{"id":1016,"date":"2026-04-08T00:55:05","date_gmt":"2026-04-08T00:55:05","guid":{"rendered":"https:\/\/hxcnc.com\/?page_id=1016"},"modified":"2026-06-09T09:48:30","modified_gmt":"2026-06-09T09:48:30","slug":"internal-spline-sleeves","status":"publish","type":"page","link":"https:\/\/hxcnc.com\/uk\/product\/internal-spline-sleeves\/","title":{"rendered":"\u0412\u043d\u0443\u0442\u0440\u0456\u0448\u043d\u0456 \u0448\u043b\u0456\u0446\u044c\u043e\u0432\u0456 \u0432\u0442\u0443\u043b\u043a\u0438"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1016\" class=\"elementor elementor-1016\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d2159c0 e-con-full e-flex e-con e-parent\" data-id=\"d2159c0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9866b62 elementor-widget elementor-widget-html\" data-id=\"9866b62\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Roboto:wght@300;400;500;700;900&family=Roboto+Condensed:wght@400;700;900&family=Roboto+Mono:wght@400;500&display=swap\" rel=\"stylesheet\">\n<style>\n.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.hxc-faq-q:hover,\n.hxc-faq-q.open { color:var(--primary); }\n\n\/* \u2550\u2550\u2550 TOKENS \u2550\u2550\u2550 *\/\n.hxc-wrap{\n  --bg:#F7F9FC;--card:#FFFFFF;--surface:#EEF3F8;\n  --text:#1F2937;--muted:#5B6777;--mute2:#9CA8B4;--border:#D7E0EA;\n  --primary:#2563EB;--hover:#1D4ED8;\n  --pa:rgba(37,99,235,.08);--pb:rgba(37,99,235,.15);--pc:rgba(37,99,235,.22);\n  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var(--border)}\n\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 12px;border-radius:20px;margin-bottom:14px}\n.hxc-ey::before{content:'';width:6px;height:6px;border-radius:50%;background:var(--accent);flex-shrink:0}\n.hxc-h2{font-family:var(--hd);font-size:clamp(24px,3vw,34px);font-weight:700;line-height:1.2;margin-bottom:12px}\n.hxc-sub{font-size:15px;color:var(--muted);max-width:540px;line-height:1.75}\n\n.hxc-btn{display:inline-flex;align-items:center;gap:8px;height:46px;padding:0 26px;border-radius:var(--r);font-family:var(--bd);font-size:14px;font-weight:500;cursor:pointer;border:1.5px solid transparent;transition:all .2s;white-space:nowrap}\n.hxc-p{background:var(--primary);color:#fff;border-color:var(--primary)}\n.hxc-p:hover{background:var(--hover);transform:translateY(-1px);box-shadow:0 4px 14px 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}\n.hxc-btn:hover .hxc-ar{transform:translateX(3px)}\n\n\/* \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n   HERO \u2014 ALS-style technical drawing board\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 *\/\n.hxc-hero2{\n  background:var(--card);\n  overflow:hidden;\n  position:relative;\n  border-bottom:.5px solid var(--border);\n}\n.hxc-hero2::before{\n  content:'';position:absolute;inset:0;\n  background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);\n  background-size:44px 44px;\n  opacity:.18;pointer-events:none;\n}\n.hxc-hero2::after{\n  content:'';position:absolute;top:0;right:0;bottom:0;width:44%;\n  background:linear-gradient(270deg,var(--surface),transparent);\n  pointer-events:none;\n}\n.hxc-hero2-stripe{\n  position:absolute;top:0;left:0;right:0;height:3px;\n  background:linear-gradient(90deg,var(--amb),#F59E0B,var(--amb));\n  z-index:2;\n}\n.hxc-hero2-grid{\n  position:relative;z-index:1;\n  display:grid;\n  grid-template-columns:1fr 520px;\n  min-height:640px;\n  align-items:stretch;\n}\n\n\/* LEFT *\/\n.hxc-hero2-L{\n  padding:80px 52px 72px 0;\n  display:flex;flex-direction:column;justify-content:center;\n  border-right:1px solid var(--border);\n}\n.hxc-hero2-flag{\n  display:flex;align-items:center;gap:10px;\n  margin-bottom:20px;flex-wrap:wrap;\n}\n.hxc-hero2-badge{\n  padding:4px 14px;border-radius:100px;\n  background:var(--pa);border:1px solid var(--pc);\n  font-family:var(--mn);font-size:10px;\n  color:var(--primary);\n  letter-spacing:2px;text-transform:uppercase;\n}\n.hxc-hero2-badge-amb{\n  background:var(--amA);border-color:var(--amC);color:var(--amb);\n}\n.hxc-hero2-id{\n  font-family:var(--mn);font-size:10px;\n  color:var(--mute2);letter-spacing:2px;\n}\n.hxc-hero2-h1{\n  font-family:var(--hd);\n  font-size:clamp(38px,5vw,68px);\n  font-weight:900;\n  line-height:.96;\n  letter-spacing:-2px;\n  color:var(--text);\n  margin-bottom:18px;\n}\n.hxc-hero2-h1 em{\n  color:var(--primary);\n  font-style:normal;\n  display:block;\n}\n.hxc-hero2-sub{\n  font-size:15px;color:var(--muted);\n  max-width:500px;line-height:1.78;\n  margin-bottom:28px;\n}\n.hxc-hero2-stats{\n  display:grid;grid-template-columns:repeat(3,1fr);gap:10px;\n  max-width:500px;margin-bottom:30px;\n}\n.hxc-hero2-stat{\n  padding:14px 10px;\n  background:var(--surface);\n  border:1px solid var(--border);\n  border-radius:10px;\n  text-align:center;\n  transition:all .18s;\n}\n.hxc-hero2-stat:hover{\n  background:var(--pa);border-color:var(--pc);\n}\n.hxc-hero2-stat-v{\n  font-family:var(--hd);\n  font-size:19px;font-weight:900;\n  color:var(--primary);line-height:1;\n}\n.hxc-hero2-stat-v sup{font-size:10px;font-weight:700;}\n.hxc-hero2-stat-l{\n  font-family:var(--mn);\n  font-size:9px;color:var(--mute2);\n  letter-spacing:1.5px;text-transform:uppercase;\n  margin-top:5px;\n}\n.hxc-hero2-btns{display:flex;gap:12px;flex-wrap:wrap;}\n\n\/* RIGHT \u2014 dark technical board *\/\n.hxc-hero2-R{\n  position:relative;\n  padding:40px 0 40px 48px;\n}\n.hxc-hero2-board{\n  position:relative;\n  background:linear-gradient(165deg,#0F172A 0%,#1E293B 60%,#0F172A 100%);\n  border-radius:24px;\n  height:100%;min-height:560px;\n  overflow:hidden;\n  box-shadow:0 30px 80px -20px rgba(15,23,42,.35),0 8px 24px -6px rgba(15,23,42,.2);\n}\n.hxc-hero2-board::before{\n  content:'';position:absolute;inset:0;\n  background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);\n  background-size:32px 32px;\n}\n.hxc-hero2-board::after{\n  content:'';position:absolute;top:-30%;right:-20%;\n  width:70%;height:70%;\n  background:radial-gradient(circle,rgba(37,99,235,.32),transparent 70%);\n}\n.hxc-hero2-ribbon{\n  position:absolute;top:18px;left:18px;right:18px;\n  display:flex;justify-content:space-between;align-items:center;\n  z-index:3;\n  font-family:var(--mn);font-size:10px;\n  color:rgba(255,255,255,.5);\n  letter-spacing:2px;text-transform:uppercase;\n}\n.hxc-hero2-ribbon .dot{\n  width:8px;height:8px;border-radius:50%;\n  background:#22C55E;\n  box-shadow:0 0 0 3px rgba(34,197,94,.2);\n  display:inline-block;margin-right:8px;vertical-align:middle;\n  animation:hxc-h2-pulse 2s ease-in-out infinite;\n}\n@keyframes hxc-h2-pulse{\n  0%,100%{box-shadow:0 0 0 3px rgba(34,197,94,.2);}\n  50%{box-shadow:0 0 0 6px rgba(34,197,94,.08);}\n}\n.hxc-hero2-scene{\n  position:absolute;inset:0;\n  display:flex;align-items:center;justify-content:center;\n  z-index:2;\n}\n.hxc-hero2-scene svg{width:94%;height:auto;}\n\n.hxc-hero2-pin{\n  position:absolute;z-index:3;\n  display:flex;align-items:center;gap:8px;\n  padding:5px 11px 5px 7px;\n  background:rgba(255,255,255,.95);\n  border-radius:100px;\n  font-family:var(--mn);font-size:10px;font-weight:600;\n  color:var(--primary);\n  box-shadow:0 4px 12px rgba(0,0,0,.3);\n}\n.hxc-hero2-pin::before{\n  content:'';width:6px;height:6px;border-radius:50%;\n  background:var(--primary);\n}\n.hxc-hero2-pin-a{background:rgba(254,243,199,.95);color:var(--amb);}\n.hxc-hero2-pin-a::before{background:var(--amb);}\n.hxc-hero2-pin-t{background:rgba(204,251,241,.95);color:var(--accent);}\n.hxc-hero2-pin-t::before{background:var(--accent);}\n.hxc-hero2-pin-1{top:24%;left:6%;}\n.hxc-hero2-pin-2{top:50%;right:8%;}\n.hxc-hero2-pin-3{bottom:28%;left:12%;}\n\n.hxc-hero2-chips{\n  position:absolute;left:18px;right:18px;bottom:18px;\n  display:grid;grid-template-columns:repeat(3,1fr);gap:10px;\n  z-index:3;\n}\n.hxc-hero2-chip{\n  padding:12px 14px;\n  background:rgba(255,255,255,.06);\n  border:1px solid rgba(255,255,255,.12);\n  border-radius:10px;\n  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);\n}\n.hxc-hero2-chip-v{\n  font-family:var(--hd);\n  font-size:13px;font-weight:700;\n  color:#fff;line-height:1.15;\n}\n.hxc-hero2-chip-v span{font-size:10px;font-weight:600;}\n.hxc-hero2-chip-l{\n  font-family:var(--mn);\n  font-size:8px;color:rgba(255,255,255,.55);\n  letter-spacing:1.5px;text-transform:uppercase;\n  margin-top:4px;\n}\n\n\/* STATS *\/\n.hxc-stats{background:var(--card);border-bottom:.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:.