9/16-18 X 3" 소켓 캡 나사 | 육각 소켓 드라이브 | 풀 스레드 | 합금강 열처리 블랙 옥사이드 (25개/팩)

Used three of these in a jig I'm building and the threading was clean all the way down the shaft. The hex socket drive fit my wrench perfectly without any wobble.

The black oxide finish is way more uniform than what I've gotten from other suppliers, and the hex socket drive seated perfectly on my torque wrench. Threads ran clean through a steel plate without any binding, so these are going straight into my permanent tooling rotation.

Used these on a fixture jig I'm building and the hex socket drive seated perfectly every time, no stripping even at 40 ft-lbs. The 3-inch length and fully threaded shaft gave me solid engagement in thick steel plates. These are my go-to for precision work now.