براغي رأس أسطوانية 1/2-13 × 3-1/4" | محرك سداسي | رقعة نايلون | خيط جزئي | سبيكة فولاذ بطبقة أكسيد سوداء حرارية (25 / عبوة)

The black oxide finish is exactly what I wanted for my jig builds—it’s got that matte, tough look and the threading is clean and precise. These 1/2-13’s feel solid in the hand, and the hex drive seated perfectly without any stripping.

The hex socket drive made cinching them down with an Allen key effortless, and the nylon patch locks tight without needing thread locker. They fit perfectly into my jig plate, solid feel overall.

The nylon patch on these screws held firm during a jig assembly I was working on, no loosening after vibration tests. The black oxide finish looks clean and professional. Would have preferred fully threaded for my specific application, but they work great for the price.