LEKE PIPING / TECHNICAL CALCULATOR
Lap joint flange
weight calculator
Select a size, pressure class and material to estimate backing flange weight and explore its geometry.
Configure your flange
ASME B16.5 reference sizes · Classes 150 / 300 / 600
One backing flange only. Stub end, gasket and bolting are excluded. No raised face is added to the backing flange.
Interactive 3D model
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Dimensions D, B, C, H, X, bolt circle, hole count and hole diameter follow the selected reference row. The stub-end side includes the specified lap radius R. The cylindrical outer hub contour is illustrative; confirm the finished manufacturing drawing.
Reference dimensions
Millimetres, except hole count. NPS 1/2–24: 20 sizes per class.
How the estimate works
Plate annulus minus bolt holes, plus a hub estimate, minus a rounded bore-entry allowance. The displayed midpoint lies between a tapered hub ending at the bore diameter and a cylindrical hub. This geometric range is not a manufacturing tolerance.
Density is an assumed value for the selected material family. Actual grade, finished contour and machining affect the final weight.
Check before ordering
Confirm the current standard edition, finished drawing and mating stub end. The radius provides clearance for the stub end transition; the stub end supplies the sealing surface.
Dimension reference: LFP ASME B16.5 lap joint tables. Supplier reference data, not a substitute for the governing standard.
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