nominal inside diameter meaning in English

标称内径
通称内径

Fluid power systems and components - connectors and associated components - nominal outside diameters of tubes and nominal inside diameters of hoses
液压气动系统用硬管外径和软管内径
Fluid power systems and components . connectors and associated components . nominal outside diameters of tubes and nominal inside diameters of hoses
流体动力系统和部件.连接器和相关部件.导管的公称外径和软管的公称内径