DIN EN ISO 898-3:2018 碳钢和合金钢制紧固件的机械性能.第3部分:具有特定性能等级的平垫圈(ISO 898-3-2018); 德文版本EN ISO 898-3-2018
Mechanical properties of fasteners made of carbon steel and alloy steel - Part 3: Flat washers with specified property classes (ISO 898-3:2018); German version EN ISO 898-3:2018