This part of ISO 12151 specifies the general and dimensional requirements for the design performance of 37°flared hose fittings in accordance with ISO 8434-2,made of carbon steel,for nominal hose sizes of 6,3 mm through 51 mm inclusive in accordance with ISO 4397. These hose fittings (see Figure 1 for a typical example)are for use in hydraulic fluid power systems with hose that meets the requirements of the respective hose standards and in general applications with suitable hose.