براغي ذات رأس أسطواني 9/16-18 × 1-1/4 بوصة | محرك سداسي | ملولبة بالكامل | فولاذ سبائكي مع أكسيد أسود حراري (50 / عبوة)

I was pleasantly surprised how precise these screws fit into my jig setup—the black oxide finish really resists the grime from cutting fluids. For 50 pieces at this quality level, it's a solid deal for any machine work.

Pulled these out for a machinery adjustment last night and the hex socket drive gripped perfectly without any stripping. The black oxide finish looks clean and feels sturdy against the steel.

Installing these in a jig for a production run and every single screw seated perfectly without any burs or defects on the threads. The hex drive took a lot of torque without rounding out, which was my biggest worry with cheaper bolts.