Linear Motion Shaft Rod Guide D 12mm x L 7.87 inch / 200mm 4Pcs, Hollow Rod D 12mm Inner Hole 6mm Smooth Steel Case Hardened Chrome Plated for 3D Printer, DIY, CNC - h7 Tolerance

Specifications: Brand: MssoommMaterial: High Quality Carbon Steel (C45#)Hardness: 58-60 HRCSurface Hard-thickness: 0.8 – 2.5mmSurface Roughness: 0.8S – 1.6SStraightness: Below 5μm/100mmSurface Chrome Thickness: 15um-20umSurface Finish Quality: Ra 0.1 - 0.35Color: SilverThis items includ:4Pcs 12mm x 7.87 inch / 200mm hollow linear rail shaft rod with inner hole 6mmPlease Note: - We can offer the linear motion rail shaft rod in any length, pls contact us.- We can process the end of the rail as you need, some examples you can see the image 4

• Unlike solid linear shaft rod optical shafts, hollow linear rod can reduce weight and improve bending and torsional resistance, with better strength-to-density ratio and specific stiffness, suitable for CNC, 3D printer, automatic machinery, injection molding machine, engraving machine
• Tolerance: Metric h7, hardness about HRC 58-60, hardening depth: 0.8-3mm, straightness≤ 0.07/1000mm, chrome thickness: 0.015mm-0.02mm, roundness: no more than 3μm, surface roughness: ra0.1m - 0.35m
• Adapting C45 high quality carbon steel, high frequency quenching, surface chromium plating. Using mirror polishing technology, more durable and corrosion-resistant.
• Humanization Design: Chamfer on both ends, easier to install linear bearings and won't hurt fingers when installing it
• We can customize the linear rail, including the length and end processing, showed as image 4. With full series of diameters: 5, 6, 8, 10, 12, 13, 14, 16, 20, 25, 30, 35, 40, 50mm and so on, any special needs, please give us message