مسامير رأس مقبس 5/8-18 × 1-1/2 بوصة | محرك مقبس سداسي رأس زر | ملولبة بالكامل | فولاذ سبائك أكسيد أسود حراري (50 / عبوة)

The hex socket drive seated the wrench perfectly with zero wobble, and the thermal black oxide coating looks consistent across all fifty pieces. Threads ran clean into my jig fixture without any binding.

The black oxide finish gives these a nice uniform look and resists fingerprints way better than bare steel. I’ve torqued them into a jig at 110 ft-lbs without any stripping, and the threads cut clean into the tapped holes.

Installed these on a fixture plate for a VMC vice, and the black oxide finish hasn't marred or rusted after a few weeks of coolant spray. The button head sits flush enough for tooling clearance, and the hex socket drove in smoothly without stripping.