HOLO-KROME 730002080 7/16-20 X 3" 소켓 캡 나사 | 육각 소켓 드라이브 | 합금강 열처리 블랙 옥사이드 (25 / 팩)

The black oxide finish on these screws held up perfectly when I tightened them into a steel fixture, no galling at all. Threads felt buttery smooth going in, which I've come to expect from alloy steel hardware.

Used these for a heavy-duty jig I’m building and they seated cleanly every time. The thermal black oxide looks evenly done, and the threads cut smoothly without any binding. For 25 pieces at this price, they’re a solid pick.

The black oxide finish on these screws is a nice touch—they slid into my jig setup without any galling, and the hex socket gripped firmly on the first try. 7/16-20 threading matched up perfectly with my tooling plate. Solid pack of 25, no complaints.