براغي رأس كبس HOLO-KROME 72156 3/8-16 X 7/8 بوصة | محرك سداسي | فولاذ سبائكي مع أكسيد أسود حراري (100 / عبوة)

Had to swap out some stripped bolts in a jig setup at the shop, and these black oxide screws threaded in smooth without any binding. The 3/8-16 pitch is spot on for that kind of precision work, and the pack of 100 gives me plenty of extras for future projects.

The hex drive seated perfectly into my socket wrench without any wobble, and the black oxide coating looks uniform across all 100 screws. Used them to rebuild a jig fixture and they held up under repeated torquing.

I was worried about stripping out threads on a repair jig, but these cap screws held their torque perfectly even under some heavy wrenching. The black oxide finish feels durable and the hex drive engaged cleanly every time.