M18-2.5 X 110mm 소켓 캡 나사 | 육각 소켓 드라이브 | 부분 나사산 | 12.9급 합금강 열처리 블랙 옥사이드 (10 / 팩)

Installed these on a heavy-duty jig fixture I'm building, and the partial threading made alignment with the clamping load much easier than a fully threaded bolt. The black oxide finish seems like it'll hold up well against the shop grime.

I was worried about getting the right length for my jig setup, but these M18-2.5 x 110mm screws threaded perfectly into the tapped holes. The class 12.9 alloy steel feels really solid for heavy clamping.

The thermal black oxide finish looks properly done, no uneven patches or tooling marks right out of the pack. Threads are clean and the partial thread length is exactly what I needed for a jig build, though the hex socket is a touch snug on a standard key until it seats.