1/2-12 × 5" براغي ذات رأس مقبس | محرك مقبس سداسي | ملولبة جزئيًا | فولاذ سبائكي مع أكسيد أسود حراري (25/عبوة)

The black oxide finish on these screws held up perfectly during my tooling setup—no galling or rust after a full day of clamping. They threaded smoothly into tapped holes without binding. Exactly the grip and strength I needed for a precision assembly.

I used these on a heavy jig fixture at work, and the hex socket drive made installation much easier than standard bolts. The black oxide finish also held up well against minor moisture during the build.

The partially threaded shaft made driving these into my metal fixture a lot quicker than fully threaded bolts. The black oxide coating has a nice, non-glare finish and seems to resist minor scratching.