{"product_id":"12mm-x-400mm-linear-motion-rod-shaft-guide-chrome","title":"12mm x 400mm Linear Motion Rod Shaft Guide Chrome Plated and Case Hardened for 3D Printers CNC DIY Projects With Metric H8 Tolerance, 2 Pieces For Precise, Smooth Motion In Heavy Duty Builds","description":"\u003cdiv\u003e12mm x 400mm Linear Rail Shaft Pair for CNC \u0026amp; 3D Printers\u003cbr\u003e\n✔️ 2-piece chrome-plated, H8 tolerance, HRC58-64, ends chamfered \u003cp\u003eThese 12mm x 400mm linear rail shafts provide precise guidance for heavy-duty motion in CNC machines, 3D printers, and automated equipment. Sold as a pair to support paired axis drives.\u003c\/p\u003e ✅ Diameter x length: 12 mm x 400 mm\u003cbr\u003e\n✅ Material: carbon steel C45#\u003cbr\u003e\n✅ Hardness: 58-64 HRC (case hardened)\u003cbr\u003e\n✅ Chrome thickness: 15-20 μm\u003cbr\u003e\n✅ Surface roughness: Ra 0.8-1.6\u003cbr\u003e\n✅ Tolerance: H8\u003cbr\u003e\n✅ Straightness: ≤5 μm\/100 mm\u003cbr\u003e\n✅ Chamfered ends on both sides\u003cbr\u003e\n✅ Pack: 2 pieces\u003cbr\u003e \u003cp\u003e💡 What is a 12 mm x 400 mm linear rail shaft used for in CNC and 3D printer setups? This handy guide explains what these rails do and why they matter.\u003c\/p\u003e\n- Handy for guiding moving components in CNC machines and 3D printers\n- Delivers smooth motion with hardened steel and chrome plating for durability\n- Maintains tight tolerances to ensure repeatable positioning under load\n- Widely used in DIY CNC, milling, and 3D printer projects\n✝️\u003c\/div\u003e","brand":"Amazon","offers":[{"title":"Default Title","offer_id":49118288052459,"sku":"VXB096R5VCJN","price":62.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/3268\/0683\/files\/51Bb3HVzFVS_b50e2752-3b15-46a6-9fef-3412c96e40a0.jpg?v=1785180934","url":"https:\/\/vxb.com\/products\/12mm-x-400mm-linear-motion-rod-shaft-guide-chrome","provider":"VXB Bearings","version":"1.0","type":"link"}