M42-4.5 x 260mm 소켓 캡 나사 | 육각 소켓 드라이브 | 부분 나사 | 강도 12.9 합금강 열처리 블랙 옥사이드

Installing these in a heavy jig assembly was a breeze—the hex socket drive took full torque without any stripping. The 260mm length is perfect for reaching through multiple layers, and the black oxide seems like it’ll hold up well against shop grime.

The black oxide finish is beautifully uniform and the threads cut cleanly into my jig fixture without any binding. These M42s feel rock-solid for the heavy clamping loads I put on them, and the 12.9 hardness shows in how they hold their shape.

I needed large-format cap screws for a custom jig setup I’m building, and these M42–4.5 x 260mm ones with the hex socket drive are exactly the right fit for the adjustable clamping arms. The partially threaded shaft gives me good grip depth without the extra material interfering in tight spots. They