DIN 267-3
紧固件 技术交货条件 碳钢和合金钢螺栓及螺钉的性能等级 性能等级转换
Fasteners Technical delivery conditions Property classes for carbon steel and alloy steel bolts and screws Conversion of property classes
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Fasteners Technical delivery conditions Property classes for carbon steel and alloy steel bolts and screws Conversion of property classes