HOLO-KROME 72172 3/8-16 × 2-3/4 بوصة براغي ذات رأس مقبس | محرك مقبس سداسي | فولاذ سبائكي بأكسيد أسود حراري (50 / عبوة)

Installed these on a few heavy-duty tooling fixtures and the black oxide finish holds up well against daily shop grime. The hex drive seated each screw cleanly without any stripping, which was my main worry with 50 pack bulk buys.

Replacing some worn bolts on a drill press table, these black oxide screws seated perfectly with a hex key. The threads cut clean without any binding, and the 50-count pack means I have spares for future projects.

Installed these on a milling jig and the threads engaged perfectly without any binding. The 50-count box will last me through several projects, and the hex socket drive makes tightening in tight spots much easier than a standard bolt.