M6 d. 6.4x18x1.0 ZINC Washers with outside diameter = 3 x nominal thread diameter ČSN 02 1726.15
Firma Killich s.r.o. offers rivet washers DIN 9021. The range of rivet washers DIN 9021 includes stainless steel A2, A4, steel, galvanized, polyamide, blackened, nickel-plated.