براغي رأس مقبس M3-0.5 × 22 مم | محرك سداسي مسطح الرأس | ملولبة جزئيًا | فئة 12.9 سبيكة فولاذ أسود حراري (400 / عبوة)

Bought these for a jig I'm building and the 22mm length was exactly right for the threaded portion to bite cleanly without bottoming out. The black oxide finish looks sharp and the Class 12.9 steel gives them a reassuring heft. Pack of 400 means I won't run out for years.

The hex socket drive makes installing these into tight jig spots a breeze—no stripping, even with repeated use. The black oxide finish seems durable and cleanly done, no flaking after a few tightenings. Exactly the precision I needed for small machinery repairs.

I needed a batch of small fasteners for a jig I'm building, and these 12.9-grade screws are noticeably harder than the standard ones I've used before. The black oxide finish looks clean and hasn't chipped during installation.