براغي رأس أسطوانية 9/16-18 × 2-1/2 بوصة | محرك سداسي | ملولبة بالكامل | فولاذ سبائكي بأكسيد حراري أسود (25/عبوة)

I needed a set of strong bolts for a press fixture and the black oxide finish on these seems much more durable than plain steel ones I've used before. The threads were clean and started easily by hand without any binding.

The hex socket drive grabbed cleanly on all 25 pieces, and the threads ran smooth without any binding during assembly. The black oxide finish looks properly done, and these are holding up well in my jig setup.

The black oxide finish on these socket cap screws looks really clean on my jig, and they threaded in smoothly without any binding. I appreciate that the hex drive let me get them snug without stripping. A solid upgrade from my old hardware.