براغي HOLO-KROME 72170 3/8-16 × 2-1/2" ذات رأس مقبس | محرك سداسي | فولاذ سبائكي مع أكسيد أسود حراري (50 / عبوة)

Threads were clean, no burs or gunk in the hex drive, and they seated perfectly in my jig fixture. The black oxide finish looks sharp and should handle shop oil fine. These are exactly what I expect for precision assembly work.

I needed a fastener that could hold up in my milling fixture, and these alloy steel screws are exactly what I was looking for. The hex socket drive made installation really smooth without stripping.

The black oxide finish gives these screws a nice, uniform look, and the hex socket drive grips the allen key securely without any slipping. I used them to hold a fixture plate together and the threads seated cleanly into the tapped holes, so they’re doing the job perfectly so far.