HOLO-KROME 33128 براغي ضبط مقبس نقطة كوب 1/2-20 × 3/4 بوصة | فولاذ سبائكي أسود حراري (100 / عبوة)

I needed some for a quick repair on a conveyor drive shaft and these are holding up perfectly. The black oxide finish feels durable, and the cup point really bites into the shaft.

Grabbed a pack of these for a shaft collar project and the heat-treated alloy steel is noticeably harder than the cheap hardware store ones I’ve tried before. The hex socket drive fits snug with no stripping, and the cup point bites into the keyway exactly where I wanted. Sure, they’re a bit pricey,

The cup point on these set screws really bites into the shaft without slipping, and the thermal black oxide finish adds a nice layer of protection against rust. I needed a full pack for a large repair job, and having 100 pieces in one box was a great value.