M22-2.5 X 260mm براغي رأس سداسية داخلية | محرك سداسي | خيط جزئي | فولاذ سبائكي فئة 12.9 أكسيد أسود حراري (5 / عبوة)

Installed these in a custom press fixture and the black oxide finish held up perfectly against some pretty aggressive clamping pressure. The partially threaded design gave exactly the right grip depth for my 30mm steel plate.

I paired these with some heavy jig tooling, and the 12.9 alloy steel handled the torque without any distortion. The partially threaded length gave me just the right grip depth for my assembly, and the hex socket drive seated cleanly every time.

I was a little worried these would be too short for my jig setup, but the 260mm length gave me exactly the reach I needed. The black oxide finish seems tough and hasn't chipped during installation.