براغي رأس مقبس M14-2 X 100mm | محرك سداسي | خيط جزئي | فولاذ سبيكة فئة 12.9 أكسيد أسود حراري (25 / عبوة)

The threads cut cleanly and the black oxide finish held up well during my fixture build. These bolts fit perfectly in my mill table T-slots without any binding.

The black oxide finish on these screws handled the coolant in my milling fixture perfectly, no rust after weeks of constant exposure. The hex socket drive engaged cleanly without any stripping, which is a huge relief compared to cheaper fasteners I've used.

Installed these in a jig I'm building and the partially threaded design made alignment much easier than full-thread bolts would have. The hex socket drove smoothly with no stripping, and the 12.9 grade feels rock solid under torque.