ISO 12151-4:2007 specifies the general and dimensional requirements for the design and performance of ISO 6149 metric stud end hose fittings made of carbon steel, for nominal hose inside diameters of 6,3 mm through 38 mm inclusive, in accordance with ISO 4397.

These hose fittings 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 hoses.