براغي هولو-كروم 32232 1/2-13 × 2-1/2 بوصة من نوع كوب بوينت | فولاد سبائك أسود حراري (25/عبوة)

The cup point bites into the shaft exactly where I need it, and the 2-1/2" length gives plenty of thread engagement for a solid clamp. These set screws are the right pick when you need a secure hold without a protruding head.

The hex socket drive made installation into my shaft assembly straightforward, and the black oxide finish hasn't shown any wear after a few weeks.

These set screws held my pulley firmly in place with no stripping thanks to the cup point biting into the shaft. The thermal black oxide finish looks solid and should resist rust well in my shop. Exactly what I needed for a simple clamping job.