Technical Flange Calculator
ASME B16.5 dimensions, bolting pattern and weight estimates for 14 flange types — computed live, with a PDF datasheet and a one-click request-a-quote that carries your selection across.
- 1Configure the flange — dimensions, bolting and weight update live
- 2Press Request a Quote — the selection travels with you and we reply within one business day
Selection
ASME / ASTMReleased against your drawing
ASME B16.47 Series A covers NPS 26 – 60. Bolting and outside-diameter data for these large diameters is issued with the project specification rather than from a public table, so we quote it against your line list and return a certified drawing.
Weight is project spec dependent
The bolting pattern and outside diameter above are the standard values for this size and class. The weight of this type depends on the hub length, facing and your pipe schedule, so it is confirmed against the approved drawing.
The PDF datasheet is generated on our server — dimensions, bolting and weights exactly as shown here.
Finished dimensions
mm / inBolting specifications
ASTM A193 / A194Weight breakdown
net / grossHow these numbers are derived
Dimensions. Outside diameter, minimum thickness, bolt circle diameter, bolt-hole count and bolt diameter are the published ASME B16.5 values, stored in inches exactly as the standard states them and converted at 1 in = 25.4 mm. Bores follow ASME B36.10 Schedule 40 / STD inside diameter.
Bolting. Stud length is sized to pass through two flanges of this class and engage both nuts: 2T + 2.5d + 6 mm, rounded up to the nearest 5 mm. Wrench size is the standard hex across-flats, 1.5 × stud diameter. Recommended stud and nut grades follow the material group.
Weights. Modelled as a solid of revolution — the raised-face disc plus the hub — at 7,850 kg/m³ for carbon steel, multiplied by the material density factor (stainless and duplex follow the family densities published on our material pages). Blind and spectacle types are computed as a solid disc at the thicker blind-flange section. Gross shipping weight adds 12% for export packing (crate, VCI wrapping and pallet).
Please verify before manufacture. These figures are reference values for budgeting, freight planning and enquiry sizing. For purchase, fabrication or third-party inspection, work from the current ASME B16.5 / B16.47 tables, the approved drawing and the EN 10204 Type 3.1 mill certificate. Tell us if a value looks wrong and we will correct it — the data sits in one block in api/lib/flange-data.php on our server, and the server recomputes every PDF it sends.
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