Pick the standard (ASME B16.5 or EN 1092-1), the rating (Class 150–2500 or PN 10–100), the nominal size and the flange type — the outside diameter and thickness auto-fill from the standard, and the weight is estimated instantly. Best for blind and plate flanges; weld-neck and slip-on run heavier because of the hub.
Results are indicative; confirm exact mill weights on your MTC. For pipe use the pipe weight calculator.
Treating a flange as a flat ring (a disc with a bore), the estimate is:
Weight (kg) = (π ÷ 4) × (OD² − bore²) × thickness × density ÷ 1,000,000,000
Select the flange type and Class above (the Class sets the standard ASME B16.5 dimensions for that size). This estimate is accurate for blind and plate flanges. Weld-neck and slip-on flanges weigh more because of the hub and raised face, so treat the result as a lower-bound estimate. For exact catalogue weights by type, class and size (ASME B16.5 / B16.47), see our flanges page or ask us.
Send type (WN/SO/blind), class, size and quantity — flanges to ASME B16.5/B16.47 & EN 1092-1 with exact weights.