Hexagonal Nuts Metric Thread Fine Pitch (ECR HU Fine Pitch)
Inox A4 - DIN 934
There is a variant in Inox A2 This nut can be combined with a DIN 933 metal screw or a DIN 931 metal screw and a medium type M flat washer NFE25513
Hexagonal self-locking nuts - All metal (ECR INDESS All metal / STOVER)
A4 stainless steel - DIN 980 TYPE (DIN 934 base)
There is a variant in A2 stainless steel