DS DS/EN ISO 7090
DS DSEN SO 7090 2000-NOV-15 Plan washers chamfered - Normal seres - Product grade A
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This International Standard specifies the characteristics of normal-series, product-grade-A plain washers chamfered at the outside diameter, in the 200 HV and 300 HV hardness classes and of nominal sizes (nominal thread diameters) ranging from 5 mm to 64 mm inclusive.