Threaded Flange

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trhf flange 1IMG 4485The threaded flange, abbreviated as TRHF, is similar to a slip-on flange, but has internal threads.  It is normally used for low pressure and not used where temperature or stress is very high.  This flange has a raised face.

Threaded Flange Index





Threaded Flange Advantages and Disadvantages

  • Threaded flanges are relatively easy to install without the need for welding.  This can be advantageous in situations where welding is impractical or undesirable.
  • The absence of welding makes threaded flanges suitable for applications where welding is not permitted or is considered a safety hazard.
  • Threaded flanges are commonly used for small diameter pipes, and they provide a convenient and cost effective solution for these applications.
  • Threaded connections allow for easy disassembly and reassembly of the piping system.  This can be beneficial for maintenance, repairs, or modifications to the system.
  • Threaded flanges are suitable for low pressure applications where the threaded connection provides sufficient strength.
  • Threaded flanges are generally not recommended for high pressure and high temperature applications.  The threaded connection may not provide the same level of strength as welded connections.
  • The threaded connection may be more prone to leakage compared to welded connections, especially if proper sealing techniques are not employed.
  • Achieving precise rotational alignment during installation can be challenging with threaded connections.  This can be a limitation in applications where precise alignment is critical.
  • Threaded connections are susceptible to loosening due to vibration.  In high vibration environments, additional measures such as thread locking compounds may be required to prevent unintentional loosening.
  • Threaded flanges are typically used for smaller diameter pipes.  For larger diameter pipes or high pressure systems, other types of flanges may be more appropriate.
  • The threaded connection may not provide the same level of structural integrity as welded connections, making threaded flanges less suitable for applications with high structural demands.
  • Threads can wear over time, leading to potential issues with the connection.  Care must be taken during installation and maintenance to avoid thread damage.


Threaded Flange Datasheets

The datasheets we have on this site are shown below.  For simplicity sake, only datasheets that adhere to B16.5 are shown. ASME B16.5 covers flange dimensions from ½” to 24”.  For sizes larger than this, please visit our flange datasheets page.

ClassFlat FaceRaised FaceRing Type Joint
ANSI 150 THD Flange ANSI 150 FF (in) THD Flange ANSI 150 RF (in) THD Flange ANSI 150 RTJ (in)
ANSI 300 THD Flange ANSI 300 FF (in) THD Flange ANSI 300 RF (in) THD Flange ANSI 300 RTJ (in)
ANSI 400 THD Flange ANSI 400 FF (in) THD Flange ANSI 400 RF (in) THD Flange ANSI 400 RTJ (in)
ANSI 600 THD Flange ANSI 600 FF (in) THD Flange ANSI 600 RF (in) THD Flange ANSI 600 RTJ (in)
ANSI 900 THD Flange ANSI 900 FF (in) THD Flange ANSI 900 RF (in) THD Flange ANSI 900 RTJ (in)
ANSI 1500 THD Flange ANSI 1500 FF (in) THD Flange ANSI 1500 RF (in) THD Flange ANSI 1500 RTJ (in)
ANSI 2500 THD Flange ANSI 2500 FF (in) THD Flange ANSI 2500 RF (in) THD Flange ANSI 2500 RTJ (in)


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