HOLO-KROME 73142 1/2-20 X 2-1/2" براغي رأس أسطوانية | محرك مقبس سداسي | فولاذ سبائكي بأكسيد أسود حراري (25 / عبوة)

The black oxide coating on these screws handled the coolant in my milling machine without any rust. They seated perfectly in the jig I built, and the hex socket drive made tightening them in tight spaces a breeze.

Installed these in a custom fixture and the black oxide finish looks clean while resisting chips. The hex socket drive gripped firmly with no cam-out during installation.

Installed these on a tooling fixture at work, and the black oxide finish held up perfectly against minor oil splashes without any corrosion. The hex socket drive made tightening them in tight spots really easy.