براغي مقبس نقطة كأس مسننة 1/2-13 × 2-1/2 بوصة | سبيكة فولاذ (50/عبوة)

The knurling on the cup point gives these set screws a solid grip that I haven't seen with smooth ones. I used them to secure a heavy pulley on a shaft, and they've held tight through vibration. The alloy steel feels sturdy, and the hex socket fit my Allen wrench perfectly.

The knurled grip on these screws makes them easy to handle even with greasy fingers, and the hex socket lets me really crank them down tight for a secure hold. Perfect for my jig fixtures.

I needed a long set screw for a heavy-duty alignment jig, and the 2 1/2-inch length with the hex socket made tightening in a cramped spot a breeze. The knurled cup point bit into the shaft without slipping, so I’m confident it’ll stay put under vibration.