HOLO-KROME 33112 براغي ضبط سداسية مقعرة 3/8-24 × 3/4 بوصة | سبيكة فولاذ مؤكسد أسود حراري (100 / عبوة)

The black oxide finish on these screws provides good corrosion resistance, and the hex socket drive made installation straightforward with a standard Allen key. They held firmly when I used them to secure a pulley on a motor shaft.

Finally found exactly what I needed for mounting a timing pulley on a shaft; the 3/8-24 thread matched perfectly and the hex socket drive made installation easy with just an Allen key.

The cup point does a decent job gripping the shaft, but I noticed the hex socket feels a bit shallow on a couple of screws from this pack. Work fine for light clamping, but I wouldn't trust them for anything heavy-duty.