DS DS/EN ISO 10644
DS DSEN SO 10644 2009-JUL-20 Screw and washer assembles made of steel wth plan washers - Washer hardness classes 200 HV and 300 HV
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This European Standard specifies the requirements for metric screw and plain washer assemblies with coarse thread M2 to M12 inclusive, flat seating heads, property classes up to and including 10.9 and washer hardness classes 200 HV and 300 HV.