Markings are required in Section 4 of ASME B16.9. Each fitting shall be permanently marked to show the following:

  • manufacturer’s name or trademark, (logo)
  • material identification, either the ASTM or ASME grade designation, (ASTM A234 WPB)
  • schedule number or nominal wall thickness in mm, (S120)
  • size the nominal pipe size (NPS) identification number related to the end connections shall be used, (8×6)
  • compliance — see for standard and special fitting marking
  • Additional markings, (heat number)

A manufacturer may supplement these mandatory markings with others, including a DN size designation, but confusion with the required marking shall be avoided.

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