HOLO-KROME 72280 براغي رأس مقبس 5/8-11 X 3 بوصة | محرك مقبس سداسي | فولاد سبائكي مع أكسيد أسود حراري (25 / عبوة)

The black oxide finish on these is perfect for my jigs—no glare and they thread in smooth without binding. I’ve torqued them down hard on a fixture and they’ve held up all week.

Used a handful of these to repair an old milling machine's clamp set, and the black oxide finish looks factory-fresh. The hex broaching is clean and deep, so my Allen wrench grabbed tight with no rounding. Exactly what you need for heavy tooling work.

Installed these on a hydraulic press jig and they torqued down perfectly without any galling. The black oxide finish held up well to the hydraulic fluid residue.