براغي رأس كبس مقاس M8-1 × 80 مم بمحرك سداسي، ملولبة جزئيًا، فولاذ سبائكي فئة 12.9 مع أكسيد أسود حراري (100/عبوة)

Used these to bolt down a new base plate for my indexing jig, and the threading is noticeably smoother than the random bolts I had lying around. The black oxide finish has held up well against a few spills of cutting fluid without any surface rust. They drive in clean with a hex key and seat flush e

Finally got around to replacing some worn bolts on my milling machine, and the 12.9 hardness on these is definitely a step up from the old hardware. The black oxide coating seems consistent and should hold up well in the oily shop environment.

Installed these on a jig today and the hex socket drive seated perfectly without any stripping. The black oxide finish looks clean and the 80mm length gave me exactly the thread engagement I needed.