planetary gear system: the <strong>sun gear<\/strong> is a small external gear at the center, driven by the input shaft. The <strong>planet gears<\/strong> are intermediate external gears that mesh with both the sun and the ring. The <strong>ring gear<\/strong> (annulus) is the large internal gear at the periphery. Power flows in from the sun, through the planets, and out through either the carrier (for reduction) or the ring (for different ratio). The ring gear is always the largest and slowest-rotating element; the sun gear is the smallest and fastest. The ratio of ring to sun tooth counts determines the stage gear ratio.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">What causes ring gear failure?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">The most common ring gear failure modes are: <strong>(1) Pitting fatigue<\/strong> \u2014 contact stress exceeds material limit, causing surface flaking on internal tooth flanks; prevented by correct hardness, module size, and lubrication. <strong>(2) Bending fatigue<\/strong> \u2014 cyclic tooth root stress exceeds endurance limit; prevented by correct module, profile, and shot peening of roots. <strong>(3) Bore distortion<\/strong> \u2014 thin-wall ring gears distort during heat treatment, causing uneven tooth engagement; mitigated by proper blank support during carburizing and post-hardening grinding. <strong>(4) Fretting<\/strong> \u2014 micro-movement between ring gear OD and housing bore; prevented by interference fit and proper surface finish on the OD. We address all these in our DFM review.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">How is an internal ring gear different from a spur gear?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">The key differences: <strong>tooth location<\/strong> \u2014 spur gears have teeth on the outer surface; ring gears have teeth on the inner bore. <strong>Rotation direction<\/strong> \u2014 external spur gear pairs rotate oppositely; ring gear and pinion rotate in the same direction. <strong>Geometry<\/strong> \u2014 internal gear teeth have a concave (hollow) involute profile on the tooth face, compared to the convex profile of external gear teeth; this requires different cutting tools and inspection methods. <strong>Application<\/strong> \u2014 spur gears are used in simple external gear trains; ring gears are the annulus element of planetary and epicyclic systems. <strong>Minimum tooth count<\/strong> \u2014 constrained by the tooth count difference rule, not the undercut rule.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">What tolerance should I specify for an internal ring gear?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">Specify <strong>DIN accuracy class<\/strong> (5\u20139) based on your application speed and noise requirement. Additionally specify: <strong>bore diameter tolerance<\/strong> (typically H7 for press-fit housing installation or H6 for precision actuators); <strong>concentricity between bore ID and gear pitch circle<\/strong> (typically 0.01\u20130.02 mm TIR for actuators, 0.02\u20130.05 mm for industrial gearboxes); <strong>face runout<\/strong> (for axially located ring gears). If you are unsure, our engineers will recommend appropriate tolerances based on your planetary gear ratio, input torque, and speed \u2014 free with every quotation request.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">Can HXC make ring gears with integrated features?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">Yes \u2014 we regularly machine <strong>ring gear housings that integrate<\/strong> internal teeth, bearing seats (housing bore H7 or P7 for press fit), oil ports, mounting flanges, O-ring grooves, and alignment spigots in a single part. 5-axis CNC milling ensures concentricity between the internal gear pitch circle and all housing bores within 0.01 mm. This eliminates assembly error between a separate ring gear insert and its housing. Integrated ring gear housings are common in compact planetary actuators for robotics and aerospace. Send us your drawing \u2014 we will review it as part of our free DFM analysis.<\/div>\n        <\/div>\n        <div class=\"hxc-faq-item\">\n          <button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\" aria-expanded=\"false\">What is the lead time for custom internal ring gears?<span class=\"hxc-faq-icon\">+<\/span><\/button>\n          <div class=\"hxc-faq-body\">Lead times depend on complexity and process: <strong>Prototype (1\u20135 pcs), gear shaping + CMM<\/strong>: 5\u201310 days. <strong>Small batch (10\u201350 pcs), hobbing + standard inspection<\/strong>: 8\u201314 days. <strong>Precision batch (DIN 5\u20136), hobbing + hardening + grinding + Klingelnberg<\/strong>: 14\u201322 days. <strong>Large-diameter (&gt;\u00d8500mm) ring gears<\/strong>: 18\u201328 days depending on material and heat treatment. We provide firm lead times with every quotation. Rush production is available for an additional charge \u2014 discuss your timeline when uploading your drawing.<\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n\n<\/div><!-- .hxc-wrap -->\n\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 an internal ring gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"An internal ring gear (also called an annulus gear) is a cylindrical gear with teeth cut on its inner bore surface, pointing inward toward the center axis. The mating gear runs inside the ring in the same direction of rotation. Internal ring gears are the fixed or rotating outer element in planetary gear systems, epicyclic gearboxes, and differential gear sets.