براغي ذات رأس أسطواني M6-1 × 18 مم | رأس مسطح محرك سداسي | خيط كامل | فئة 12.9 من سبائك الصلب مطلي بالزنك (400 / عبوة)

Packed these into a precision fixture I'm building and the flat head sits perfectly flush every time. The 12.9 alloy steel feels seriously tough, and the zinc plating has a nice even coating that should resist rust well.

The hex socket drive seated cleanly on my Allen key without any wobble, and the zinc plating looks uniform across all 400 pieces. I’ve used about 80 so far in a precision assembly and not a single one has stripped or fought the thread.

These fit perfectly in my jig setup, and the hex socket drive made installation quick with no stripping. The 12.9 alloy steel feels much tougher than the standard bolts I was using before.