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\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);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;transition:transform .45s}\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),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:700;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}\n.hxc-b{grid-column:span 4;min-height:164px}\n.hxc-c{grid-column:span 3;min-height:164px}\n.hxc-d{grid-column:span 3;min-height:164px}\n.hxc-e{grid-column:span 4;min-height:164px}\n.hxc-f{grid-column:span 5;min-height:164px}\n.hxc-gg7{grid-column:span 4;min-height:164px}\n.hxc-gg8{grid-column:span 3;min-height:164px}\n\n\/* APPLICATIONS *\/\n.hxc-apg{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}\n.hxc-apc{background:var(--card);border:.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:700;margin-bottom:5px}\n.hxc-apd{font-size:12px;color:var(--muted);line-height:1.55}\n\n\/* PROCESS *\/\n.hxc-psg{display:grid;grid-template-columns:repeat(4,1fr);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:700;margin-bottom:7px}\n.hxc-psd{font-size:12px;color:var(--muted);line-height:1.65;max-width:180px}\n\n\/* TESTIMONIALS *\/\n.hxc-tsg{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}\n.hxc-tsi{background:var(--card);border:.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:.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\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:.5px solid #E8EDF2}\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 .25s}\n.hxc-faq-q:hover{color:var(--primary)}\n.hxc-faq-q.open{color:var(--primary)}\n.hxc-faq-icon{width:22px;height:22px;border-radius:50%;background:var(--surface);border:.5px solid var(--border);display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:14px;line-height:1;transition:all .3s;color:var(--muted)}\n.hxc-faq-q.open .hxc-faq-icon{background:#DBEAFE;border-color:var(--primary);color:var(--primary);transform:rotate(45deg)}\n.hxc-faq-body{display:none;padding:0 0 18px;font-size:13px;color:var(--muted);line-height:1.8}\n.hxc-faq-body.open{display:block;animation:hxc-fi2 .2s ease}\n@keyframes hxc-fi2{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}\n.hxc-faq-body strong{color:#374151;font-weight:500}\n\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:900;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;margin-left:auto;margin-right:auto}\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\n.hxc-rv{opacity:0;transform:translateY(18px);transition:opacity .5s ease,transform .5s ease}\n.hxc-rv.in{opacity:1;transform:none}\n\n@media(max-width:1050px){\n  .hxc-hero2-grid{grid-template-columns:1fr;min-height:auto;}\n  .hxc-hero2-L{padding:64px 0 32px;border-right:none;}\n  .hxc-hero2-R{padding:0 0 48px;}\n}\n@media(max-width:1024px){\n  .hxc-inner,.hxc-sg{padding:0 32px}\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-apg,.hxc-tsg{grid-template-columns:repeat(2,1fr)}\n}\n@media(max-width:768px){\n  .hxc-inner,.hxc-sg{padding:0 20px}\n  .hxc-s,.hxc-s-sf,.hxc-s-cd{padding:52px 0}\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}\n  .hxc-st:nth-child(3){border-right:.5px solid var(--border)}\n  .hxc-psg{grid-template-columns:1fr 1fr;gap:32px}\n  .hxc-psg::before{display:none}\n  .hxc-faq-grid{grid-template-columns:1fr}\n  .hxc-apg,.hxc-tsg{grid-template-columns:1fr}\n  .hxc-cta{padding:56px 20px}\n  .hxc-hero2-pin-1,.hxc-hero2-pin-3{display:none;}\n}\n@media(max-width:480px){\n  .hxc-ctabs{flex-direction:column;align-items:stretch}\n  .hxc-btn{justify-content:center;width:100%}\n  .hxc-hero2-stats{grid-template-columns:1fr 1fr;}\n  .hxc-hero2-chips{grid-template-columns:1fr;}\n}\n<\/style>\n\n<div class=\"hxc-wrap\">\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     HERO \u2014 ALS-style technical board\n     re-skinned for Internal Spline Sleeves\n\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<section class=\"hxc-hero2\">\n  <div class=\"hxc-hero2-stripe\"><\/div>\n  <div class=\"hxc-inner\">\n    <div class=\"hxc-hero2-grid\">\n\n      <!-- LEFT -->\n      <div class=\"hxc-hero2-L\">\n        <div class=\"hxc-hero2-flag\">\n          <div class=\"hxc-hero2-badge\">Product Category<\/div>\n          <div class=\"hxc-hero2-badge hxc-hero2-badge-amb\">Broached &amp; Plug-Gauged<\/div>\n          <div class=\"hxc-hero2-id\">ISP \/ 001 \u2014 003<\/div>\n        <\/div>\n        <h1 class=\"hxc-hero2-h1\">\n          Custom Internal Spline Sleeves<br><em>Broached, Shaped &amp; Ground<\/em>\n        <\/h1>\n        <p class=\"hxc-hero2-sub\">High-precision internal spline sleeves, internal spline hubs, and couplings \u2014 internal involute and flat-root spline profiles to DIN 5480, ISO 4156, and ANSI B92.1. Internal spline cutting by broaching, shaping, and grinding. Bore \u00d88\u2013400 mm, 100% go\/no-go gauged, CMM verified. Automotive, aerospace, and hydraulic applications.<\/p>\n        <div class=\"hxc-hero2-stats\">\n          <div class=\"hxc-hero2-stat\"><div class=\"hxc-hero2-stat-v\">\u00b10.006<sup>mm<\/sup><\/div><div class=\"hxc-hero2-stat-l\">Tooth Tolerance<\/div><\/div>\n          <div class=\"hxc-hero2-stat\"><div class=\"hxc-hero2-stat-v\">\u00d88\u2013400<\/div><div class=\"hxc-hero2-stat-l\">Bore Range<\/div><\/div>\n          <div class=\"hxc-hero2-stat\"><div class=\"hxc-hero2-stat-v\">100%<\/div><div class=\"hxc-hero2-stat-l\">Plug Gauged<\/div><\/div>\n        <\/div>\n        <div class=\"hxc-hero2-btns\">\n          <a href=\"#hxc-cta\" class=\"hxc-btn hxc-p\">Get Instant Quote <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>\n\n      <!-- RIGHT \u2014 dark technical board -->\n      <div class=\"hxc-hero2-R\">\n        <div class=\"hxc-hero2-board\">\n\n          <div class=\"hxc-hero2-ribbon\">\n            <span><span class=\"dot\"><\/span>PART DWG \u00b7 ISP-000 INTERNAL SPLINE SLEEVE<\/span>\n            <span>ISO 9001 : 2015<\/span>\n          <\/div>\n\n          <div class=\"hxc-hero2-pin hxc-hero2-pin-a hxc-hero2-pin-1\">DIN 5480 \u00b7 7H<\/div>\n          <div class=\"hxc-hero2-pin hxc-hero2-pin-2\">Broached \u00b7 m1.5 \u00b7 Z=30<\/div>\n          <div class=\"hxc-hero2-pin hxc-hero2-pin-t hxc-hero2-pin-3\">GO \/ NO-GO Verified<\/div>\n\n          <div class=\"hxc-hero2-scene\">\n            <svg viewBox=\"0 0 480 360\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-label=\"Internal spline sleeve technical drawing \u2014 sectioned side view, end view, and plug gauge mating detail\">\n              <defs>\n                <linearGradient id=\"ispMetal\" x1=\"0\" y1=\"0\" x2=\"0\" y2=\"1\">\n                  <stop offset=\"0\" stop-color=\"#E2E8F0\"\/>\n                  <stop offset=\".5\" stop-color=\"#CBD5E1\"\/>\n                  <stop offset=\"1\" stop-color=\"#64748B\"\/>\n                <\/linearGradient>\n                <linearGradient id=\"ispMetalDark\" x1=\"0\" y1=\"0\" x2=\"0\" y2=\"1\">\n                  <stop offset=\"0\" stop-color=\"#94A3B8\"\/>\n                  <stop offset=\"1\" stop-color=\"#334155\"\/>\n                <\/linearGradient>\n                <!-- hatching pattern for sectioned cut surfaces -->\n                <pattern id=\"ispHatch\" patternUnits=\"userSpaceOnUse\" width=\"6\" height=\"6\" patternTransform=\"rotate(45)\">\n                  <line x1=\"0\" y1=\"0\" x2=\"0\" y2=\"6\" stroke=\"#94A3B8\" stroke-width=\".5\"\/>\n                <\/pattern>\n              <\/defs>\n\n              <!-- \u2550\u2550\u2550 TOP: SECTIONED side view of internal spline sleeve (cylindrical hub cut in half lengthwise to reveal internal teeth) \u2550\u2550\u2550 -->\n              <g transform=\"translate(70,80)\">\n                <!-- outer cylinder profile (top half + bottom half) -->\n                <!-- sleeve body upper half \u2014 cut surface filled with hatch -->\n                <rect x=\"0\" y=\"-44\" width=\"220\" height=\"22\" fill=\"url(#ispMetal)\" stroke=\"#1E293B\" stroke-width=\"1.3\"\/>\n                <rect x=\"0\" y=\"-44\" width=\"220\" height=\"22\" fill=\"url(#ispHatch)\"\/>\n                <rect x=\"0\" y=\"-44\" width=\"220\" height=\"3\" fill=\"#F1F5F9\" opacity=\".7\"\/>\n                <!-- sleeve body lower half \u2014 same -->\n                <rect x=\"0\" y=\"22\" width=\"220\" height=\"22\" fill=\"url(#ispMetal)\" stroke=\"#1E293B\" stroke-width=\"1.3\"\/>\n                <rect x=\"0\" y=\"22\" width=\"220\" height=\"22\" fill=\"url(#ispHatch)\"\/>\n                <rect x=\"0\" y=\"22\" width=\"220\" height=\"3\" fill=\"#F1F5F9\" opacity=\".7\"\/>\n\n                <!