براغي رأس مقبس 7/16-20 × 1-1/2 بوصة | محرك مقبس سداسي | صناعة أمريكية | فولاذ سبائكي أكسيد أسود حراري (300 / عبوة)

The black oxide finish is perfectly even and the hex sockets are cut clean, so my 5mm Allen wrench seats tight every time. I’m three weeks into a precision assembly run and haven’t had a single stripped head or coating flake. These are exactly what I expect from US-made alloy steel.

I needed a bulk supply for my jig builds, and the hex sockets grab perfectly without any cam-out. The alloy steel feels substantially harder than the cheap imports I've used before.

The black oxide finish on these screws is really consistent across all 300 pieces, and they threaded smoothly into my jig without any binding.