ISO 4397:2011规定了与液压和气动流体动力连接器和相关部件一起使用的刚性或半刚性管的标称外径和标称软管尺寸的信息:a）用于流体动力的刚性或半刚性管的标称外径，不考虑材料成分；b） 流体动力用橡胶或塑料软管的标称尺寸列表。

ISO 4397:2011 specifies information on the nominal outside diameters of rigid or semi-rigid tubing and nominal hose sizes to be used with hydraulic and pneumatic fluid power connectors and associated components: a) nominal outside diameters for rigid or semi-rigid tubes, irrespective of material composition, used in fluid power; b) a list of nominal sizes for hoses made of rubber or plastic used in fluid power.