براغي رأس أسطوانية M24-3 X 50mm | محرك سداسي داخلي | ملولبة بالكامل | فئة 12.9 سبيكة فولاذ مطلية بالزنك (10/عبوة)

I was worried about the Class 12.9 hardness being overkill for my jig, but these bolts threaded in smoothly and the zinc plating seems resistant to shop grime. The 10-pack gives good value for precision assemblies.

The threads are perfectly clean and the zinc plating looks even across all ten, so these went into my precision assembly without any rework. For a 12.9-grade bolt, the fit in the tapped holes felt snug and solid right out of the package.

Installed these in a jig I'm building and the 12.9 alloy steel feels rock solid under torque. The zinc plating gives them a clean, even finish that should resist rust well.