براغي رأس مقبس M36-4 X 70mm | محرك مقبس سداسي | ملولبة بالكامل | فولاذ سبائكي درجة 12.9 مؤكسد أسود حراري (2/عبوة)

The hex socket drive on these made installation with my torque wrench much easier than I expected for such large bolts. The black oxide finish looks quality and hasn't shown any wear after mounting a heavy jig plate. Exactly what I needed for that industrial machinery repair.

Finally got these to replace some tired bolts on a jig I use daily, and the Class 12.9 alloy steel feels like it will outlast the rest of the setup. The black oxide finish handled a bit of oil without any rust so far.

These bolts are definitely heavy-duty; the black oxide finish looks professional and should resist corrosion well. I used them for securing a jig on my mill and the class 12.9 strength gives me serious peace of mind.