براغي ذات رأس أسطواني 1-3/8-6 × 11 بوصة | محرك سداسي | خيط جزئي | فولاذ سبائكي أكسيد أسود حراري

Installing these into a jig fixture for repeat drilling; the hex socket drive makes seating them deep into counterbores effortless. The partially threaded shank provides just enough grip without fighting through the full length. No stripped heads, no fuss.

I needed a bolt that could handle heavy jig loads without stripping, and these threaded up smoothly even in tight spots. The black oxide finish feels durable and resists oil well so far.

The black oxide finish on these screws is holding up well so far in my jig setup, and the hex socket drive made installation straightforward. Only minor gripe is the partial threading could be a bit longer for certain applications, but overall they're solid for the price.