This part of ISO 9974 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 this part of ISO 9974 can be used at working pressures up to 63 MPa
(630 bar1??). The permissible working pressure depends upon the plug end size, materials, design, working
conditions, application, etc.
Conformance to the dimensional information in this part of ISO 9974 does not guarantee rated performance. It
is important that each manufacturer perform testing according to the specification contained in this part of
ISO 9974 to assure that components comply with the performance ratings.
NOTE The Introduction of this part of ISO 9974 gives recommendations for ports and stud ends to be used for new
designs in hydraulic fluid power applications.