Not sure How hard they are. They are not regular stainless. I told them my application and they provided the hardest they have. Real cheap like $0.33 for two bolts, washers and nylon lock nuts.What grade?
All I can seem to find is just your run of the mill stainless bolts in a 5mm or 3/16".
Anyone else had any luck finding anything stronger? Source?
What little bit of research I've done, it doesn't look like there's really any other options.