HOLO-KROME 60014 براغي رأس مقبس #5-40 × 3/8 بوصة | رأس مسطح مع محرك مقبس سداسي | فولاذ سبائكي مؤكسد أسود حراريًا (100 / عبوة)

These fit perfectly into the jig I’m building, and the flat heads sit flush without any wobble. The hex socket drive makes tightening them much easier than a standard slotted screw.

The black oxide finish on these #5-40 screws really holds up well; I've been using them in a jig that gets constant adjustment, no stripping or rust yet. For precision work like this, the flat head fit perfectly into my counterbores without any wobble. Solid little fasteners for the price.

Countersunk perfectly flush with my aluminum jig plate, and the hex drive gripped tight without stripping. I’ve used a dozen from this pack already and the black oxide coating hasn’t chipped or flaked at all.