براغي رأس أسطواني مقاس 1/2-13 × 2-3/4 بوصة | محرك سداسي | رقعة نايلون | ملولبة جزئيًا | فولاذ سبائكي مؤكسد أسود حراري (50 / عبوة)

I needed these for a jig I’m building, and the hex socket drive made installation really simple with just an Allen key. The nylon patch is a nice bonus—it holds the screw in place without any extra thread locker.

The thermal black oxide finish on these is gorgeous—deep, even, and already looking great in the jig I built. The hex socket drive engaged cleanly with no stripping, and the partially threaded section seated perfectly in my fixture plate.

The nylon patch on these screws held fast during assembly of a new fixture, and I didn't have to add any thread locker. The black oxide finish looks consistent across all 50 pieces, and the hex socket drove cleanly without stripping.