M4-0.7 X 25mm 소켓 캡 나사 | 로우 헤드 육각 소켓 드라이브 | 부분 스레드 | 클래스 10.9 합금강 열처리 블랙 옥사이드 (400 / 패키지)

The low head profile makes a real difference in tight clearance setups where regular cap screws won't fit. These hex drivers engage cleanly, and the black oxide finish adds a nice touch of corrosion resistance. Good value for a full pack of 400 pieces.

Finally a batch of M4 low head screws that actually hold up under repeated clamping; the black oxide finish has survived several assembly cycles without any visible wear. They're a perfect fit for tight clearance spots in my tooling fixtures where a standard cap head would snag.

Used these for a jig fixture at work and the black oxide finish handled cutting fluid without a hint of rust. The low head design saved me from having to counterbore, which was a nice bonus.