براغي رأس مقبس 2-4-1/2 × 15" | محرك مقبس سداسي | خيط جزئي | فولاذ سبائكي مؤكسد أسود حراريًا

I was a little worried the partially threaded design wouldn’t hold as well in my jig, but it tightened perfectly and the black oxide finish has already resisted a few knocks.

Installed these in a heavy-duty jig I’m building, and the hex socket drive made torquing them down easy. The partially threaded design gave me just the right clamping force without binding.

The thermal black oxide finish gave these a clean, uniform look straight out of the box, and the partially threaded design gripped perfectly in my jig setup. Honestly, for 15-inch alloy steel screws, they felt sturdier than I expected during tightening.