براغي رأس مقبس 3/4-10 × 1-3/4 بوصة | محرك مقبس سداسي | صناعة أمريكية | سبائك فولاذية مؤكسدة حرارياً باللون الأسود (25/عبوة)

Installed these in a jig for a production run and the hex drive seated perfectly without stripping. They feel solid and the black oxide finish holds up well to handling.

Had a batch of these show up for a fixture rebuild, and the hex drive seated perfectly without any stripping. The alloy steel feels solid, and the black oxide finish was consistent across all 25 pieces.

The black oxide finish wiped clean easily and left no residue on my fingers, which is a nice change from cheaper screws. Threads cut smoothly into mild steel with a tap, no binding at all. Only gripe is the packaging—the box arrived slightly crushed, but the screws themselves were perfectly fine.