鎖緊環，主軸螺帽

It’s a simple part, but the machining is clean and the threads engaged perfectly on my spindle, so no more wobble. This lock ring did exactly what it was supposed to, and at this price I’m not complaining.

The threaded fit was spot-on for my mini lathe, and the steel feels sturdy enough to handle the torque without stripping. It locked down tight on the first try, no wobble at all.

This was a straight swap for the one I lost on my mini lathe, and the fit is spot-on with zero wobble. Threaded on smoothly and locked down tight, exactly what I needed for the spindle.