براغي رأس أسطوانية M16-2 × 55 مم | رأس مسطح محرك سداسي | خيط كامل | فولاد سبائكي فئة 12.9 مطلي بالزنك (50 / عبوة)

The hex socket drive seated my allen key perfectly the first time, no wobble or stripping. These 12.9-grade screws feel like they'll hold a machine frame together for years, and the zinc plating gives them a clean, uniform finish straight out of the pack.

Pulled out my calipers when these arrived and the threads are clean and uniform across all fifty pieces, no burrs or plating issues. The 12.9 alloy steel feels seriously dense in hand, and the hex socket seated perfectly on my driver without any wobble.

Got these for a batch of heavy-duty tooling fixtures and the 12.9 alloy steel holds up way better than I expected under high torque. The hex socket drive seated cleanly without any stripping, even after tightening them down pretty hard.