براغي ذات رأس مقبس 1/2-12 × 2-1/2 بوصة | محرك مقبس سداسي | خيط جزئي | فولاذ سبائكي مع أكسيد أسود حراري (50 / عبوة)

Was a little worried about the thread fit on these, but the 1/2-12 threads cut smoothly into my steel fixture plate without any binding. The black oxide finish seems durable and hasn't chipped during tightening.

Installing these on a jig I built was a breeze; the partially threaded design grabbed perfectly without needing extra washers. The black oxide finish on the alloy steel feels tough and professional. Exactly what I needed for precision work.

The partially threaded shank made alignment easier when I was mounting a heavy jig to my drill press table. These cap screws held up well during the first week of machining work, and the hex socket drive didn't strip out even with some torque. Only minor gripe is the packaging could use a resealable