ISO 9974-3:1996
通用和液压传动用联接件 带ISO 261弹性螺纹或金属-金属密封的气门和双头螺栓端头 第3部分:金属-金属密封的双头螺栓端头(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)