براغي رأس كبس بمقبس #4-40 × 1/4 بوصة | محرك سداسي منخفض الرأس | فولاذ سبائكي مع أكسيد أسود حراري (100/عبوة)

I needed a low-profile fastener for a tight jig assembly, and these little screws worked flawlessly. The black oxide coating gives them a nice, uniform finish that blends in well.

These little screws fit perfectly in my jig's counterbored holes, and the black oxide finish looks clean and professional. The hex socket drive held up well to repeated torquing without stripping. Exactly what I needed for a cramped assembly.

I needed a batch for a tooling fixture and these #4-40s fit perfectly without any binding in the threads. The black oxide finish holds up well to handling and hasn't flaked off during installation.