BS EN ISO 6149-4-2017 用于流体传动和一般用途的管接头.带ISO 261米制螺纹和O形圈密封的油口和螺纹端头.内外六角端口栓塞的尺寸、设计、试验方法和要求
Connections for fluid power and general use. Ports and stud ends with ISO 261 metric threads and O-ring sealing. Dimensions, design, test methods and requirements for external hex and internal hex port plugs