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between an internal gear and a ring gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Internal gear is the precise engineering term for any gear with inward-facing teeth. Ring gear is a common name that most often refers to the annulus element in a planetary gear system, or to the large-diameter internally-toothed gear on an automotive flywheel. In practice, both terms refer to the same tooth geometry \u2014 teeth on the inner cylindrical surface.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How is an internal ring gear made?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Internal ring gears are manufactured by four main processes: (1) Gear shaping \u2014 a reciprocating cutter generates internal teeth progressively; suitable for all bore sizes including blind bores. (2) Internal gear hobbing \u2014 faster for open-bore ring gears in production quantities. (3) Broaching \u2014 fastest for short face widths in high volumes. (4) 5-axis CNC milling \u2014 for complex ring gear housings. After cutting, precision ring gears are case-hardened and internally profile-ground to achieve DIN 5\u20136 accuracy.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the purpose of a ring gear in a planetary gearbox?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"In a planetary gearbox, the internal ring gear (annulus) is the outermost element. When fixed, the carrier rotates giving a compact speed reduction. The ring gear tooth count determines the stage gear ratio. Ring gear tooth accuracy directly controls backlash, noise, and efficiency of the entire planetary stage.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can internal ring gears be helical?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes \u2014 internal helical ring gears are produced by gear shaping with a helical shaper cutter or by internal helical hobbing. They offer quieter operation, higher contact ratio, and greater load capacity than internal spur ring gears. Common helix angles are 15\u00b0\u201325\u00b0 for planetary stages in servo actuators and precision gearboxes.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What accuracy class is needed for planetary ring gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"DIN 7\u20139 is sufficient for general industrial and automotive gearboxes. DIN 6 is standard for automotive transmissions and industrial inline reducers. DIN 5 is required for precision servo actuators and robot joints where backlash must be controlled to less than 0.02 mm. DIN 5 ring gears require post-hardening internal profile grinding.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What materials are used for internal ring gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"20CrMnTi (carburized) is standard for automotive planetary ring gears. 42CrMo4 (through-hardened) is used for large-bore ring gears. Al 7075-T6 for lightweight robot ring gears. SUS316L for food, medical, and cleanroom applications. POM and PEEK for low-load plastic planetary systems.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the minimum tooth count for an internal gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Internal gears have a minimum tooth count difference constraint between the ring gear and its mating pinion. To avoid involute interference, the tooth count difference must be at least 10\u201312 teeth for standard 20\u00b0 pressure angle gears. This constraint is less restrictive at higher pressure angles (25\u00b0).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between internal and external gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"External gears have teeth on the outer cylindrical surface and rotate in opposite directions when meshed. Internal ring gears have teeth on the inner bore surface and the mating gear rotates in the same direction. Internal gear pairs also have a higher contact ratio and lower sliding velocity than external pairs of the same module.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do you measure an internal ring gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Internal ring gears are measured with Klingelnberg or Gleason gear analysers fitted with internal probes, measuring tooth profile, helix deviation, pitch error, and runout. For larger ring gears, CMM with a gear measurement module is used. Over-pin diameter measurement is used for quick size checks. HXC supplies the full DIN 3962 measurement report with every order.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What causes ring gear failure?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The most common ring gear failure modes are: (1) Pitting fatigue \u2014 contact stress exceeds material limit; (2) Bending fatigue \u2014 cyclic tooth root stress; (3) Bore distortion \u2014 thin-wall ring gears distort during heat treatment; (4) Fretting \u2014 micro-movement between ring gear OD and housing bore. HXC addresses all these failure modes in the free DFM review provided with every quotation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What tolerance should I specify for an internal ring gear?