براغي ضبط مقبس بنقطة كبس مخددة HOLO-KROME 42042 5/16-18 × 3/8" | فولاد سبائكي مؤكسد أسود حراري (100/عبوة)

The hex socket drive made seating these into the tapped holes surprisingly effortless, even with the cup point biting in. The thermal black oxide finish holds up well during assembly without any flaking. Exactly the clamping grip I needed for a shaft fixture.

The knurled cup point really grips the socket without slipping during assembly, and the black oxide finish hasn't shown any wear after a few installs. Exactly the consistency I've come to expect from this style of screw.

These set screws hold better than the standard ones I used before, the black oxide finish also seems to resist rust well so far. The knurled cup point gave me a secure bite on the shaft without any slipping during assembly.