HOLO-KROME 33090 5/16-24 X 1/4" Cup Point Socket Set Screws | سبيكة فولاذية مؤكسدة حرارياً سوداء (100 / عبوة)

The black oxide finish on these set screws holds up well in oily environments without rusting. The cup point grips the shaft tightly and doesn't slip under vibration. Exactly what I needed for securing a pulley on a motor shaft.

The hex socket drive fit my Allen wrench perfectly, and the black oxide finish makes them easy to spot against the steel shaft. Used a dozen to lock a pulley in place, and the cup point held firm after a full day of vibration.

The hex socket drive makes tightening these set screws in tight spaces much easier than using a standard screwdriver. The black oxide finish looks clean and professional on my latest assembly project.