براغي رأس مقبس #9/16-12 × 9" محرك مقبس سداسي ملولبة بالكامل فولاذ سبائكي أكسيد أسود حراري (100 / عبوة)

All 100 of them arrived perfectly threaded and the thermal black oxide coating gave them a nice, consistent finish. They fit my hex driver snugly without any wobble, and at 9 inches long, they’ve held up great in my tooling setup so far.

I needed some long cap screws for a jig I was building, and these 9-inchers fit perfectly with clean, consistent threads all the way down. The black oxide finish took a little torque without any galling, which saved me from having to chase the holes.

The threads cut clean and the black oxide finish has held up nicely against shop oil and grime. I used a dozen of these in a jig build and every one seated flush without a single stripped socket.