براغي رأس مقبس M4-0.7 × 22 مم | محرك مقبس سداسي | خيط كامل | فئة 12.9 فولاذ سبائكي أكسيد أسود حراري (600 / عبوة)

These bolts threaded perfectly into my aluminum jig without any binding, and the black oxide finish looks clean and professional. The hex socket drive didn't strip even under my impact driver's full torque.

Class 12.9 hardness really shows when you're torquing these into a jig—no stripping at the socket, and the black oxide finish holds up beautifully against shop grime. At 22mm they're the perfect length for the tooling I'm building, and having 600 on hand means I won't run out mid-project.

Used these for a jig I'm building and the hex socket drive seated perfectly every time, no stripped heads. The black oxide finish looks clean and the 12.9 alloy steel feels seriously rigid for the price. A full box of 600 for less than a coffee run is hard to beat.