1/2-20 × 3" براغي رأس مقبس | محرك مقبس سداسي | حبة نايلون | ملولبة جزئيًا | سبيكة فولاذ أكسيد أسود حراري (50 / عبوة)

The black oxide finish on these is surprisingly even and durable, and the nylon pellet in the threads held my fixture snug even after a few tighten/loosen cycles. For a 50-pack of this size and grade, the price felt fair. I've got plenty left over for the next tooling project.

Had to swap out some worn fasteners on a jig at work, and these threaded in smooth as butter with the hex socket drive. The thermal black oxide finish looks sharp and feels durable, and the partial threading gave my assembly just the right grip. These are going to be my go-to for tooling from now on

The nylon pellet in the threads is a nice touch for keeping them locked in place on my jig setup, and the partial threading grabbed just right. Fifty of them in the pack means I won’t be running out any time soon.