螺母，Z 軸鎖定，HiTorque 工作台銑床

Replaced the worn lock nut on my SX2.7 and the Z-axis holds position now instead of drifting between passes. Threads matched the feed screw base perfectly, no re-tapping needed.

After my Z-axis started creeping during deep cuts, threading this locking nut onto the bottom of the feed screw fixed it completely. It seats into the base nice and tight and the screw hasn't budged since.

Snugged right into the Z-axis feed screw base on my bench mill and took up the backlash I'd been fighting for months. Threads were clean and it seated without any slop. Wish I'd swapped this out sooner.