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Specify DIN accuracy class (5\u20139), bore diameter tolerance (typically H7 for housing installation), concentricity between bore ID and gear pitch circle (0.01\u20130.02 mm TIR for actuators, 0.02\u20130.05 mm for industrial gearboxes), and face runout. Our engineers will recommend appropriate tolerances free with every quotation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the lead time for custom internal ring gears?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Prototype (1\u20135 pcs), gear shaping + CMM: 5\u201310 days. Small batch (10\u201350 pcs), hobbing + standard inspection: 8\u201314 days. Precision batch (DIN 5\u20136), hobbing + hardening + grinding + Klingelnberg: 14\u201322 days. Large-diameter (>\u00d8500mm) ring gears: 18\u201328 days.\"\n      }\n    }\n  ]\n}\n<\/script>\n\n<script>\nfunction hxcCap(el,id){\n  document.querySelectorAll('.hxc-ct').forEach(t=>t.classList.remove('on'));\n  document.querySelectorAll('.hxc-cb').forEach(p=>p.classList.remove('on'));\n  el.classList.add('on');document.getElementById(id).classList.add('on');\n}\nfunction hxcMat(el,type){\n  document.querySelectorAll('.hxc-mtt').forEach(t=>t.classList.remove('on'));\n  el.classList.add('on');\n  document.getElementById('hxc-met').style.display=type==='hxc-met'?'grid':'none';\n  document.getElementById('hxc-pla').style.display=type==='hxc-pla'?'grid':'none';\n}\nfunction hxcFaq(btn){\n  const body=btn.nextElementSibling,isOpen=btn.classList.contains('open');\n  btn.classList.toggle('open',!isOpen);btn.setAttribute('aria-expanded',String(!isOpen));\n  body.classList.toggle('open',!isOpen);\n}\nconst hxcObs=new IntersectionObserver(entries=>{\n  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ADVANTAGE LIST \u2500\u2500 *\/\n.HXCL .avlist{display:flex;flex-direction:column;gap:9px;margin-bottom:28px;}\n.HXCL .avitem{\n  display:flex;align-items:flex-start;gap:12px;\n  padding:14px 16px;\n  background:var(--wh);border:1.5px solid var(--bd);border-radius:13px;\n  transition:border-color .18s, box-shadow .18s;\n}\n.HXCL .avitem:hover{\n  border-color:var(--acC);\n  box-shadow:0 4px 16px var(--acA);\n}\n.HXCL .avitem .ico{\n  width:34px;height:34px;border-radius:8px;flex-shrink:0;\n  background:var(--acA);border:1px solid var(--acC);\n  display:flex;align-items:center;justify-content:center;font-size:15px;\n  transition:background .18s;\n}\n.HXCL .avitem:hover .ico{background:var(--acB);}\n.HXCL .avitem .at{\n  font-family:var(--fh);font-size:14px;font-weight:700;\n  color:var(--tx);margin-bottom:2px;line-height:1.2;\n}\n.HXCL .avitem .ad{\n  font-size:12px;color:var(--tx1);line-height:1.62;\n}\n\n\/* \u2500\u2500 CERT TAGS \u2500\u2500 *\/\n.HXCL .certs{\n  display:flex;flex-wrap:wrap;gap:7px;\n  padding-top:20px;border-top:1.5px solid var(--bd);\n}\n.HXCL .cert{\n  padding:4px 11px;border-radius:100px;\n  background:var(--lt);border:1px solid var(--bd);\n  font-family:var(--fm);font-size:10px;color:var(--tx2);letter-spacing:.8px;\n}\n.HXCL .cert.hi{\n  background:var(--acA);border-color:var(--acC);\n  color:var(--ac);font-weight:700;\n}\n<\/style>\n\n<div class=\"HXCL\">\n<div class=\"panel\">\n\n  <div class=\"eyebrow\">Get a Quote<\/div>\n\n  <h2 class=\"headline\">\n    Send Your Drawing.<br><em>Get a 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-270cb122 e-con-full e-flex e-con e-child\" data-id=\"270cb122\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-16e6ac8e elementor-button-align-stretch elementor-widget elementor-widget-form\" data-id=\"16e6ac8e\" 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=\"947\"\/>\n\t\t\t<input type=\"hidden\" name=\"form_id\" value=\"16e6ac8e\"\/>\n\t\t\t<input type=\"hidden\" name=\"referer_title\" value=\"Internal Ring Gears | CNC Machined Precision Ring Gears | HXCNC\" \/>\n\n\t\t\t\t\t\t\t<input type=\"hidden\" name=\"queried_id\" value=\"947\"\/>\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 context...\"><\/textarea>\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-upload elementor-field-group elementor-column elementor-field-group-field_0071b0f elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-field_0071b0f\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tFile Upload\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t<input type=\"file\" name=\"form_fields[field_0071b0f]\" id=\"form-field-field_0071b0f\" class=\"elementor-field elementor-size-sm  elementor-upload-field\">\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-group elementor-column elementor-field-type-submit elementor-col-100 e-form__buttons\">\n\t\t\t\t\t<button class=\"elementor-button elementor-size-sm\" type=\"submit\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-arrow-alt-circle-right\" 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>Internal gear ring manufacturer &amp; factory \u00b7 Made in China \u00b7 Ships worldwide Custom Internal Ring GearsPrecision CNC Machined High-accuracy internal ring gears \u2014 also called annulus gears or internal gear rings \u2014 for planetary gearboxes, differential drives, and actuator systems. Internal spur, internal helical, metal and plastic profiles. Bore sizes from 30 mm to [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":39,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-947","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>Internal Ring Gears | CNC Machined Precision Ring Gears | HXCNC<\/title>\n<meta name=\"description\" content=\"Precision CNC machined internal ring gears for planetary gear systems and gearboxes. 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