5mm X 50mm Hardened Steel Linear Shaft – 45# Smooth Rod For 3D Printer & CNC Optical Axis

If you're building or repairing a 3D printer, CNC router, or any linear motion rig, you need good, straight rods.

This one's a solid chunk of 45# hardened steel, precisely ground to a smooth finish.

It measures exactly 5mm in diameter and 50mm long—perfect for small linear bearings or bushings.

It's brand new and unbranded, but the quality is there where it counts: hardness and straightness.

Just a single shaft, but it's the backbone of smooth movement.