#4-40 × 1/2" براغي رأس مسطحة بمقبس سداسي مع كتلة نايلون، ملولبة بالكامل، فولاذ سبائكي مع أكسيد أسود حراري (100/عبوة)

The black oxide finish gives them a nice, uniform look, and the hex socket drive fits my drivers perfectly without any stripping. They’ve held up solidly in a couple of precision fixtures I’ve been building, so I’m glad I stocked up.

Needed some precise fasteners for a jig I was building, and these #4-40s fit the hex socket perfectly. The black oxide finish feels durable and the nylon pellet gives a nice lock on the threads.

The nylon pellet locking feature on these #4-40 screws is a game changer for keeping my jig adjustments secure, and the black oxide finish looks great on my tooling. I was worried about threading such small fasteners, but the hex socket drive made installation smooth and precise.