-- inner bore visible (the gap in the middle, showing internal teeth profile from side) -->\n                <!-- top internal teeth (pointing DOWN into the bore, viewed in section) -->\n                <g fill=\"url(#ispMetalDark)\" stroke=\"#1E293B\" stroke-width=\".7\">\n                  <polygon points=\"6,-22 11,-12 14,-12 19,-22\"\/>\n                  <polygon points=\"19,-22 24,-12 27,-12 32,-22\"\/>\n                  <polygon points=\"32,-22 37,-12 40,-12 45,-22\"\/>\n                  <polygon points=\"45,-22 50,-12 53,-12 58,-22\"\/>\n                  <polygon points=\"58,-22 63,-12 66,-12 71,-22\"\/>\n                  <polygon points=\"71,-22 76,-12 79,-12 84,-22\"\/>\n                  <polygon points=\"84,-22 89,-12 92,-12 97,-22\"\/>\n                  <polygon points=\"97,-22 102,-12 105,-12 110,-22\"\/>\n                  <polygon points=\"110,-22 115,-12 118,-12 123,-22\"\/>\n                  <polygon points=\"123,-22 128,-12 131,-12 136,-22\"\/>\n                  <polygon points=\"136,-22 141,-12 144,-12 149,-22\"\/>\n                  <polygon points=\"149,-22 154,-12 157,-12 162,-22\"\/>\n                  <polygon points=\"162,-22 167,-12 170,-12 175,-22\"\/>\n                  <polygon points=\"175,-22 180,-12 183,-12 188,-22\"\/>\n                  <polygon points=\"188,-22 193,-12 196,-12 201,-22\"\/>\n                  <polygon points=\"201,-22 206,-12 209,-12 214,-22\"\/>\n                <\/g>\n                <!-- bottom internal teeth (pointing UP into the bore) -->\n                <g fill=\"url(#ispMetalDark)\" stroke=\"#1E293B\" stroke-width=\".7\">\n                  <polygon points=\"6,22 11,12 14,12 19,22\"\/>\n                  <polygon points=\"19,22 24,12 27,12 32,22\"\/>\n                  <polygon points=\"32,22 37,12 40,12 45,22\"\/>\n                  <polygon points=\"45,22 50,12 53,12 58,22\"\/>\n                  <polygon points=\"58,22 63,12 66,12 71,22\"\/>\n                  <polygon points=\"71,22 76,12 79,12 84,22\"\/>\n                  <polygon points=\"84,22 89,12 92,12 97,22\"\/>\n                  <polygon points=\"97,22 102,12 105,12 110,22\"\/>\n                  <polygon points=\"110,22 115,12 118,12 123,22\"\/>\n                  <polygon points=\"123,22 128,12 131,12 136,22\"\/>\n                  <polygon points=\"136,22 141,12 144,12 149,22\"\/>\n                  <polygon points=\"149,22 154,12 157,12 162,22\"\/>\n                  <polygon points=\"162,22 167,12 170,12 175,22\"\/>\n                  <polygon points=\"175,22 180,12 183,12 188,22\"\/>\n                  <polygon points=\"188,22 193,12 196,12 201,22\"\/>\n                  <polygon points=\"201,22 206,12 209,12 214,22\"\/>\n                <\/g>\n\n                <!-- pitch line indicator (dashed yellow) inside the bore -->\n                <line x1=\"0\" y1=\"-16\" x2=\"220\" y2=\"-16\" stroke=\"#FCD34D\" stroke-width=\".5\" stroke-dasharray=\"3 2\" opacity=\".7\"\/>\n                <line x1=\"0\" y1=\"16\" x2=\"220\" y2=\"16\" stroke=\"#FCD34D\" stroke-width=\".5\" stroke-dasharray=\"3 2\" opacity=\".7\"\/>\n\n                <!-- INTERNAL spline label bracket on top -->\n                <line x1=\"6\" y1=\"-58\" x2=\"214\" y2=\"-58\" stroke=\"#FCD34D\" stroke-width=\".8\" opacity=\".8\"\/>\n                <line x1=\"6\" y1=\"-58\" x2=\"6\" y2=\"-22\" stroke=\"#FCD34D\" stroke-width=\".4\" stroke-dasharray=\"2 2\" opacity=\".55\"\/>\n                <line x1=\"214\" y1=\"-58\" x2=\"214\" y2=\"-22\" stroke=\"#FCD34D\" stroke-width=\".4\" stroke-dasharray=\"2 2\" opacity=\".55\"\/>\n                <text x=\"110\" y=\"-62\" font-family=\"Roboto Mono,monospace\" font-size=\"8\" fill=\"#FCD34D\" text-anchor=\"middle\">INTERNAL SPLINE \u00b7 DIN 5480 \u00b7 m1.5 \u00b7 Z=30 \u00b7 30\u00b0PA \u00b7 7H<\/text>\n\n                <!-- centerline through bore -->\n                <line x1=\"-10\" y1=\"0\" x2=\"232\" y2=\"0\" stroke=\"#FCD34D\" stroke-width=\".7\" stroke-dasharray=\"6 2 2 2\" opacity=\".6\"\/>\n\n                <!-- bore diameter dimension -->\n                <g stroke=\"#60A5FA\" stroke-width=\".7\" fill=\"none\">\n                  <line x1=\"-4\" y1=\"-22\" x2=\"-4\" y2=\"22\"\/>\n                  <path d=\"M-4,-22 l-3,4 l6,0 z\" fill=\"#60A5FA\"\/>\n                  <path d=\"M-4,22 l-3,-4 l6,0 z\" fill=\"#60A5FA\"\/>\n                <\/g>\n                <text x=\"-12\" y=\"3\" font-family=\"Roboto Mono,monospace\" font-size=\"7\" fill=\"#93C5FD\" text-anchor=\"end\">\u230055<\/text>\n\n                <!-- OD dimension -->\n                <g stroke=\"#60A5FA\" stroke-width=\".7\" fill=\"none\">\n                  <line x1=\"226\" y1=\"-44\" x2=\"226\" y2=\"44\"\/>\n                  <path d=\"M226,-44 l-3,4 l6,0 z\" fill=\"#60A5FA\"\/>\n                  <path d=\"M226,44 l-3,-4 l6,0 z\" fill=\"#60A5FA\"\/>\n                <\/g>\n                <text x=\"234\" y=\"3\" font-family=\"Roboto Mono,monospace\" font-size=\"7\" fill=\"#93C5FD\">\u230085<\/text>\n\n                <!-- length dimension below -->\n                <g stroke=\"#60A5FA\" stroke-width=\".7\" fill=\"none\">\n                  <line x1=\"0\" y1=\"58\" x2=\"220\" y2=\"58\"\/>\n                  <path d=\"M0,58 l4,-3 l0,6 z\" fill=\"#60A5FA\"\/>\n                  <path d=\"M220,58 l-4,-3 l0,6 z\" fill=\"#60A5FA\"\/>\n                <\/g>\n                <text x=\"110\" y=\"68\" font-family=\"Roboto Mono,monospace\" font-size=\"7\" fill=\"#93C5FD\" text-anchor=\"middle\">L = 40 mm \u00b7 BROACHED \u00b7 INDUCTION HARDENED HRC 55<\/text>\n              <\/g>\n\n              <!-- \u2550\u2550\u2550 BOTTOM LEFT: end view (front face \u2014 full annular ring with internal teeth around bore) \u2550\u2550\u2550 -->\n              <g transform=\"translate(80,260)\">\n                <!-- outer ring -->\n                <circle cx=\"0\" cy=\"0\" r=\"50\" fill=\"url(#ispMetal)\" stroke=\"#1E293B\" stroke-width=\"1.2\"\/>\n                <!-- inner bore (showing internal teeth around it) -->\n                <circle cx=\"0\" cy=\"0\" r=\"28\" fill=\"#0F172A\" stroke=\"#1E293B\" stroke-width=\"1\"\/>\n\n                <!-- internal teeth (pointing INWARD toward center, around bore) -->\n                <g fill=\"url(#ispMetalDark)\" stroke=\"#1E293B\" stroke-width=\".55\">\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(0 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(12 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(24 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(36 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(48 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(60 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(72 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(84 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(96 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(108 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(120 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(132 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(144 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(156 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(168 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(180 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(192 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(204 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(216 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(228 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(240 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(252 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(264 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(276 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(288 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(300 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(312 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(324 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(336 0 0)\"\/>\n                  <rect x=\"-3\" y=\"-32\" width=\"6\" height=\"6\" transform=\"rotate(348 0 0)\"\/>\n                <\/g>\n\n                <!-- pitch circle (dashed) -->\n                <circle cx=\"0\" cy=\"0\" r=\"32\" fill=\"none\" stroke=\"#FCD34D\" stroke-width=\".5\" stroke-dasharray=\"3 2\" opacity=\".55\"\/>\n\n                <!-- centerlines -->\n                <line x1=\"-58\" y1=\"0\" x2=\"58\" y2=\"0\" stroke=\"#FCD34D\" stroke-width=\".5\" stroke-dasharray=\"6 2 2 2\" opacity=\".5\"\/>\n                <line x1=\"0\" y1=\"-58\" x2=\"0\" y2=\"58\" stroke=\"#FCD34D\" stroke-width=\".5\" stroke-dasharray=\"6 2 2 2\" opacity=\".5\"\/>\n\n                <!