M42-4.5 x 400mm 소켓 캡 나사 | 육각 소켓 드라이브 | 부분 나사산 | 12.9급 합금강 열처리 블랙옥사이드

Needed some heavy-duty fasteners for a jig I’m building, and these M42 screws are exactly what I was after—the black oxide finish looks durable and the hex socket drive made tightening them a breeze. Charged right through with no stripping, and the size is spot on for my tooling setup.

Pulling a large fixture together with these was surprisingly smooth—the hex socket drive grabbed perfectly with no wobble. The black oxide finish looks sturdy and professional, and the 12.9 grade gives me confidence they’ll handle the torque. Just wish the partial thread was a bit longer for my appl

Installed these in a heavy-duty jig fixture and the 12.9 alloy steel handled the torque without any deformation. The hexagonal socket drive seated perfectly with my driver, no stripping whatsoever.