براغي رأس مقبس M6-1 × 55 مم | محرك سداسي رأس زر | ملولبة بالكامل | فئة 12.9 فولاذ سبائك مطلي بالزنك (200 / عبوة)

Pulled a few of these out for a quick fixture repair, and the hex drive seated perfectly without stripping. The zinc coating has a clean, even finish that held up well against my wrench.

Used a dozen of these in a little jig I'm building, and the hex socket drive seated perfectly without stripping. The 12.9 alloy steel feels properly hard, and every thread was clean out of the package. That's exactly what I wanted for a precision assembly.

The zinc plating is holding up nicely after a week of use in a tight assembly, no rust spots yet. The hex socket drive on these 12.9 grade screws engages cleanly without stripping, which is more than I can say for cheaper packs I've tried.