-- over-ball (between-pin) measurement marker on internal spline (green) -->\n                <circle cx=\"0\" cy=\"-30\" r=\"2.4\" fill=\"none\" stroke=\"#22C55E\" stroke-width=\".8\"\/>\n                <circle cx=\"0\" cy=\"30\" r=\"2.4\" fill=\"none\" stroke=\"#22C55E\" stroke-width=\".8\"\/>\n                <line x1=\"0\" y1=\"-30\" x2=\"0\" y2=\"30\" stroke=\"#22C55E\" stroke-width=\".5\" stroke-dasharray=\"2 2\" opacity=\".7\"\/>\n                <text x=\"0\" y=\"80\" font-family=\"Roboto Mono,monospace\" font-size=\"8\" fill=\"#FCD34D\" text-anchor=\"middle\">END VIEW \u00b7 BTW PIN MSR<\/text>\n              <\/g>\n\n              <!-- \u2550\u2550\u2550 BOTTOM RIGHT: GO plug gauge mating into the internal spline (the inspection signature for internal splines) \u2550\u2550\u2550 -->\n              <g transform=\"translate(220,200)\">\n                <rect x=\"0\" y=\"0\" width=\"220\" height=\"120\" fill=\"rgba(15,23,42,.4)\" stroke=\"#475569\" stroke-width=\"1\" stroke-dasharray=\"4 3\" rx=\"6\"\/>\n                <text x=\"10\" y=\"14\" font-family=\"Roboto Mono,monospace\" font-size=\"8\" fill=\"rgba(255,255,255,.55)\" letter-spacing=\"1\">DETAIL \u00b7 GO \/ NO-GO PLUG GAUGE<\/text>\n\n                <!-- Sectioned hub on left, plug gauge being inserted from right -->\n                <g transform=\"translate(15,68)\">\n                  <!-- hub outline (sectioned, walls only \u2014 top + bottom) -->\n                  <rect x=\"0\" y=\"-26\" width=\"80\" height=\"10\" fill=\"url(#ispMetal)\" stroke=\"#1E293B\" stroke-width=\".9\"\/>\n                  <rect x=\"0\" y=\"-26\" width=\"80\" height=\"10\" fill=\"url(#ispHatch)\"\/>\n                  <rect x=\"0\" y=\"16\" width=\"80\" height=\"10\" fill=\"url(#ispMetal)\" stroke=\"#1E293B\" stroke-width=\".9\"\/>\n                  <rect x=\"0\" y=\"16\" width=\"80\" height=\"10\" fill=\"url(#ispHatch)\"\/>\n                  <!-- internal teeth top + bottom (smaller) -->\n                  <g fill=\"url(#ispMetalDark)\" stroke=\"#1E293B\" stroke-width=\".4\">\n                    <polygon points=\"4,-16 7,-10 9,-10 12,-16\"\/>\n                    <polygon points=\"12,-16 15,-10 17,-10 20,-16\"\/>\n                    <polygon points=\"20,-16 23,-10 25,-10 28,-16\"\/>\n                    <polygon points=\"28,-16 31,-10 33,-10 36,-16\"\/>\n                    <polygon points=\"36,-16 39,-10 41,-10 44,-16\"\/>\n                    <polygon points=\"44,-16 47,-10 49,-10 52,-16\"\/>\n                    <polygon points=\"52,-16 55,-10 57,-10 60,-16\"\/>\n                    <polygon points=\"60,-16 63,-10 65,-10 68,-16\"\/>\n                    <polygon points=\"68,-16 71,-10 73,-10 76,-16\"\/>\n                  <\/g>\n                  <g fill=\"url(#ispMetalDark)\" stroke=\"#1E293B\" stroke-width=\".4\">\n                    <polygon points=\"4,16 7,10 9,10 12,16\"\/>\n                    <polygon points=\"12,16 15,10 17,10 20,16\"\/>\n                    <polygon points=\"20,16 23,10 25,10 28,16\"\/>\n                    <polygon points=\"28,16 31,10 33,10 36,16\"\/>\n                    <polygon points=\"36,16 39,10 41,10 44,16\"\/>\n                    <polygon points=\"44,16 47,10 49,10 52,16\"\/>\n                    <polygon points=\"52,16 55,10 57,10 60,16\"\/>\n                    <polygon points=\"60,16 63,10 65,10 68,16\"\/>\n                    <polygon points=\"68,16 71,10 73,10 76,16\"\/>\n                  <\/g>\n\n                  <!-- plug gauge (green, with handle) being inserted from right side, partially mating -->\n                  <g>\n                    <!-- gauge body (cylinder with external teeth) -->\n                    <rect x=\"42\" y=\"-12\" width=\"76\" height=\"24\" fill=\"rgba(34,197,94,.18)\" stroke=\"#22C55E\" stroke-width=\".9\"\/>\n                    <!-- external teeth on gauge top edge (matching the internal teeth above) -->\n                    <g fill=\"rgba(34,197,94,.3)\" stroke=\"#22C55E\" stroke-width=\".4\">\n                      <polygon points=\"44,-12 47,-18 49,-18 52,-12\"\/>\n                      <polygon points=\"52,-12 55,-18 57,-18 60,-12\"\/>\n                      <polygon points=\"60,-12 63,-18 65,-18 68,-12\"\/>\n                      <polygon points=\"68,-12 71,-18 73,-18 76,-12\"\/>\n                      <polygon points=\"76,-12 79,-18 81,-18 84,-12\"\/>\n                    <\/g>\n                    <!-- bottom edge -->\n                    <g fill=\"rgba(34,197,94,.3)\" stroke=\"#22C55E\" stroke-width=\".4\">\n                      <polygon points=\"44,12 47,18 49,18 52,12\"\/>\n                      <polygon points=\"52,12 55,18 57,18 60,12\"\/>\n                      <polygon points=\"60,12 63,18 65,18 68,12\"\/>\n                      <polygon points=\"68,12 71,18 73,18 76,12\"\/>\n                      <polygon points=\"76,12 79,18 81,18 84,12\"\/>\n                    <\/g>\n                    <!-- gauge handle -->\n                    <rect x=\"118\" y=\"-5\" width=\"22\" height=\"10\" fill=\"#22C55E\" opacity=\".75\"\/>\n                    <text x=\"129\" y=\"2\" font-family=\"Roboto Mono,monospace\" font-size=\"6\" fill=\"#fff\" text-anchor=\"middle\">GO<\/text>\n                    <!-- arrow showing insertion direction -->\n                    <line x1=\"118\" y1=\"0\" x2=\"92\" y2=\"0\" stroke=\"#22C55E\" stroke-width=\".7\" stroke-dasharray=\"2 2\"\/>\n                    <path d=\"M92,0 l4,-2 l0,4 z\" fill=\"#22C55E\"\/>\n                  <\/g>\n\n                  <!-- centerline through gauge + hub -->\n                  <line x1=\"-4\" y1=\"0\" x2=\"144\" y2=\"0\" stroke=\"#FCD34D\" stroke-width=\".5\" stroke-dasharray=\"6 2 2 2\" opacity=\".5\"\/>\n                <\/g>\n\n                <text x=\"110\" y=\"106\" font-family=\"Roboto Mono,monospace\" font-size=\"7\" fill=\"rgba(255,255,255,.55)\" text-anchor=\"middle\">100% INSPECTION \u00b7 EVERY PIECE<\/text>\n              <\/g>\n\n              <!-- top-right scale legend -->\n              <text x=\"468\" y=\"32\" font-family=\"Roboto Mono,monospace\" font-size=\"8\" fill=\"rgba(255,255,255,.4)\" text-anchor=\"end\" letter-spacing=\"1\">SCALE 1 : 2 \u00b7 MM<\/text>\n            <\/svg>\n          <\/div>\n\n          <div class=\"hxc-hero2-chips\">\n            <div class=\"hxc-hero2-chip\"><div class=\"hxc-hero2-chip-v\">DIN 5480 \u00b7 ISO 4156 \u00b7 SAE J498<\/div><div class=\"hxc-hero2-chip-l\">Standards<\/div><\/div>\n            <div class=\"hxc-hero2-chip\"><div class=\"hxc-hero2-chip-v\">Broach \u00b7 Shape \u00b7 Grind<\/div><div class=\"hxc-hero2-chip-l\">Process<\/div><\/div>\n            <div class=\"hxc-hero2-chip\"><div class=\"hxc-hero2-chip-v\">48<span>hr<\/span> Quote \u00b7 Matched Sets<\/div><div class=\"hxc-hero2-chip-l\">Service<\/div><\/div>\n          <\/div>\n\n        <\/div>\n      <\/div>\n\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- STATS -->\n<div class=\"hxc-stats\">\n  <div class=\"hxc-sg\">\n    <div class=\"hxc-st\"><div class=\"hxc-sn\">\u00b10.006mm<\/div><div class=\"hxc-sl2\">Internal Spline Tooth Tolerance<br>broached or shaped<\/div><\/div>\n    <div class=\"hxc-st\"><div class=\"hxc-sn\">\u00d88\u2013400mm<\/div><div class=\"hxc-sl2\">Bore Range<br>miniature to large hubs<\/div><\/div>\n    <div class=\"hxc-st\"><div class=\"hxc-sn\">100%<\/div><div class=\"hxc-sl2\">Internal Spline Gauge<br>go\/no-go, every piece<\/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>\n<\/div>\n\n<!-- GALLERY -->\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 Spline Sleeves We've Made<\/h2>\n        <p class=\"hxc-sub\">Broached, gear-shaped, and CNC internal spline cutting on internal spline hubs, internal splined sleeves, coupling sleeves, and internal spline bushings \u2014 for automotive transmissions, hydraulic pumps, robot joints, and aerospace actuators.