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BS EN 14399 Part 5: Plain Washer Mechanical Properties Requirement Vickers hardness 300 HV to 370 HV BS EN 14399-5: High-strength structural bolting assemblies for preloading. Plain washers BS EN 14399 Part 6: Plain Chamfered Washer Mechanical Properties Requirement Vickers hardness 300 HV to 370 HV BS EN 14399-6: High-strength structural bolting assemblies for preloading.
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