براغي مقبس أسطواني 7/16-14 × 1-1/2 بوصة | محرك مقبس سداسي | صناعة أمريكية | فولاذ سبائكي مع أكسيد أسود حراري (650 / عبوة)

Used these for a precision assembly fixture at work and they threaded in smoothly without any binding. The black oxide finish looks consistent across every single screw in the box.

I needed high-strength fasteners for a jig I was building, and these alloy steel black oxide screws cut through oil and grime without stripping the hex socket. The 650-count box is a bonus for future projects.

The hex sockets seated perfectly on my Allen wrench with zero stripping, and the black oxide finish gives them a clean, uniform look across all 650 pieces. I used these for a production jig build and didn't have a single bad thread in the batch. Solid US-made hardware for the price.