<\/p>\n      <\/div>\n      <a href=\"#hxc-cta\" class=\"hxc-btn hxc-o\" style=\"flex-shrink:0\">Request Similar Part <span class=\"hxc-ar\">\u2192<\/span><\/a>\n    <\/div>\n    <div class=\"hxc-gg\">\n      <div class=\"hxc-gc hxc-a\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/04\/Internal-Spline-Hubs-scaled.webp\" alt=\"internal spline hub 42CrMo4 automotive transmission DIN 5480 broached internal involute spline\"><\/div>\n      <div class=\"hxc-gc hxc-b\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Internal-Ring-Gears5.png\" alt=\"internal spline coupling sleeve steel ISO 4156 hydraulic pump motor\"><\/div>\n      <div class=\"hxc-gc hxc-c\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Internal-Helical-Ring-Gear-\u2014-Robot-Joint.webp\" alt=\"stainless internal splined sleeve SUS316 internal helical spline cutting pharmaceutical pump\"><\/div>\n      <div class=\"hxc-gc hxc-d\"><img decoding=\"async\" src=\"https:\/\/hxcnc.com\/wp-content\/uploads\/2026\/05\/Internal-Ring-Gears3.webp\" alt=\"aluminum internal spline bushing robot joint lightweight anodized metric internal spline coupling\"><\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- PROCESS -->\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 Gauged Spline Sleeve<\/h2>\n      <p class=\"hxc-sub\" style=\"margin:0 auto\">Upload your internal spline sleeve drawing \u2014 spline standard, internal spline module, tooth count, internal spline pressure angle, fit class, and bore\/OD geometry. We handle internal spline cutting by broaching or shaping, hardening, and 100% inspection.<\/p>\n    <\/div>\n    <div class=\"hxc-psg\">\n      <div class=\"hxc-ps\"><div class=\"hxc-psn\">01<\/div><div class=\"hxc-pst\">Upload Drawing<\/div><div class=\"hxc-psd\">DIN 5480, ISO 4156, ANSI B92.1, or custom internal spline specifications. Specify fit class and all key dimensions.<\/div><\/div>\n      <div class=\"hxc-ps\"><div class=\"hxc-psn\">02<\/div><div class=\"hxc-pst\">Quote in 48h<\/div><div class=\"hxc-psd\">Internal spline manufacturing recommendation (broach vs shape), material, surface treatment, and firm lead time.<\/div><\/div>\n      <div class=\"hxc-ps\"><div class=\"hxc-psn\">03<\/div><div class=\"hxc-pst\">Machine &amp; Harden<\/div><div class=\"hxc-psd\">Turn blank \u2192 internal spline shaping or broaching \u2192 heat treat \u2192 internal spline grinding \u2192 surface treat.<\/div><\/div>\n      <div class=\"hxc-ps\"><div class=\"hxc-psn\">04<\/div><div class=\"hxc-pst\">100% Gauge &amp; Ship<\/div><div class=\"hxc-psd\">Every piece internal spline gauge checked. CMM internal spline measurement between pins on lot sample. Report with every shipment.<\/div><\/div>\n    <\/div>\n  <\/div>\n<\/div>\n<!-- TESTIMONIALS -->\n<div class=\"hxc-s-sf\">\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 Internal Spline Manufacturer<\/h2>\n    <\/div>\n    <div class=\"hxc-tsg\">\n      <div class=\"hxc-tsi hxc-rv\"><div class=\"hxc-tss\">\u2605\u2605\u2605\u2605\u2605<\/div><div class=\"hxc-tst\">\"3,000 pcs DIN 5480 internal spline hubs for our transmission programme. HXC provided 100% go\/no-go gauge data with every lot and CMM measurement between pins on each batch. Zero incoming rejects over 12 months. Their understanding of internal involute spline requirements is excellent.\"<\/div><div class=\"hxc-tshr\"><\/div><div class=\"hxc-tsau\"><div class=\"hxc-tsav\">BM<\/div><div><div class=\"hxc-tsnm\">Bruno M.<\/div><div class=\"hxc-tsco\">Transmission Supplier Quality \u00b7 Germany<\/div><\/div><\/div><\/div>\n      <div class=\"hxc-tsi hxc-rv\"><div class=\"hxc-tss\">\u2605\u2605\u2605\u2605\u2605<\/div><div class=\"hxc-tst\">\"We needed Al 7075 internal spline hubs with hard-anodized internal flanks for our robot joint \u2014 very tight fit class. HXC machined the pre-anodize tooth form undersize, anodized, then gauged every piece to confirm the final fit. All 80 pcs passed. Lead time 10 days.\"<\/div><div class=\"hxc-tshr\"><\/div><div class=\"hxc-tsau\"><div class=\"hxc-tsav\">HK<\/div><div><div class=\"hxc-tsnm\">Hiroshi K.<\/div><div class=\"hxc-tsco\">Robotics R&amp;D \u00b7 Japan<\/div><\/div><\/div><\/div>\n      <div class=\"hxc-tsi hxc-rv\"><div class=\"hxc-tss\">\u2605\u2605\u2605\u2605\u2605<\/div><div class=\"hxc-tst\">\"SUS316L internal spline coupling sleeves for a pharmaceutical fill-and-seal machine. DIN 5480 grade 7, passivated, with FDA-compatible material documentation. HXC understood the GMP documentation requirements and delivered everything we needed. On time, zero NCRs.\"<\/div><div class=\"hxc-tshr\"><\/div><div class=\"hxc-tsau\"><div class=\"hxc-tsav\">VR<\/div><div><div class=\"hxc-tsnm\">Valentina R.<\/div><div class=\"hxc-tsco\">Mechanical Engineer \u00b7 Italy<\/div><\/div><\/div><\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- FAQ -->\n<div class=\"hxc-s\" id=\"hxc-faq\">\n  <div class=\"hxc-inner\">\n    <span class=\"hxc-ey\">FAQ<\/span>\n    <h2 class=\"hxc-h2\">Internal Spline Sleeve \u2014 FAQ<\/h2>\n    <p class=\"hxc-sub\" style=\"margin-bottom:40px\">Common questions from engineers and buyers about internal spline sleeves, hubs, couplings, internal spline machining, and internal spline measurement.<\/p>\n    <div class=\"hxc-faq-grid\">\n      <div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">What is an internal spline sleeve?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">An internal spline sleeve (also called an internal spline hub or internal spline coupling) is a cylindrical part with <strong>internal spline teeth cut on its inner bore surface<\/strong> that mesh with matching external splines on a shaft to transmit torque. Unlike a simple keyed hub, an internal splined sleeve distributes torque across many teeth \u2014 giving higher torque capacity, better concentricity, and the ability to slide axially while transmitting torque. Internal spline sleeves are the female counterpart to external spline shafts in automotive synchroniser hubs, hydraulic pump-motor couplings, and robot joint actuators.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">How are internal spline sleeves manufactured?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">Internal spline manufacturing uses several main processes: <strong>(1) Broaching<\/strong> \u2014 a multi-tooth broach tool is pulled through the pre-machined bore in a single stroke, cutting all teeth simultaneously. Fastest internal spline cutting process for high volumes but requires a custom broach tool per profile. <strong>(2) Internal spline shaping<\/strong> \u2014 a reciprocating cutter generates teeth progressively; no custom tool needed, suitable for any tooth count, and can produce splines in blind bores or against shoulders. <strong>(3) Internal spline hobbing and 5-axis CNC internal spline cutting<\/strong> \u2014 for prototype quantities or non-standard profiles. <strong>(4) Rotary broach<\/strong> for short internal splines and small bores. For precision-class splines (DIN 5480 grade 5\u20136), an additional <strong>internal spline grinding<\/strong> step (or internal spline lapping) is added after hardening.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">What is the difference between broaching and shaping for internal spline cutting?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\"><strong>Broaching<\/strong>: fastest cycle time (seconds per part), excellent surface finish, consistent quality \u2014 but requires a custom broach tool (expensive, long lead time) that is specific to one tooth form. Economic only for volumes of 500+ pieces per profile. Cannot broach blind bores or splines against a shoulder. <strong>Internal spline shaping<\/strong>: uses a standard shaper cutter, no per-profile tooling cost, works in blind bores and against shoulders, can produce any tooth count \u2014 but slower cycle time. Better for low-to-medium volumes (1\u2013500 pcs), prototypes, and milling internal splines in complex housings. At HXC, we recommend broaching for volumes &gt;500 of a standard profile and gear shaping for all other internal spline machining cases.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">How do internal involute splines mate with external splines?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">The internal spline sleeve mating with the external spline shaft is an <strong>internal involute spline mesh<\/strong> \u2014 the same geometry as gear teeth. The fit between them is defined by the <strong>fit class<\/strong> in the standard (e.g., DIN 5480 shaft class f\/hub class H for sliding fit). The key parameters that must match between shaft and sleeve: <strong>internal spline module<\/strong>, <strong>tooth count<\/strong>, <strong>internal spline pressure angle<\/strong>, <strong>internal spline pitch diameter<\/strong>, and <strong>standard<\/strong> (DIN 5480 or ISO 4156 etc.). The fit class controls whether the assembly slides freely, is snug, or is a press fit. Always specify the shaft and hub fit classes together \u2014 mismatched classes are a common internal involute spline design error that causes either seizure or excessive backlash.