براغي رأس مقبس #4-40 × 3/8 بوصة | رأس منخفض بمقبس سداسي | فولاذ سبائكي مع أكسيد أسود حراري (100 / عبوة)

The black oxide finish on these screws gives them a really solid, professional look for small tooling projects. I used them on a precision assembly and the hex socket drive bit held perfectly without any stripping, even at low torque. They fit exactly as expected for a #4-40, which is always reassur

These #4-40s are perfect for the jig I'm building, the black oxide finish is a nice touch. They thread smoothly into tapped holes without binding.

The hex socket drive makes these tiny screws super easy to tighten without stripping, and the black oxide coating gives them a nice, uniform look for my jig assembly.