براغي ذات رأس أسطواني 5/16-18 × 1-1/4 بوصة | محرك سداسي برأس منخفض | سبيكة فولاذ بأكسيد أسود حراري (100/عبوة)

The hex socket drive made it really easy to tighten these down in a tight spot on my tooling setup, and the black oxide finish looks clean. Fit perfectly for a quick fixture repair I had to do.

I needed some for a jig I was building, and the black oxide finish on these feels like it'll hold up better than plain steel in my shop. They threaded smoothly into a tapped hole without any binding.

The black oxide finish on these screws gives them a clean, uniform look straight out of the package, and the low head profile clears tight clearances on my jig without grinding. Only gripe is the hex socket seemed a touch shallow on a few pieces, but they drive fine with a standard allen key.