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Flange Index

Note: Dimensions of the most popular flanges (Plate, Boss, and Weld-neck) are provided for the obsolete BS4504 flanges and the current BS EN 1092-1 flanges.  In practice the dimensions are similar in all but a few minor dimensions.

BS4504 PN16 Flanges
BS EN 1092-1 PN16
BS4504 PN25 Flanges
BS EN 1092-1 PN25
BS4504 PN40 Flanges
BS EN 1092-1 PN40
BS 1600 Pipes BS3600 Pipes Pipe Threads

Note: Standard BS 4504 is now superseded by
BS EN 1092-1:2002 Flanges and their joints. Circular flanges for pipes, valves, fittings and accessories, PN designated. Steel flanges
BS EN 1092-2:1997 Flanges and their joints. Circular flanges for pipes, valves, fittings and accessories, PN designated. Cast iron flanges
BS EN 1092-3:2003 Flanges and their joints. Circular flanges for pipes, valves, fittings and accessories, PN designated. Copper alloy flanges
BS EN 1092-4:2002 Flanges and their joints. Circular flanges for pipes, valves, fittings and accessories, PN designated. Aluminium alloy flanges
BS EN 1515-1:2000 Flanges and their joints- Bolting: selection of bolting.
BS EN 1515-2:2000 Classification of bolt material for steel flanges PN designated.

BS 3600:1997 :Specification for dimensions and masses per unit length of welded and seamless steel pipes and tubes for pressure purposes
.. Is withdrawn and replaced By BS EN 10220:2002..Seamless and welded steel tubes. Dimensions and masses per unit length


Links Includng Information on Flange Pipe Sizes
  1. Irish Associates.. ANSI Pipe and Flange Dimensions(Imperial)
  2. Thermo Metrics .. ANSI Flange Dimensions and Weights (Imperial)
  3. SANDVIK.. Downloadable Catalog of Din Flange dimensions
  4. Red Bag.. -> Free Engineering Tools -Flange Dimensions/ Pipe Size and much more
  5. Pipeng...Site includes various engineering calculations. Works best with Firefox

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Last Updated 23/01/2013