BS EN ISO 4397 standard is for Fluid power connectors and associated components with Nominal
outside diameters of tubes and nominal hose sizes.
This ISO 4397 International Standard 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 fuid power;
b) a list of nominal sizes for hoses made of rubber or plastic used in fuid power.
Nominal outside diameters of tubes shall be selected from the diameters given in Table 1. Nominal hose sizes shall be selected from the sizes given in Table 2.
