براغي رأس مقبس M2.5-0.45 × 8mm | رأس زر بمقبس سداسي | كامل الخيط | فولاذ سبائكي فئة 12.9 مؤكسد أسود حراريًا (900/عبوة)

I was pleasantly surprised by how well the black oxide finish holds up; after installing a few in a jig they show no wear at all. The 12.9 alloy steel feels noticeably tougher than the stainless I've used before.

The hex socket drive engages perfectly with my driver—no stripping, even at higher torque. These 12.9 alloy screws feel exceptionally hard and durable for precision tooling. Exactly what I needed for small-scale machinery fixturing.

Used a handful of these in a small CNC fixture and the black oxide finish held up great against coolant spray. They thread in smooth and the hex drive grabs perfectly with a 2mm bit—no stripping at all. Exactly the right spec for precision work.