براغي غطاء مقبس 1/2-13 × 3/4 بوصة | محرك مقبس سداسي | رقعة نايلون | ملولبة بالكامل | فولاذ سبائكي مؤكسد أسود حراريًا (50 / عبوة)

The black oxide finish on these screws held up perfectly during assembly, no galling or stripping. I used them to mount a heavy-duty bracket on a milling machine, and the nylon patch keeps them locked in place even with vibration.

I used a batch of these to secure a jig I was building for my drill press, and the nylon patch held them tight without any loosening during the work. The black oxide finish looks clean and professional, too.

The hex socket drive on these screws fits my driver bit perfectly with zero wobble, and the nylon patch adds just enough grip to keep them from backing out during assembly. They’re exactly the right size for mounting jig hardware on my workbench.