M6-1 x 16mm 六角頭螺絲 | 等級10.9 鋼 鍍鋅 | 全螺紋 (500個/包)

Installed these on a conveyor guard last week—the class 10.9 rating gave me confidence they'd hold up under vibration. Zinc plating looks clean and even, no burs on the threads.

Used these to rebuild a jig on a production line and every single bolt seated cleanly without stripping. The zinc coating is even and consistent across all 500, which makes a difference when you're torquing to spec.

Went through almost the entire box mounting brackets on a frame jig, and the zinc plating held up nicely without any rust where I scratched a few. The 10.9 hardness means they torqued down solid without stripping, which is exactly what I need for repeated adjustments.