براغي رأس كبس مقبس 1/2-13 X 6-1/2" | محرك مقبس سداسي | رقعة نايلون | خيط جزئي | فولاذ سبائكي أكسيد أسود حراري (10 / عبوة)

The black oxide finish handled my oily shop environment without a speck of rust, and the hex socket drive seated perfectly in my torque wrench. Threaded section gave me just the right grip for the jig I was building, and the plastic patch held firm during a full day of vibration.

The nylon patch on these screws is a nice touch—holds them in place during assembly without needing extra thread locker. Used them for a jig build and all ten seated perfectly.

Installed these on a heavy-duty press fixture and the nylon patch held tight even under vibration. The black oxide finish wiped clean easily and hasn’t shown any wear after a few weeks of use.