Dimensions Weld Neck & Blind flanges ASME B16.47 series A

Class  150 | 300 | 400 | 600 | 900

26 | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 | 48
Weld Neck and Blind flange

Important  Information

Indications:
  • OD = Diameter at Weld Bevel
  • D = Overall Diameter of Flange
  • B (WNF) = Minimum Thickness of Welding Neck Flange
  • B (BLF) = Minimum Thickness of Blind Flange
  • H = Length thru Hub
  • A = Diameter at Base of Hub
  • G = Outside Diameter of Raised Face
  • K = Bolt Circle Diameter
  • L = Diameter of Bolt Holes
General notes:
  • Dimensions are in millimeters unless otherwise indicated.
  • For dimensions "B" and "H", see important information on the top right of the image.
  • Blind flanges ASME B16.47 series A flanges (≥ NPS 26) are MSS SP-44 flanges.
    ASME has incorporated the MSS-SP44 specification into B16.47 Series A and the API 605 Specification into B16.47 series B.
    These specification include only Welding Neck and Blind Flanges.
  • Dimensions for Classes 400, 600 and 900 NPS 38 and larger for Series B flanges are the same as for the Series A flanges.
  • The length of the Stud Bolt does not include the height of the chamfers (points).
Measuring lengths of Stud Bolts and Hex bolts

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