HOLO-KROME 42040 براغي تثبيت ذات رأس مقبس ونقطة كوب محززة 5/16-18 × 5/16" | فولاذ سبائكي معالجة حرارية بأكسيد أسود (100 / عبوة)

The knurled cup point really grabbed tight when I seated them in the tapped hole, no slipping at all. The thermal black oxide finish looks clean and professional on the shaft clamp I was assembling.

These screws worked perfectly for securing a gear on a shaft where I needed a flush, low-profile hold. The thermal black oxide finish looks nice and seems like it will resist rust well.

The knurled cup point on these set screws really bites into the shaft, which is exactly what I needed for a secure hold. Installed a dozen without any stripping issues, and the black oxide finish looks clean. Solid hardware for the price.