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">What tolerances and dimensions apply to internal spline sleeves?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">DIN 5480 internal spline data defines internal spline (hub) dimensions and tolerances by a letter-number code: <strong>H<\/strong> (tolerance position) combined with a quality grade (5, 7, 9, etc.). Common hub tolerance designations: <strong>9H<\/strong> \u2014 general industrial sliding fit, widest tolerance, easiest to produce. <strong>7H<\/strong> \u2014 automotive standard, moderate tolerance, suitable for shaped + hardened production. <strong>5H<\/strong> \u2014 precision servo and aerospace, requires internal spline grinding after hardening. The internal spline dimensions \u2014 module, tooth count, pressure angle, major\/minor diameter and measurement between pins \u2014 must be specified alongside the mating shaft tolerance to define the complete spline fit. HXC produces all grades \u2014 our engineers confirm the appropriate grade for your application.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">Can internal spline sleeves have blind bores or integrated flanges?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">Yes \u2014 <strong>internal spline shaping<\/strong> is specifically suited to internal splines in blind bores (closed-bottom bores) because the shaper cutter reciprocates and can be retracted before hitting the bore bottom. Broaching requires a through-bore. Integrated flanges, bearing seats, oil ports, and mounting faces are all possible in the same internally splined sleeve \u2014 our 5-axis turning-milling centres complete all features in one setup, ensuring concentricity between the internal spline and all housing features. Common examples: transmission synchroniser hubs with integral shift-fork grooves; hydraulic internal spline coupling sleeves with integrated O-ring grooves; robot joint hubs with integrated bearing bores.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">What materials are best for internal spline sleeves?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\"><strong>42CrMo4<\/strong> (induction hardened, HRC 50\u201356) for automotive and industrial internal spline hubs \u2014 excellent fatigue resistance, predictable broaching behavior. <strong>20CrMnTi<\/strong> (carburized, HRC 58\u201362) for maximum contact fatigue strength in high-torque drive hubs. <strong>SUS316L stainless<\/strong> for food, pharmaceutical, and marine internal spline couplings. <strong>Al 7075-T6<\/strong> (hard-anodized) for lightweight robot joint hubs. <strong>Grade 5 titanium<\/strong> for aerospace spline sleeves. <strong>PEEK<\/strong> for medical and high-temperature sterilizable robot joint hubs. <strong>C45 \/ 1045<\/strong> for general-purpose, lower-cost industrial spline hubs where maximum hardness is not required. Internal metal tube spline and internally splined tubing are also available.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">How is internal spline measurement carried out?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">Internal spline measurement uses: <strong>(1) Internal spline gauge \u2014 go\/no-go plug gauges<\/strong> \u2014 the \"go\" plug (matching the mating shaft maximum material condition) must pass through; the \"no-go\" plug must not enter. This checks the total composite tolerance including profile, pitch, and concentricity in one functional test. <strong>(2) Internal spline measurement between pins (over-pin \/ over-ball)<\/strong> \u2014 two precision balls placed in opposite internal tooth spaces, dimension measured with a CMM or micrometer; directly measures effective space width. This is the standard method for measuring internal involute splines. <strong>(3) CMM with gear module<\/strong> \u2014 for precision grades (DIN 5480 grade 5\u20136), individual tooth profile, pitch, and concentricity are measured. HXC provides 100% go\/no-go gauging on all orders with CMM lot reports on precision grades.<\/div><\/div>\n      <\/div>\n      <div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">What is the difference between an internal spline and a keyway hub?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">A <strong>keyway hub<\/strong> uses a single rectangular slot \u2014 simple, low-cost, but: high stress concentration at the keyway corners; limited torque capacity; the hub rocks on the key, reducing concentricity; axial sliding causes keyway fretting. An <strong>internal spline hub<\/strong> distributes torque across all internal spline teeth simultaneously: far higher torque capacity per bore diameter; excellent concentricity (self-centering internal involute spline profile); smooth axial sliding without fretting if properly lubricated; much better torsional fatigue life. For applications above ~100 Nm, or requiring &lt;0.05 mm runout between shaft and hub, internal spline hubs are significantly superior to keyed hubs.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">Do internal spline sleeves require lubrication?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">It depends on the coupling type: <strong>Fixed couplings<\/strong> (no axial sliding in service): a one-time application of MoS\u2082 grease or anti-seize compound at assembly is sufficient. <strong>Sliding spline couplings<\/strong> (axial sliding under load, e.g., driveshaft yokes): require spline-specific NLGI 2 grease with MoS\u2082 or graphite, replenished per maintenance schedule. <strong>Gearbox internals<\/strong>: lubricated by transmission oil \u2014 ensure API GL-4 or GL-5 compatibility. <strong>Stainless and titanium spline sleeves<\/strong> (food, pharma, medical): run dry or with NSF H1 food-grade grease. <strong>Polymer spline sleeves<\/strong> (PEEK, POM): run dry in light-duty applications; no lubrication needed.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">What is fretting damage in internal spline couplings and how is it prevented?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">Fretting in internal spline couplings is micro-slip wear between internal and external spline flanks caused by cyclic torsional or axial loads with vibration \u2014 producing oxidized wear debris and eventually fretting fatigue cracks at tooth roots. More severe in the internal spline (hub) than in the external shaft because the hub tooth has lower bending stiffness. Prevention: <strong>(1) Tighter fit class<\/strong> \u2014 reduces micro-slip amplitude; <strong>(2) Surface hardening<\/strong> \u2014 hard flanks resist micro-slip abrasion; <strong>(3) MoS\u2082 grease<\/strong> at assembly \u2014 reduces friction coefficient of micro-slip contacts; <strong>(4) Shot peening<\/strong> of internal tooth roots \u2014 compressive residual stress resists crack initiation; <strong>(5) Increase engagement length<\/strong> \u2014 longer spline face distributes the load and reduces unit fretting stress.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">What standards apply to internal involute splines (DIN 5480, ISO 4156, SAE J498)?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">Several standards govern internal involute splines. <strong>DIN 5480<\/strong> is the dominant European internal involute spline standard, defining metric internal spline coupling geometry by module, tooth count and 30\u00b0 pressure angle. <strong>ISO 4156<\/strong> is the international standard for involute internal splines, harmonising metric flank-fit spline data globally. <strong>ANSI B92.1<\/strong> covers the inch-series involute internal splines used in North America. <strong>SAE J498<\/strong> defines flat-root internal splines (straight-sided \"SAE splines\") with diametral pitches from 8\/16 to 32\/64, widely used in mobile hydraulics where pump-motor couplings must be interchangeable. HXC produces internal spline sleeves to all of these \u2014 specify the standard, module or diametral pitch, and tooth count on your drawing.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">What is the lead time for custom internal spline sleeves?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">Lead times: <strong>Prototype (1\u20135 pcs), gear shaped, DIN 5480 grade 7<\/strong>: 5\u20138 days. <strong>Small batch (20\u2013100 pcs), shaped + hardened + gauged<\/strong>: 8\u201314 days. <strong>Production (500\u20135,000 pcs), broached + hardened<\/strong>: 10\u201316 days (after first-article broach approval). <strong>Precision grade (DIN 5480 grade 5\u20136, internal spline grinding)<\/strong>: 14\u201322 days. <strong>Stainless or titanium<\/strong>: add 3\u20135 days. Rush production available. Note: first-time broaching orders require 5\u20137 days additional lead time for broach tool manufacturing \u2014 subsequent orders use the stored tool.