براغي ذات رأس مقبس #3-56 × 1/2 بوصة | رأس مسطح مع محرك سداسي | ملولبة بالكامل | فولاذ سبائكي مع أكسيد أسود حراري (200 / عبوة)

Finally found a vendor that stocks these tiny flat heads in alloy steel with the black oxide finish, and they fit perfectly in my jig's counterbores. The hex socket drive engaged cleanly without stripping even on the first use.

I’ve been using these 3-56 x 1/2" socket cap screws for a fixture build, and the black oxide finish seems durable. The hex drive seated cleanly in my driver without stripping—nice for such small fasteners.

My jig assembly has never been this clean—the thermal black oxide finish holds up well against shop grime and the hex drive bites perfectly without stripping. Rebuilding my fixture table took half the time since every one of the 200 screws threaded smoothly.