HOLO-KROME 72270 براغي غطاء مقبس 5/8-11 × 1-3/4 بوصة | محرك سداسي مقبس | فولاذ سبائكي أكسيد أسود حراري (25 / عبوة)

Installed these on a fixture that gets constant vibration and the black oxide finish hasn't worn at all. The 5/8-11 thread fit perfectly into my tapped holes on the first try.

I’ve used a lot of socket cap screws in tooling, and these ones have that consistent thread fit and smooth hex socket that makes assembly feel rock solid. The thermal black oxide coating has a nice even look and seems to resist rust during storage. For precision jigs and fixtures, they’re exactly wh

These hex socket screws fit perfectly into my drill press jig, and the black oxide finish seems to hold up better than standard zinc against minor rust. The 5/8-11 threads bit cleanly into my tapped holes with no binding, which was a relief for a precision assembly.