Connections for hydraulic fluid power and general use -- Ports and stud ends with ISO 261 metric threads and O-ring sealing -- Part 1: Ports with truncated housing for O-ring seal
This standard has been revised by ISO 6149-1:2019
ISO 6149-1:2006 specifies dimensions for metric ports for use with the adjustable and non-adjustable stud ends detailed in ISO 6149-2:2006 and ISO 6149-3:2006.
Ports in accordance with ISO 6149-1:2006 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 port size, materials, design, working conditions, application, etc. See ISO 6149-2:2006 and ISO 6149-3:2006 for pressure ratings.