ISO 9974-4:2006

Connections for general use and fluid power — Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing — Part 4: Dimensions, design, test methods and requirements for external hex and internal hex port plugs

Scope

ISO 9974-4:2006 specifies dimensions and performance requirements for metric external hex and internal hex port plugs for use with ISO 9974-1 ports.
Port plugs in accordance with ISO 9974-4:2006 can be used at working pressures up to 63 MPa (630 bar). The permissible working pressure depends upon the plug end size, materials, design, working conditions, application, etc.