براغي مقبس كوب 1/2-20 × 1-3/8 بوصة | فولاذ سبائك (25 / عبوة)

These set screws fit perfectly into the adjustment hub on my milling machine, and the cup point bit into the shaft exactly as needed. The hex drive made it easy to apply plenty of torque without stripping the socket.

I needed a set of cup point screws for a stubborn shaft collar, and these alloy steel ones definitely hold tight without stripping. The hex drive makes it easy to get them snug even in a cramped spot.

The hex socket drive grabbed my Allen key perfectly even with my fat fingers wedged against the motor mount, and the cup point bit into the shaft without walking. These alloy steel screws held up through a full weekend of vibration without loosening a hair.