BS ISO 9974-4-2016 一般用途和流体动力用连接件.带弹性体密封件或金属对金属密封件的ISO 261螺纹的孔口和螺柱端.内外六角气门栓的尺寸、设计、试验方法和要求
Connections for general use and fluid power. Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing. Dimensions, design, test methods and requirements for external hex and internal hex port plugs