HOLO-KROME 32152 5/16-18 × 7/8 بوصة براغي تثبيت بمقبس سداسي بنقطة كوب | سبيكة فولاذية بأكسيد أسود حراري (100 / عبوة)

The black oxide finish on these set screws is holding up nicely against rust in my machine tool fixture, and the cup point digs in firmly without slipping on the shaft. I used a 5/16-18 tap to clean the threads first, and they threaded in smooth with no binding. Just what I needed for a reliable cla

Installed these in a steel collar to hold a pulley in place, and the cup point really bit into the shaft without stripping. The hex drive seated perfectly, and the black oxide finish looks clean.

These cup point screws bit into the shaft perfectly without slipping during assembly. The hex socket drive made installation straightforward even in a tight spot.