This is the size differences between a 150 to 2500, 4" weld neck flange.


  • ASME B16.5 are flanges for sizes 1/2" to 24".
  • ASME B16.47 Series A and B are large diameter flanges for sizes 26" to 60".
    • Series A / MSS SP-44
      • For general use
      • Bolt circle diameter is larger than Series B
      • NOT interchangeable
    • Series B / API Std 605 (cancelled)
      • For compact use
      • Bolt circle diameter is smaller than Series A
      • NOT interchangeable

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This category has only the following subcategory.

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