HOLO-KROME 32182 براغي ذات رأس مقعرة بمقبس سداسي 3/8-16 X 1-1/4" | سبائك فولاذية مؤكسدة حرارياً باللون الأسود (100 / عبوة)

These black oxide screws blend perfectly into the shaft assembly, and the hex socket drive made installation smooth with no cam-out. Exactly the right fit for securing a heavy clamp in a tapped hole.

I needed to fix a loose cam follower on a milling machine, and the hardened tip bit into the shaft perfectly without slipping. The black oxide coating already saved me from rust worries in my damp workshop.

Used these to secure a pulley on a motor shaft, and the hex socket drive made installation a breeze. The black oxide finish on the alloy steel seems durable so far, though I wish the package had a few extras in case I drop one.