HOLO-KROME 73118 3/8-24 X 2-1/2" 소켓 캡 나사 | 육각 소켓 드라이브 | 합금강 열처리 블랙 옥사이드 (50 / 팩)

Used these for a jig I was assembling and the black oxide finish held up perfectly against the metal shavings. The 3/8-24 threads chased cleanly into my fixture plate with no binding at all. Exactly what I needed for tooling work.

Just finished a fixture build that needed fifty of these, and the black oxide finish didn’t chip or flake during torquing—they seated perfectly in tapped holes. The alloy steel feels solid, and the hex drive gripped without stripping, which is all I ask for in tooling fasteners.

The threads cut clean and the hex socket sits perfect, no wobble when seating them into my fixture jig. Set of 50 is plenty for the job, and the thermal black oxide looks sharp against the steel baseplate.