I require A4 grade stainless steel studding, nuts, and washers, in M12 size, to affix decking bearers to an ancient wall. The studs will be resin bonded into the wall. The wall is also the boundary of a stream, so the fixings will be exposed to high levels of moisture, and occasionally, be immersed at times of heavy rain. The decking will run from the garden, across the stream, to the wall, supported on the bearers.
Warehouse Direct and ship's chandlers don't sell suitable products.
Question is, who does??