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">Can HXC supply matched shaft and sleeve sets?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">Yes \u2014 HXC regularly supplies <strong>matched internal spline sleeve and external spline shaft sets<\/strong> from the same production batch, gauged together to confirm the target fit class (sliding, transition, or press). Supplying both halves from the same internal spline manufacturer eliminates the tolerance stack risk when sourcing shaft and hub separately \u2014 the shaft f-tolerance and hub H-tolerance are produced to complementary targets that together achieve the specified backlash. Matched sets are bagged together with a single inspection report showing both shaft and hub measurement-between-pins results and the calculated assembly fit class. This service is particularly popular for automotive transmission and hydraulic pump-motor coupling programmes.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">What is the torque capacity of a DIN 5480 internal spline hub?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">DIN 5480 internal spline hub torque capacity depends on <strong>spline bore diameter, internal spline module, tooth count, face width, and material hardness<\/strong>. As a practical guide: a DIN 5480 hub with m1.5 \/ 30T \/ \u00d855 mm bore \/ 30 mm face width in 42CrMo4 (induction hardened, HRC 52) transmits approximately <strong>800\u20131,200 Nm<\/strong> continuously. Capacity scales approximately with bore diameter cubed for the same module. Key design limits are tooth shear stress, contact (Hertzian) stress at the tooth flank, and fretting fatigue at the tooth root under cyclic loading. HXC engineers calculate spline capacity and recommend module, tooth count, and face width for your application torque and cycle life as part of the free DFM review.<\/div><\/div>\n        <div class=\"hxc-faq-item\"><button class=\"hxc-faq-q\" onclick=\"hxcFaq(this)\">What is the minimum wall thickness for an internal spline sleeve?<span class=\"hxc-faq-icon\">+<\/span><\/button><div class=\"hxc-faq-body\">The minimum wall thickness (from the root circle of the internal spline teeth to the OD of the sleeve) should be at least <strong>2\u20132.5\u00d7 the internal spline module<\/strong> to avoid distortion during heat treatment and to provide adequate hoop strength. For thin-wall internal spline bushings, heat treatment distortion is the primary concern \u2014 internal spline shaping before heat treatment and internal spline grinding after is the safest approach. For very thin-wall applications (wall\/module &lt;2), consider nitriding instead of carburizing \u2014 nitriding operates at lower temperature (520\u00b0C vs 900\u00b0C) with far less dimensional distortion, and no quench distortion. HXC flags thin-wall concerns as part of the free DFM review for every internal spline sleeve order.<\/div><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n<\/div>\n\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n  {\"@type\":\"Question\",\"name\":\"What is an internal spline sleeve?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"An internal spline sleeve (spline hub) is a cylindrical part with teeth on its inner bore surface that mesh with external splines on a shaft to transmit torque. It distributes torque across many teeth, giving higher torque capacity, better concentricity, and the ability to slide axially while transmitting torque.\"}},\n  {\"@type\":\"Question\",\"name\":\"How are internal spline sleeves manufactured?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"By three main processes: (1) Broaching \u2014 a multi-tooth tool cuts all teeth in one stroke; fast for high volumes but requires a custom tool. (2) Gear shaping \u2014 a reciprocating cutter generates teeth progressively; no custom tooling, works in blind bores, suitable for any volume. (3) 5-axis CNC milling for prototypes. Precision grades require internal tooth grinding after hardening.\"}},\n  {\"@type\":\"Question\",\"name\":\"What is the difference between broaching and gear shaping for internal splines?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Broaching: fastest, excellent finish, but requires expensive custom tooling per profile \u2014 economic for 500+ pieces. Cannot do blind bores. Gear shaping: uses standard cutter, no custom tooling, works in blind bores and against shoulders, suitable for 1\u2013500 pcs and prototypes.\"}},\n  {\"@type\":\"Question\",\"name\":\"What tolerances apply to internal spline sleeves?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"DIN 5480 hub tolerances: 9H for general industrial. 7H for automotive standard. 5H for precision servo and aerospace (requires internal tooth grinding). The hub tolerance must be specified with the mating shaft tolerance to define the complete spline fit.\"}},\n  {\"@type\":\"Question\",\"name\":\"What materials are best for internal spline sleeves?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"42CrMo4 (induction hardened) for automotive and industrial. 20CrMnTi (carburized) for maximum contact fatigue. SUS316L for food\/pharma\/marine. Al 7075-T6 (hard-anodized) for lightweight robotics. Grade 5 titanium for aerospace. PEEK for medical\/sterilizable applications.\"}},\n  {\"@type\":\"Question\",\"name\":\"What is the lead time for custom internal spline sleeves?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Prototype (1\u20135 pcs, gear shaped): 5\u20138 days. Small batch (20\u2013100 pcs, shaped + hardened): 8\u201314 days. Production (500\u20135,000 pcs, broached): 10\u201316 days. Precision grade (internal tooth grinding): 14\u201322 days. First-time broaching orders add 5\u20137 days for tool manufacturing.\"}}\n]}\n<\/script>\n\n<script>\nfunction hxcFaq(btn){\n  const body=btn.nextElementSibling,isOpen=btn.classList.contains('open');\n  btn.classList.toggle('open',!isOpen);\n  btn.setAttribute('aria-expanded',String(!isOpen));\n  body.classList.toggle('open',!isOpen);\n}\nconst hxcObs=new IntersectionObserver(entries=>{\n  entries.forEach((e,i)=>{\n    if(e.isIntersecting)setTimeout(()=>e.target.classList.add('in'),i*90);\n  });\n},{threshold:.08});\ndocument.querySelectorAll('.hxc-rv').forEach(el=>hxcObs.observe(el));\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-709c6818 e-con-full e-flex e-con e-parent\" data-id=\"709c6818\" data-element_type=\"container\" data-e-type=\"container\" id=\"hxc-cta\">\n\t\t<div class=\"elementor-element elementor-element-442700fb e-con-full e-flex e-con e-child\" data-id=\"442700fb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2aaa92bb elementor-widget elementor-widget-html\" data-id=\"2aaa92bb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<!-- HXCNC CTA Left Panel | namespace .HXCL | Elementor HTML Widget -->\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Roboto:wght@300;400;500;700;900&family=Roboto+Condensed:wght@400;700;900&family=Roboto+Mono:wght@400;500&display=swap\" rel=\"stylesheet\">\n<style>\n.HXCL{\n  --bg:#F7F9FC;--wh:#FFFFFF;--lt:#EEF3F8;\n  --tx:#1F2937;--tx1:#5B6777;--tx2:#9CA8B4;--bd:#D7E0EA;\n  --a:#2563EB;--a2:#1D4ED8;--aA:rgba(37,99,235,.07);--aC:rgba(37,99,235,.20);\n  --ac:#0F766E;--acA:rgba(15,118,110,.08);--acB:rgba(15,118,110,.15);--acC:rgba(15,118,110,.22);\n  --fh:'Roboto 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Quote.<\/em>\n  <\/h2>\n\n  <p class=\"sub\">Every enquiry includes a DFM review \u2014 tolerance feasibility, material confirmation, and process approach confirmed before production starts. MOQ 1 piece.<\/p>\n\n  <!-- Stats row -->\n  <div class=\"stats\">\n    <div class=\"stat\">\n      <div class=\"sv\">24<small>hr<\/small><\/div>\n      <div class=\"sl\">Quote Response<\/div>\n    <\/div>\n    <div class=\"stat\">\n      <div class=\"sv\">MOQ <small>1<\/small><\/div>\n      <div class=\"sl\">Prototypes OK<\/div>\n    <\/div>\n    <div class=\"stat\">\n      <div class=\"sv\">ISO<\/div>\n      <div class=\"sl\">9001:2015<\/div>\n    <\/div>\n  <\/div>\n\n  <!