براغي رأس كبس M12-1.75 × 60 مم | محرك سداسي | ملولبة جزئيًا | فولاذ سبائك فئة 8.8 أكسيد أسود حراري (50 / عبوة)

The black oxide finish took a couple of knocks during assembly without a single scratch, which is exactly what I needed for a jig that gets constant adjustment. The hex socket drive seated perfectly on my driver, and all fifty threaded in cleanly without any binding.

Tapped these into a tooling fixture and the hex socket drive made seating them a breeze with no cam-out. The black oxide finish looks clean and seems like it'll resist rust well in my shop.

Used a dozen of these in a jig build and the hex socket grabbed the Allen key without any slipping, even at higher torque. The black oxide finish also held up well against minor shop debris during assembly.