ISO 8434-1:2018 is newest version standard for metric hydraulic fittings with 24 degree cone connector, is equal to DIN 2353 standards tube fittings. It is most popular German hydraulic fittings, in European hydraulic fittings market, also called ISO hydraulic fittings.
Two types of 24 degree cone fittings including male 24 deg cone connecctor cutting ring, 24 deg cone connector with o-ring seal cone DKO end.
For ISO tube fittings bodies manufactured from stainless steel and copper alloys, the pressure/temperature ratings need to be defined by the manufacturer.
ISO 8434-1:2018 PDF document specifies the general and dimensional requirements for 24° cone connectors using cutting ring and O-ring seal cone (referred to as DKO) suitable for use with ferrous and non-ferrous tubes with outside diameters from 4 mm to 42mm inclusive.
These DIN 24 tube connectors are for use in fluid power and general applications within the limits of pressure and temperature specified in this document.
They are intended for the connection of plain end tubes and hose fittings to ports in accordance with ISO 6149-1, ISO 1179-1 and ISO 9974-1. (See ISO 12151-2 for a related hose fitting specification.)