HOLO-KROME 32040 #5-40 X 5/16" براغي مقبس نقطة كوب من الصلب السبائكي مع أكسيد أسود حراري (100 / عبوة)

The hex socket drive seated perfectly on my Allen key, and the thermal black oxide finish gives them a nice grip without any galling. I’ve used about half the package on a shaft-collar job and every single one threaded clean with no chips.

Threaded them into a small pulley assembly on a motor shaft and the cup point locked down nicely without any slipping. The black oxide finish felt smooth and uniform across all 100 pieces, which made them easy to handle with a hex driver.

The cup point bites into the shaft firmly once torqued down, and the thermal black oxide finish has held up through a few disassembly cycles without any galling on the threads. Exactly the 100 count I needed for batch work, and the hex socket drive stays clean even when I’m over-tightening.