براغي رأس أسطواني HOLO-KROME 60090 5/16-18 X 2-1/4 بوصة | رأس مسطح محرك سداسي | فولاذ سبائكي أكسيد حراري أسود (100 / عبوة)

The black oxide finish on these screws looks great and seems to hold up well against minor scuffs during assembly. The hex socket drive seated perfectly with my Allen key, and all 100 pieces had clean, consistent threads out of the box. Exactly what I needed for machining fixtures.

The black oxide finish on these screws held up perfectly during assembly, no stripping or galling even with a hex driver. Exactly the length I needed for a jig fixture, and the flat head sits flush without any filing needed.

The flat head sits perfectly flush in my jig, and the black oxide finish looks like it'll resist rust well. These 5/16-18 screws thread smoothly and feel solid for tooling work.