براغي رأس أسطواني 1/2-13 × 1" | محرك سداسي | رقعة نايلون | ملولبة بالكامل | فولاذ سبائكي مؤكسد أسود حراريًا (50 / عبوة)

The thermal black oxide finish looks sharp and held up fine during assembly on a couple of jigs I’m building. The hex socket drive seated cleanly with my allen key, and the nylon patch kept them snug without any extra threadlocker.

Used a handful of these to rebuild a jig in my shop, and the black oxide finish looks great and resisted rust from the coolant spray. The nylon patch holds them tight without needing a separate lock washer, which saved me time during assembly.

Used them to rebuild a fixture at the shop and the nylon patch held tight under vibration, which was the main reason I picked these. Threads cut clean into the tapped holes without any binding, though a couple of the black oxide spots looked a bit uneven up close. Still, for the price per piece, the