براغي رأس سداسية مجوفة بنقطة كوب 5/16-18 × 1-3/8" | فولاذ سبائكي (100/عبوة)

The cup point really bites into the shaft, so these set screws don't back out under vibration. Alloy steel feels sturdy, and the hex drive gave me a solid grip in tight spots. Exactly what I needed for a stubborn pulley repair.

The hex socket drive made tightening these into a tight machine frame a breeze; the cup point really bites down securely. Worked perfectly for locking down a collar on a rotating shaft.

Finally got around to installing these on a workholding fixture, and the cup point really digs in without marring the shaft. The hex socket let me torque them down easily in a cramped spot.