براغي رأس مقبس 5/16-18 X 3-1/2" | محرك مقبس سداسي | حبيبات نايلون | ملولبة جزئيًا | فولاذ سبيكة أكسيد أسود حراري (100/عبوة)

The nylon pellet in the threads held firm under repeated adjustments on my jig, which is exactly what I needed. These bolts seat cleanly with a hex key and the black oxide finish hasn't shown any wear yet.

Pulled three of these out for a fixture build and the hex socket drive seated perfectly on my Allen key without any wobble. The nylon pellet held tight too, so no vibration loosening on the mill. These are exactly what I needed for the tooling rack.

Threads cut clean and the black oxide finish looks proper on my jig table, these hold up way better than the zinc ones I had before. The nylon pellet locks them in place without needing a drop of threadlocker, which is a nice time-saver on repetitive assembly work.