براغي رأس كبس M4-0.7 × 40 مم من هولو-كروم 87050 | رأس مسطح محرك سداسي | فولاد سبائكي أسود حراري (100 / عبوة)

The black oxide finish on these screws makes them look clean and professional on my jig assembly, and the hex drive seated perfectly without any stripping. I’ve used about thirty so far and every one threaded smoothly into predrilled holes.

Bagged all hundred for a machine build and every single one threaded clean into tapped holes without a single dud. The black oxide finish gives them a nice grip for hex keys, and the flat heads sit flush exactly as they should.

Needed a full bag of 40mm M4s for a new jig setup, and every single one threaded clean without any galling. The black oxide coating feels properly slick and evenly applied, so they're going straight into service.