Many of our clients don’t know what’s ISO 9974 standard. Today this blog will explain everything to make you fully understand.
ISO 9974 is the connections for general use and fluid power — Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing, which includes:
Part 1: Thread ports
ISO 9974-1:1996 Specifies dimensions for ports with ISO 261 threads and elastomeric (type E) or metal-to-metal (type B) sealing for general use and in fluid power applications with the stud ends detailed in ISO 9974-2 and ISO 9974-3. It also specifies test methods and the designation of these ports.
Part 2: Stud ends with elastomeric sealing (type E)
ISO 9974-2:1996 specifies dimensions, performance requirements and test procedures for heavy-duty (S series) and light-duty (L series) stud ends with ISO 261 threads and the elastomeric sealing that is used with them. It also specifies the designation of these stud ends and their elastomeric sealing.
Part 3: Stud ends with metal-to-metal sealing (type B)
ISO 9974-3:1996 specifies dimensions, performance requirements and test procedures for heavy-duty (S series), light-duty (L series) and extra-light-duty (LL series) stud ends with ISO 261 threads and metal-to-metal sealing. It also specifies the designation of these stud ends.
Part 4: Dimensions, design, test methods and requirements for external hex and internal hex port plugs
ISO 9974-4:2016 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 document can be used at working pressures up to 63 MPa [630 bar[1]]. The permissible working pressure depends upon the plug end size, materials, design, working conditions, application, etc.
Conformance to the dimensional information in this document does not guarantee rated performance.
NOTE The Introduction of this document gives recommendations for ports and stud ends to be used for new designs in hydraulic fluid power applications.
[1] 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
The Difference Between ISO 9974 and ISO 1179
ISO 9974 is the ports and stud ends with ISO 261 metric threads, but ISO 1179 is the port and stud ends with ISO 228-1 BSPP threads.
Hydraxio is a leading manufacturer and supplier of ISO 9974 and ISO 1179 standard fittings and adapters, please feel free to contact us for more details.