Two Pack 8mm X 330mm Case Hardened Chrome Linear Rail Shaft Set for 3D Printers, CNC Machines and DIY Projects, Precision Metric H8 Tolerance, High Hardness 55-60 HRC, Durable Smooth Glide Guide Rods for Pro DIY Builds

Two Pack 8mm x 330mm Case-Hardened Chrome Linear Rails
✔️ 2 pcs 8mm x 330mm, 55-60 HRC chrome plated shafts

These 8mm diameter, 330mm long case-hardened chrome linear shafts provide precise guidance for motion in DIY projects and professional machines. They’re commonly used in 3D printers, CNC setups, engraving machines, and other automatic equipment where smooth glide and accurate alignment matter.

✅ 8 mm diameter, 330 mm length with ±0.5 mm tolerance (329.5-330.5 mm)
✅ Diameter tolerance: -0.005 to -0.03 mm (7.970-7.995 mm)
✅ Case hardened steel, hardness 55-60 HRC
✅ Chrome plating 10-20 μm for corrosion resistance
✅ Material: C45 steel for durability

💡 What is an 8mm linear shaft used for in precision machinery?

It provides a precise, straight guide for moving parts in DIY builds, used with bearings and blocks to ensure smooth, repeatable movement.

- It is used with 8 mm bearings and blocks for smooth linear motion in 3D printers, CNCs, and automation - The chrome finish resists corrosion and extends service life in demanding environments - Tight tolerances (±0.5 mm on length, 7.970-7.995 mm diameter) help repeatable positioning - Pair with 8 mm linear bearings and closed-type slide units for stable alignment ✝️