M30-3.5 X 200mm 소켓 캡 나사 | 육각 소켓 드라이브 | 부분 나사산 | 클래스 12.9 합금강 열처리 블랙 옥사이드 (5개/팩)

The partial threading on these M30 screws made aligning them in my jig much easier than fully threaded bolts. They seated firmly with a standard hex key, and the black oxide looks professional.

The black oxide finish on these screws is holding up well in my tooling setup without any signs of rust so far. The hex socket drive gives a solid, no-slip grip when tightening them down with an Allen key.

I needed a high-strength bolt for a heavy-duty jig, and these 12.9 alloy steel screws handled the load perfectly. The partially threaded design made alignment much easier than fully threaded ones I've used before.