براغي رأس أسطوانية M6-1 × 16 مم | رأس مسطح محرك سداسي | خيط كامل | سبيكة فولاذ فئة 12.9 مطلي بالزنك (400/عبوة)

Pulled these out for a jig I was building and the 12.9 alloy steel feels noticeably tougher than standard hardware store bolts. The flat head sits flush with just a slight countersink, and the zinc plating has held up fine so far.

The hex socket drive seated perfectly on my driver with zero wobble, and the zinc plating looks uniform across all 400 pieces. I've swapped out a whole batch of worn bolts in my tooling rigs and these hold torque like they're welded in place.

I've been using these in some jig builds and the flat head design sits perfectly flush, which saves me from having to counter-sink manually. The 12.9 grade holds torque well on hardened steel parts.