HOLO-KROME 42056 1/2-13 X 3/4" براغي تثبيت ذات نقطة كوب محززة | سبيكة فولاذ أكسيد أسود حراري (50 / عبوة)

The black oxide finish on these set screws is holding up well in a slightly damp machine shop environment. I had to get a set for a replacement part, and the hex socket engagement feels solid and precise. Definitely a step up from the generic ones I tried before.

Installed these on a conveyor shaft last week and the knurled cup point really bit into the metal without slipping. The black oxide finish looks professional and hasn't shown any rust yet despite some moisture exposure.

Used a few of these to secure a sprocket on a custom shaft build, and the knurled cup point grabbed nicely without slipping during tightening. The black oxide finish held up well against some light oil exposure too.