براغي قبعة مقبس M18-2.5 × 100 مم | محرك مقبس سداسي | ملولبة جزئيًا | فئة 12.9 فولاذ سبائكي أسود حراري (10 / عبوة)

The black oxide finish on these screws feels really durable, and the hex socket drive made installation a breeze on my jig. They hold tight without slipping, even under heavy load.

These are the first 12.9-grade fasteners I’ve used for a precision assembly, and the black oxide finish is surprisingly uniform. The hex socket drive engages cleanly with no wobble, and the partial threading gave me just the right grip depth. Really solid feel for the price.

Fitted these into a jig I’m building, and the hex socket drive took torque without stripping at all. The thermal black oxide looks even and didn’t flake off during install.