براغي ذات رأس أسطواني #5-44 × 5/8 بوصة | رأس مسطح محرك سداسي | ملولبة بالكامل | فولاذ سبائكي أكسيد أسود حراري (400 / عبوة)

I needed some flat head screws for a precision jig I’m building, and these #5-44 fasteners fit perfectly with their hex socket drive, making assembly much easier. The thermal black oxide finish gives them a nice, uniform look and seems durable so far.

The black oxide finish on these #5-44 screws looks even and consistent across all 400 pieces, which is a good sign for a batch this size. I used them to fasten a small fixture plate and the hex socket drive seated perfectly every time, no stripped heads or wobble.

The hex socket drive grabbed the screw securely without stripping, even when I torqued it into a tight fixture. The black oxide finish looks clean and professional on my tooling setup.