Metric stud o-ring hose fittings is designed by ISO 12151-4 and SAE J516 section 21.It is Hydraulic Hose fittings with ISO 6149 metric stud ends, straight thread O-ring hose fittings.
ISO 12151-4 types of Hose fittings with ISO 6149 metric stud ends as follows:
Dimensions of straight stud hose fittings (SDS)
Dimensions of 90° adjustable stud elbow hose fittings (SDE)
ISO 12151-4 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.
ISO 12151-4 Hose assemblies shall meet the performance requirements specified in the appropriate hose specification without leakage or failure when tested in accordance with ISO 6605.
The ISO 12151-4 working pressure of the hose assembly shall be the lower of the pressures for that size given in ISO 6149-2 or ISO 6149-3 for the end connection or in the relevant hose specification.
The working pressure of the hose fitting shall be verified through testing conducted in accordance with ISO 19879, but the entire hose assembly shall be tested in accordance with ISO 6605. During the cyclic endurance test, the hose fitting shall be subjected to the number of cycles specified in the relevant hose specification.