Linear Motion Rods 2PCS 8mmx 200mm (0.315 x 7.874inches) Case Hardened Chrome Plated Linear Motion Rod Shaft Guide for 3D Printer, DIY, CNC - Metric h8 Tolerance

Product description <img alt="Linear Motion Rods" src="https://m.media-amazon.com/images/S/aplus-media-library-service-media/f54680d8-ab68-4c8e-8e1c-c21ea198c108.__CR0,0,1940,1200_PT0_SX970_V1___.jpg"/> Material:C45 carbon steel（surface chromium plating(10um-20um） Hardness:57-62 HRC Diameter:6mm/8mm/10mm/12mm. tolerance -0.005mm to -0.03mm ( 7.995mm - 7.97mm) length:150mm/200mm/250mm/300mm/320mm/330mm/350mm/400mm/450mm/500mm/550mm/600mm/700mm/800mm(optional). tolerance ± 0.5mm ( 499.5mm - 500.5mm ) Ultra high smoothness The rods cut smooth surface without burr, surface mirror polishing treatment, smooth and beautiful, corrosion resistance and smooth operation. High stability Using 45# high carbon steel material, stable property, pure steel impurity content is low, the surface of hard chromium plating treatment, surface hardness of 57-62 HRC, Strong and durable, high stability and almost no noise. Easy to install Using both ends of the humanized chamfering treatment, easier to install linear bearings and won't hurt fingers when installing it.