براغي مقبس 7/8-9 × 4 بوصة | محرك مقبس سداسي | صناعة أمريكية | سبيكة فولاذ معالجة حرارياً بأكسيد أسود (10 / عبوة)

The black oxide finish looks sharp on these, and the hex socket drive seated perfectly with my Allen wrench. Threads were clean all the way down, no burrs or hesitation when I torqued them into a jig plate. Solid 7/8-9 size for heavier fixture work.

Put together a few tooling fixtures and these screws held exactly as expected. The black oxide finish slides into tapped holes smoothly and keeps them looking clean even after repeated adjustments.

I’ve been using these in a jig fixture for weeks, and the black oxide finish still looks fresh with no rust. The hex socket drive made installation quick with a standard Allen wrench, and they held torque without stripping.