HOLO-KROME 33088 براغي مقبس كوب | فولاذ سبائكي مع أكسيد أسود حراري (100 / عبوة)

The black oxide finish on these looks tough and seems resistant to wear, and the cup point design grabbed perfectly in my blind tapped hole without any slop. I used them to hold a pulley on a small shaft, and they haven't budged under load.

These hold like a dream in my shaft collars—the black oxide finish makes them slide right in without binding. I've installed about thirty so far and every

I needed cup point set screws that wouldn't strip when torquing down, and these 1/4-28 x 1-1/4" sockets drove perfectly on the first go. The thermal black oxide finish held up nicely during assembly.