2 pieces 8 mm x 600 linear guide shaft, steel cylinder rail, optical axis for 3D printers, DIY, CNC metric h8 tolerance

High finish and straightness: the surface of the linear guide rods is treated by a special grinding and hard chrome plating technology and then highly polished. The surface is smooth, without cracks and even without bubbles. High hardness: C45 quality steel, high-frequency hardening, surface chrome plating (10um-20um). The case hardness can reach up to 57-62 HRC. Durable and corrosion resistant. High accuracy: diameter 10 m, tolerance -0.005 mm to -0.03 mm (7.995 mm - 7.97 mm), length 300 mm, tolerance ± 0.5 mm (599.5 mm - 600.5 mm). Humanisation design: chamfer on both ends, easier to install linear bearings and will not hurt your fingers when installing it. Box contents: 2 pieces 8 mm x 600 mm linear motion shaft. 30-day money back guarantee, 1-year warranty, 24/7 friendly customer service.