HOLO-KROME 76520 M20-2.5 X 90mm 소켓 캡 나사 | 육각 소켓 드라이브 | 합금강 열처리 블랙 옥사이드 (10개/팩)

Threaded them into a jig fixture this morning and they seated cleanly with no binding—the M20-2.5 pitch is spot on. The thermal black oxide finish feels slick and even, and the socket drive grabbed the Allen key without any wobble.

I’ve used these in a jig fixture for a few weeks now, and the black oxide finish has held up fine under regular handling. The hex socket drive seated perfectly with my torque wrench, no rounding on the edges. Threads are consistently clean, which made assembly quicker than I expected.

The thermal black oxide finish on these M20 screws looks seriously tough and hasn't shown a hint of wear after mounting several heavy jigs. They threaded in cleanly without binding, which was a relief for such a large size. Just the right length for my precision assembly needs.