-- Advantage list -->\n  <div class=\"avlist\">\n    <div class=\"avitem\">\n      <div class=\"ico\">&#128208;<\/div>\n      <div>\n        <div class=\"at\">DFM Review on Every Enquiry<\/div>\n        <div class=\"ad\">Tolerance feasibility, fixturing strategy, and material confirmation. Specific, actionable feedback \u2014 not generic pushback.<\/div>\n      <\/div>\n    <\/div>\n    <div class=\"avitem\">\n      <div class=\"ico\">&#127919;<\/div>\n      <div>\n        <div class=\"at\">First Article Inspection \u2014 Standard<\/div>\n        <div class=\"ad\">FAI report on every new run. Material certs and surface treatment certs included with every shipment.<\/div>\n      <\/div>\n    <\/div>\n    <div class=\"avitem\">\n      <div class=\"ico\">&#128260;<\/div>\n      <div>\n        <div class=\"at\">Same Process: Prototype to Production<\/div>\n        <div class=\"ad\">Process plan from your prototype applies to production batches. No re-qualification when you scale.<\/div>\n      <\/div>\n    <\/div>\n    <div class=\"avitem\">\n      <div class=\"ico\">&#9881;<\/div>\n      <div>\n        <div class=\"at\">3 \/ 4 \/ 5-Axis CNC + Turning<\/div>\n        <div class=\"ad\">Complex structural parts, shafts, housings, and transmission components. Metals and engineering plastics.<\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <!-- Cert tags -->\n  <div class=\"certs\">\n    <span class=\"cert hi\">ISO 9001:2015<\/span>\n    <span class=\"cert\">3\/4\/5-Axis Milling<\/span>\n    <span class=\"cert\">CNC Turning<\/span>\n    <span class=\"cert\">CMM Inspection<\/span>\n    <span class=\"cert\">Global Delivery<\/span>\n  <\/div>\n\n<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3407348b e-con-full e-flex e-con e-child\" data-id=\"3407348b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-55b7f332 elementor-button-align-stretch elementor-widget elementor-widget-form\" data-id=\"55b7f332\" 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=\"1016\"\/>\n\t\t\t<input type=\"hidden\" name=\"form_id\" value=\"55b7f332\"\/>\n\t\t\t<input type=\"hidden\" name=\"referer_title\" value=\"Internal Spline Sleeves | CNC Machined Spline Couplings | HXCNC\" \/>\n\n\t\t\t\t\t\t\t<input type=\"hidden\" name=\"queried_id\" value=\"1016\"\/>\n\t\t\t\n\t\t\t<div class=\"elementor-form-fields-wrapper elementor-labels-above\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-name elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-name\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tName\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"text\" name=\"form_fields[name]\" id=\"form-field-name\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Name\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-field_12786b6 elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-field_12786b6\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tCompany\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"text\" name=\"form_fields[field_12786b6]\" id=\"form-field-field_12786b6\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Company Name\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-email elementor-field-group elementor-column elementor-field-group-email elementor-col-100 elementor-field-required\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-email\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tEmail\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"email\" name=\"form_fields[email]\" id=\"form-field-email\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Email\" required=\"required\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-select elementor-field-group elementor-column elementor-field-group-field_0c79fc0 elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-field_0c79fc0\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tMaterial\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field elementor-select-wrapper remove-before \">\n\t\t\t<div class=\"select-caret-down-wrapper\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-eicon-caret-down\" viewBox=\"0 0 571.4 571.4\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M571 393Q571 407 561 418L311 668Q300 679 286 679T261 668L11 418Q0 407 0 393T11 368 36 357H536Q550 357 561 368T571 393Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t\t<select name=\"form_fields[field_0c79fc0]\" id=\"form-field-field_0c79fc0\" class=\"elementor-field-textual elementor-size-sm\">\n\t\t\t\t\t\t\t\t\t<option value=\"aluminium_6061_t6\">Aluminium 6061-T6<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"aluminium_7075_t6\">Aluminium 7075-T6<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"stainless_steel_304\">Stainless Steel 304<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"stainless_steel_316l\">Stainless Steel 316L<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"carbon_steel_4140\">Carbon Steel \/ 4140<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"titanium_ti_6al_4v\">Titanium Ti-6Al-4V<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"brass_c360\">Brass C360<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"copper\">Copper<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"peek\">PEEK<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"pom_acetal\">POM \/ Acetal<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"nylon_pa6_pa66\">Nylon PA6 \/ PA66<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"ptfe_teflon\">PTFE \/ Teflon<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"polycarbonate\">Polycarbonate<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"abs\">ABS<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"other_not_sure\">Other \/ Not sure<\/option>\n\t\t\t\t\t\t\t<\/select>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-select elementor-field-group elementor-column elementor-field-group-field_161b5ef elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-field_161b5ef\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tSurface Finish\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field elementor-select-wrapper remove-before \">\n\t\t\t<div class=\"select-caret-down-wrapper\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-eicon-caret-down\" viewBox=\"0 0 571.4 571.4\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M571 393Q571 407 561 418L311 668Q300 679 286 679T261 668L11 418Q0 407 0 393T11 368 36 357H536Q550 357 561 368T571 393Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t\t<select name=\"form_fields[field_161b5ef]\" id=\"form-field-field_161b5ef\" class=\"elementor-field-textual elementor-size-sm\">\n\t\t\t\t\t\t\t\t\t<option value=\"as_machined\">As-machined<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"anodised_type_ii\">Anodised Type II<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"anodised_type_iii_hard\">Anodised Type III (Hard)<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"electroplating\">Electroplating<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"powder_coating\">Powder Coating<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"black_oxide\">Black Oxide<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"passivation_ss\">Passivation (SS)<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"polishing_ra_requirement\">Polishing \/ Ra requirement<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"other_specify_below\">Other (specify below)<\/option>\n\t\t\t\t\t\t\t\t\t<option value=\"Select \">Select finish (optional)<\/option>\n\t\t\t\t\t\t\t<\/select>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-textarea elementor-field-group elementor-column elementor-field-group-message elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t<label for=\"form-field-message\" class=\"elementor-field-label\">\n\t\t\t\t\t\t\t\tAdditional Requirements\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t<textarea class=\"elementor-field-textual elementor-field  elementor-size-sm\" name=\"form_fields[message]\" id=\"form-field-message\" rows=\"4\" placeholder=\"Target delivery date, critical dimensions, tolerance callouts, inspection requirements, application 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involute and flat-root spline profiles to DIN 5480, ISO 4156, and ANSI B92.1. Internal spline cutting by broaching, shaping, and grinding. Bore \u00d88\u2013400 mm, 100% go\/no-go gauged, [&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-1016","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 Spline Sleeves | CNC Machined Spline Couplings | HXCNC<\/title>\n<meta name=\"description\" content=\"Precision CNC machined internal spline sleeves and couplings. 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