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ISO 10644:1998 Screw and washer assemblies with plain washers - Washer hardness classes 200 HV and 300 HV
standard by International Organization for Standardization, 08/01/1998
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This International 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.
The plain washers are captive, i. e. prevented from disassembly and free to rotate.