BN 20187 | DIN 6796Conical spring washers for fastening jointsSpring steel, mechanical zinc plated blue
BN 30721 | DIN 6796Conical spring washers for fastening jointsSpring steel, mechanical zinc plated yellow
BN 65363 | DIN 6796Conical spring washers for fastening jointsSpring steel, Zinc flake coated ISO 10683/flZnL/nc/480h/C (µ=0.12-0.18)