براغي رأس مقبس M6-1 × 30 مم | رأس زر بمحرك سداسي المقبس | ملولبة بالكامل | فئة 12.9 من سبائك الصلب أسود حراري (400 / عبوة)

Pulled these out for a jig I was building, and the black oxide coating handled the tooling oil without any smearing. They thread smoothly into tapped holes, and the 12.9 grade gives me confidence they’ll hold up under load.

The hex socket drive seated perfectly on my driver without any wobble, and the 12.9 alloy steel feels seriously tough. These threads ran smooth into my jig plates, no binding at all. Just wish the box had a better way to separate sizes, but the price for 400 is hard to beat.

Finally got a chance to use these on a jig I've been building and the hex socket drive makes them incredibly easy to install in tight spots. The black oxide finish is holding up well so far even with a bit of oil on my hands.