براغي رأس سداسية داخلية M4-0.7 X 75mm | محرك سداسي داخلي | خيط جزئي | فولاذ سبائكي درجة 12.9 أكسيد أسود حراري (100 / عبوة)

I needed longer M4 screws for a jig I’m building, and these 75mm ones with the hex socket drive made installation so much easier. The threads are clean and the black oxide finish looks nicely uniform across all 100 pieces.

Perfect length for my jig build—the 12.9 alloy steel feels rock solid, and the hex drive seated cleanly even in tight spots. Had to swap out a batch of weaker bolts, and these threaded in smoothly without any binding.

Installed these on a custom press fixture and the 12.9 alloy steel held torque perfectly without any stripping. The black oxide finish also resists the light oil we use.