براغي ذات رأس مقبس M4-0.7 × 16 مم | رأس زر بمحرك سداسي المقبس | ملولبة بالكامل | فولاذ سبائكي فئة 10.9 مع أكسيد أسود حراري (800 / عبوة)

I needed a batch for jig repairs and these button heads have a nice, consistent thread that seats perfectly. The black oxide coating seems durable and hasn't chipped during installation.

Was rebuilding a jig for a small CNC setup and these M4s came through the box with zero damaged threads, which is rare for bulk hardware. The hex socket drive seated cleanly every time, and the thermal black oxide has a nice grippy texture that holds up to handling.

The black oxide finish on these screws looks great and seems to resist wear better than the plain steel ones I've used before. They seated perfectly in my jig's threaded holes without any binding. Exactly what I needed for a precise assembly project.