براغي رأس مقبس 1-8 × 4" | محرك مقبس سداسي | صناعة أمريكية | فولاذ سبائك مع أكسيد أسود حراري (10 / عبوة)

Finally found black oxide screws that actually hold up in my jig setup—the hex drive seated perfectly without stripping. They're a solid length for deep fixtures without any wobbly fit.

Absolutely needed a full 4-inch length for a jig I was building, and the black oxide finish on these makes them look and feel like serious industrial components. They threaded cleanly with no binding or galling, exactly what I expect from quality alloy steel.

The hex socket drive grips like a dream, and the thermal black oxide finish is holding up well under heavy clamping pressure in my jig setup.