مسامير ذات رأس أسطواني 5/16-24 X 2-1/4" | محرك سداسي | حبيبات نايلون | خيط جزئي | فولاذ سبائكي مؤكسد أسود حراريًا (100 / علبة)

I needed some strong fasteners for a jig I was building, and these hold up perfectly without any stripping. The black oxide finish also gives them a nice, uniform look in the assembly.

The nylon pellet in these keeps them locked in place better than plain threads, which is exactly what I needed for a fixture that sees constant vibration. The black oxide finish looks clean and hasn't shown any wear after a week of assembly and disassembly.

Finally got these installed in a jig I've been building; the hex socket drive made tightening them in tight spots a breeze. The black oxide finish looks great and seems like it'll hold up well in our shop environment.