HOLO-KROME 73130 براغي ذات رأس مقبس 1/2-20 × 1 بوصة | محرك سداسي | فولاذ سبائكي مع أكسيد أسود حراري (50 / عبوة)

The black oxide finish makes these screws look clean and professional in my tooling jig. They threaded smoothly with no binding, and the hex socket drive seated perfectly with my wrench.

Used these to rebuild a fixture at work and the black oxide finish handled the grime without any surface rust after a week of coolant exposure. The hex socket drive seated cleanly with no rounding on the drive, which is what I was worried about with cheaper screws.

Alloy steel is definitely the right call for my jig setups—these haven't stripped or rounded out even after constant tightening with the hex wrench. The black oxide gives them a nice, uniform grip that doesn't flake off when I'm swapping parts on the mill.