M8 X 55mm 杯頭內六角止付螺絲 | 合金鋼 (100 顆/包)

The cup point bites down firmly, so these M8s hold their position even with vibration on the chuck. The hex socket drive made snugging them up in a cramped bracket a breeze. 100 per pack means I’ve got spares for the next dozen jobs.

Installed these on a machine tool slide to lock down a heavy jig, and the cup point bites into the steel firmly without slipping. The 55mm length is just right for going through a tapped blind hole without bottoming out.

Finally, a hex socket drive that actually lets me torque these down in a tight spot without stripping. The cup point tip seats perfectly in the countersink, and the alloy steel feels tough enough for repeated adjustments.