T8 Lead Screw 150mm Kit with Nut, Bracket and Coupling

A lead screw converts rotational motion into linear motion by way of a threaded screw turning through a matched nut - as the stepper motor spins the screw, the nut (attached to whatever needs to move) travels along its length at a precise, repeatable rate determined by the thread pitch. That precision is exactly why lead screws, not belts, drive the Z-axis on most 3D printers, where accuracy matters more than speed.

This kit bundles every part actually needed to get a lead screw axis running rather than requiring separate sourcing: the 150mm stainless steel screw itself, a brass-copper nut (chosen specifically for its low-friction, self-lubricating properties against the steel screw), two KP08 bearing brackets to support the screw's ends, and a flexible coupling to connect the screw to the stepper motor shaft without requiring perfect shaft alignment. That coupling flexibility matters because achieving perfect concentricity between a motor shaft and a lead screw on a DIY-built frame is genuinely difficult.

Common uses are 3D printer Z-axis motion systems, CNC machine axis drives needing precise linear positioning, and any stepper-motor-driven mechanism needing accurate, repeatable linear travel.