DS DS/EN ISO 7089
DS DSEN SO 7089 2000-NOV-15 Plan washers - Normal seres - Product grade A
This International Standard specifies the characteristics of normal series, of product-grade-A plain washers in the 200 HV and 300 HV hardness classes and of nominal sizes (nominal thread diameters) ranging from 1,6 mm to 64 mm inclusive.