براغي سوكيت سيت بنقطة كيرلد H-K 42046 5/16-18 × 1 بوصة | فولاذ سبائكي مؤكسد أسود حرارياً (100/عبوة)

The knurled cup point really digs into the shaft—no slipping at all after I torqued them down for a gear clamp. I've used cheaper set screws before, but the black oxide finish on these actually holds up without rusting in a damp shop.

Was swapping out some worn shaft collars on a conveyor line and these set screws threaded in smoothly with no binding. The black oxide finish held up well against the slight moisture in the shop air.

The knurled cup point really bites into the shaft, and these hold better than any set screw I've used before. Perfect for a recent fixture build where I needed a secure lock without marring the surface. Exactly the right size for a 5/16-18 tapped hole.