M8-1.25 X 85mm 內六角螺絲 | 圓頭內六角驅動 | 全牙 | Class 12.9 合金鋼 熱處理黑氧化物 (100 顆/包)

Installing these on a jig fixture I’m building, and the black oxide coating really helps them slide into tapped holes without binding. The hex socket drive grips well with my Allen key, and all 100 pieces look consistent out of the bag.

All 100 of these came out of the bag with a uniform black oxide finish, and the threads are perfectly formed with zero burrs on any of them. I used a full batch for a jig build and every single one seated flush without fighting the driver—solid purchase for the price.

The black oxide finish on these is uniform and slick, no flaking after tightening them into a steel jig. Threads cut cleanly into tapped holes without any binding, and the hex socket drive seats the wrench snugly every time.