DS/EN ISO 9974-3:2001
一般用途和流体动力连接件 带 ISO 261 螺纹的端口和螺柱端,带弹性体或金属对金属密封 第3部分:带金属对金属密封的螺柱端(B 型)
Connections for general use and fluid power - Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing - Part 3: Stud ends with metal-to-metal sealing (type B)