HOLO-KROME 87198 M12-1.75 X 70mm 소켓 캡 나사 | 플랫 헤드 육각 소켓 드라이브 | 합금강 열처리 블랙 옥사이드 (50 / 팩)

I was surprised how perfectly these M12 bolts fit into my jig setup—the hex socket drive really made installation effortless. The threads cut cleanly into the alloy steel without binding, and the 70mm length was just right for my precision assembly.

Needed a full box of M12s for a new jig setup, and the 70mm length seated perfectly without any reaming. The thermal black oxide gave them a consistent, slick finish that made threading into the fixture a breeze, and all fifty came out of the box with clean threads.

The black oxide finish seems to hold up better than the plain steel bolts I've used on my tooling fixtures. They threaded smoothly into tapped holes without binding, and the hex socket drive gave a solid grip without stripping. Just wish the package included a few extras for the inevitable dropped o