The SAE J1926-1 standard refers to the specifications for straight thread O-ring ports. It’s crucial to know that while it aligns with the MS16142 standard, it does not adhere to the MS33649(8). This standard is synonymous with the ISO 11926-1, ensuring a global alignment in specifications and standards.
Port Details Explained
For the port details in SAE J1926-1 (ISO 11926-1), here are some essential things to note:
- Nominal Tube Diameter: The nominal tube outer diameter is mentioned in standard inch sizes, and their equivalent millimeter sizes are also provided for reference. However, it’s crucial to remember that these figures are only for reference. Any boss size can be used for a tubing size depending on various other design criteria.
- Face of Boss: If the face of the boss is located on a machined surface, specific dimensions (d2 and L3) may not necessarily apply. However, it’s still necessary to maintain a corner radius R0.1-0.2.
- Diameter Concentricity: The diameter d5 must be concentric with the thread pitch diameter within a tolerance of 0.004 in (0.1mm) FIM. It should be devoid of any longitudinal and spiral tool marks, although annular tool marks up to 100 µin (2.5µm) maximum are permissible.
- Tap Drill Depths: The specified tap drill depths are applicable only when using bottoming taps to achieve the required full thread lengths. If standard taps are used instead, the tap drill depths should be increased accordingly.
- Maximum Spotface Depth: A maximum recommended spotface depth is mentioned to ensure that there’s adequate wrench grip for properly tightening the fitting or locknut.
- Material Specification: For hydraulic applications, a 90-durometer nitrile is standardized, ensuring the durability and effectiveness of the O-ring ports in such contexts.
Conclusion
Understanding these specific technical details is fundamental in ensuring the appropriate selection and use of O-ring ports conforming to the SAE J1926-1 (ISO 11926-1) standard. Adequate adherence to these standards guarantees not only the efficiency and functionality of the ports but also their compatibility and longevity in various applications.
Incorporating these insights into the design and utilization process can significantly mitigate the risks of operational failures, ensuring optimal performance and enhancing the overall efficiency and reliability of hydraulic systems.
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