This part of ISO 11926 specifies dimensions, performance requirements and test procedures for
adjustable and non-adjustable heavy-duty (S series) stud ends complying with ISO 725 and for their
related O-rings, for general use and fluid power applications. It also specifies the designation of
these stud ends.
Stud ends in accordance with this part of ISO 11926 may be used at working pressures up to 63 MPa
(630 bar for non-adjustable stud ends, and 40 MPa (400 bar) for adjustable stud ends. The permissible
working pressure depends upon the stud end size, materials, design, working conditions, application, etc.
For threaded ports and stud ends specified in new designs in hydraulic fluid power applications,
only ISO 6149 is to be used. Threaded ports and stud ends in accordance with ISO 1179, ISO 9974 and
ISO 11926 are not to be used for new designs in hydraulic fluid power applications.
Conformance to the dimensional information in this part of ISO 11926 does not guarantee rated
performance. Each manufacturer should perform testing according to the specification contained in
this part of ISO 11926 to assure that components comply with the performance ratings.
NOTE 1 Significant testing over 40 years has confirmed the performance requirements of ports complying
with ISO 11926-1 and of stud ends complying with this part of ISO 11926; the latter are identical to those
complying with SAE J 1453.