مسامير رأس أسطواني بمقبس سداسي منخفض 5/8-11 X 2-1/4" | محرك مقبس سداسي | فولاذ سبائكي مؤكسد أسود حراريًا (25/عبوة)

The black oxide finish wiped clean easily and the hex drive grabbed without any slipping, which I appreciate when torquing them down on my fixture plates. These are holding up well on a heavy-duty jig I've been running all week, so the alloy steel feels like the right choice.

Fit was spot on for my jig setup, and the hex socket drive grabbed cleanly without any stripping. The thermal black oxide coating feels tough and consistent, exactly what I need for repeated clamping in a machine fixture.

Had to swap out some stripped bolts on a milling jig, and these alloy steel screws threaded in smooth with no binding. The black oxide finish looks clean and should resist rust way better than the plain steel ones I was using before.