GB/T 1231-2024
Washers for high strength steel structural-A
GB/T 1231-2024
Washers for high strength steel structural-B
GB/T 32076.11-2024
High-strength structural bolting assemblies for preloading-Part 11:Load Indicating Washer
DIN 440-2024
Extra large washers with square hole for use in timber constructions—Type V