براغي هولوكروم 32230 1/2-13 × 2 بوصة كأس نقطة مقبس | فولاذ سبيكة أكسيد أسود حراري (25 / عبوة)

The black oxide finish on these set screws gives them a nice grip, and the hex socket drove in smoothly without any wobble. Exactly what I needed for securing a pulley onto a shaft.

These hold tight without stripping, even when I’m cinching down on a hard steel shaft. The black oxide finish looks durable and hasn’t shown any rust after a few uses.

The hex socket drive grabbed the shaft firmly on the first try, and the black oxide finish wiped clean without any mess. I’ve used cheaper set screws that stripped easily, but these cup points held their bite through a full torque cycle without a hint of galling. For the price per piece, the added d