Four bolt split flange hose fittings is designed by ISO 12151-3 and SAE J516 section 20, it is hose fittings with ISO 6162-1 or ISO 6162-2 flange ends.
ISO 12151-3 types of SAE code 61 code 62 flagne hose fittings as follows:
Dimensions of straight flange hose fittings (S)
Dimensions of 45° elbow flange hose fittings (E45)
Dimensions of 90° elbow flange hose fittings (E)
Dimensions of 22,5° elbow flange hose fittings (E22)
Dimensions of 30° elbow flange hose fittings (E30)
Dimensions of 60° elbow flange hose fittings (E60)
Dimensions of 67,5° elbow flange hose fittings (E67)
ISO 12151-3 specifies the general and dimensional requirements for the design and performance of flange hose fittings, made of carbon steel, for nominal hose inside diameters of 12,5 mm to 51 mm inclusive, in accordance with ISO 4397, for use with ports and clamps in accordance with ISO 6162-1 and ISO 6162-2.
The working pressure of the hose assembly shall be the lower of the pressures given for its flange style (pressure series) and size in ISO 6162-1 or ISO 6162-2, and in the relevant hose specification
The Split Flange hose fitting portion of a hose assembly shall be tested in accordance with ISO 19879, and the complete hose assembly shall be tested in accordance with ISO 6605.