ASME B16.47

Large Diameter Flange Dimensions

Dimensional data for Series A and Series B large-diameter flanges, covering NPS 26″ to 60″ and pressure classes 75 through 900.

26″–60″ NPS Range

2 Flange Series

6 Pressure Classes*

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ASME B16.47 Series A and Series B weld neck and blind flange dimensional illustrations

Browse Series A & B

Explore large-diameter flange dimensions by series, pressure class, and flange specifications.

ASME B16.47 Series A

ASME B16.47 Series A flange dimensions for NPS 26″–60″, including bolt circle, bolt holes, flange OD, and thickness.

Large-diameter flanges · Oil & gas · Power

Pressure class

Class 150 Class 300 Class 400 Class 600 Class 900

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ASME B16.47 Series B

ASME B16.47 Series B flange dimensions for NPS 26″–60″, including bolt circle, bolt holes, flange OD, and thickness.

Large-diameter flanges · Refinery · Petrochemical

Pressure class

Class 75 Class 150 Class 300 Class 400 Class 600 Class 900

View Series B Dimensions

Note: Series A and Series B use different bolt circle diameters, bolt hole counts, and flange OD/thickness for the same nominal class. Always confirm the series before ordering.

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