12mm X 400mm Linear Motion Rods Set Of 2 For CNC, 3D Printers, And DIY Projects Hardened Chrome Steel Shafts With HRC55-62 Tolerance, Smooth Low-Wear Guide Rails For High-Speed Motion And Precise Repeats

12mm x 400mm Linear Motion Rods for Precision CNC Shafts
✔️ 12x400 mm, 45# steel, HRC55-62, chrome plated, 2-pack

These hardened linear motion shafts deliver smooth, repeatable guidance for moving parts in CNC machines, 3D printers, robotics, and automation projects. Ideal for stabilizing X/Y/Z axes, retrofitting machines, or DIY gantries.

✅ Material: 45# carbon steel
✅ Hardness: HRC55-62
✅ Surface roughness: Ra0.05-0.08
✅ Chrome thickness: 0.01 mm
✅ Diameter tolerance: -0.01 to -0.03 mm
✅ Length tolerance: ±0.1 mm
✅ Straightness: ≤0.1/1000 mm
✅ Finish: chrome plated, low friction
✅ Size: 12 mm diameter x 400 mm length (2-pack)

💡 What is a common use for a 12 mm diameter linear motion rod in CNC and 3D printers?

These rods are handy for guiding precise motion on straight axes.

- Handy for CoreXY and Cartesian printer frame upgrades.
- Useful in robotics and automation projects requiring repeatable motion.
- Works with standard LM8UU bearings and linear rails for easy retrofits.