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ISO 10644:2009
Screw and washer assemblies made of steel with plain washers - Washer hardness classes 200 HV and 300 HV
ISO 10644:2009 specifies the requirements for metric screw and plain washer assemblies made of steel with coarse thread M2 to M12 inclusive, flat seating heads, property classes up to and including 10.9 and washer hardness classes 200 HV or 300 HV. The plain washers are captive, i.e. prevented from disassembly and free to rotate.
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International Organization for Standardization [iso]
International Organization for Standardization [iso]