براغي رأس مقبس M10-1.5 × 20 مم | محرك مقبس سداسي | ملولب بالكامل | فئة 12.9 سبائك فولاذية أكسيد أسود حراري (200 / عبوة)

I needed a batch of these for a jig I’m building, and the black oxide coating shows no signs of chipping under torque. They’re fully threaded, so I had no trouble getting a full bite into the alloy steel the mounting plate is made of.

The black oxide finish looks great and the threads are perfectly clean on all 200 pieces. These are holding up really well in my jig setup where I need a solid, precision fit every time.

I was a bit worried about the black oxide coating chipping during installation, but the hex socket drive seated perfectly and the threads cut cleanly into my jig's holes without any fuss. They've held up well under load so far, which is all I really need from a Class 12.9 screw.