براغي رأس مقبس #3-56 × 7/16 بوصة | محرك مقبس سداسي | ملولبة بالكامل | فولاذ سبائك مع أسود حراري (200 / عبوة)

I needed some small fasteners for a jig I'm making, and these 3-56 screws with the hex socket drive fit perfectly. The black oxide coating looks uniform and should resist rust in my workshop.

The black oxide finish on these screws gave them a nice, uniform look against the aluminum plate I used them on, and the hex socket drove smoothly without stripping. For precision work like building a small CNC router mount, this pack is exactly what I needed.

Installing these in a small jig fixture and the threads caught perfectly on the first try, no cross-threading at all. The black oxide finish seems durable enough for repeated assembly work.