HOLO-KROME 32142 5/16-18 X 3/8" براغي تثبيت ذات رأس سداسي بنقطة كوب | سبيكة فولاذ أكسيد أسود حراري (100 / عبوة)

The black oxide finish really holds up well on these cup point screws—no rust after a few months in a damp shop. They bottom out cleanly in tapped holes, which saved me time on a recent shaft assembly.

I needed a few of these to lock a pulley onto a motor shaft, and the cup point bit into the shaft firmly without stripping. The black oxide finish feels durable and should resist rust well in my shop.

The hex socket drive made installation straightforward with a standard Allen key, and the black oxide finish looks uniform across all 100 pieces. I used these for securing a pulley assembly, and the cup point held firm without stripping.