M14-2 x 80mm 소켓 캡 나사 | 납작머리 육각 드라이브 | 부분 나사산 | 클래스 10.9 합금강 열처리 흑색 산화피막 (25 / 팩)

The black oxide finish on these screws is more uniform than what I've gotten from other suppliers, and the hex socket drive seated perfectly with my Allen key. Threads on all 25 pieces were clean and consistent, no binding when I torqued them into my tooling fixture.

Installed these in a jig for a production run and the partial threading made alignment much easier than dealing with fully threaded bolts. No stripping or deformation under torque so far, which is exactly what I needed for 10.9 grade steel.

The black oxide finish on these screws handled my jig setup without any wear, and the hex socket drive gripped perfectly with my Allen key. They threaded smoothly into pre-tapped holes and held tight under moderate torque.