HOLO-KROME 72248 براغي رأس مقبس 1/2-13 × 4 بوصة | محرك سداسي | فولاذ سبائكي أكسيد أسود حراري (25/عبوة)

The black oxide finish on these screws held up perfectly during a heavy-duty machining setup I’ve been running. They threaded smoothly into a steel jig and didn’t strip or bind. Exactly the quality I was hoping for.

I needed longer bolts for a jig I was building, and these 4-inch screws fit perfectly. The hex socket drove smoothly without any cam-out, and the black oxide finish looks clean.

The black oxide coating is holding up well in my workshop, even after a few days of use in a jig setup. Threads cut clean and the hex socket drove easily with no stripping. Exactly what I needed for a heavy-duty fixture.