Thickness varies
of the 130 I ordered, quite a lot were 2mm smaller on thickness than the nominal size (they are cut to thickness so I expect maybe +-0.5. Not great when sold as a spacer. Also had a few that were M12 rather then the M10 I ordered.
Stainless Steel Hardware for marine use
I needed specific hardware for a boat trailer modification. U Bolts R Us could met all my requirements for size and material, and were quite happy and competitive on small quantities. Hardware looks to be well made and to spec.
Most competitive company I could fine so will definitely use again.