Bellows part names

Part names of welded bellows and formed bellows (flexible tubes) in cross-sectional shape are shown.

Welded bellows

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Name	Description
Inner diameter	Nominal inner diameter of bellows
Outer diameter	Nominal outer diameter of bellows
Plate thickness	Thickness of bellows material
Number of plies	Number of plies of material that forms bellows
Span	Length in a radial direction of bellows: (outer diameter-inner diameter)/2
Effective diameter	Diameter used for surface pressure calculation: (outer diameter + inner diameter)/2
Pitch	Interval between threads
Bellows length	Product length excluding parts for fitting connection (end fittings, etc.)
End fitting	Y-shape or corrugated-shape fitting for fitting connection
End pipe length	Straight length of the end pipe portion for fitting connection
Overall length	Bellows length + fitting for fitting connection × 2
Cutting diameter	Dimensions for welding on the outer diameter side of formed bellows
Pipe end diameter	Dimensions for welding on the inner diameter side of formed bellows
Bead (diameter)	Molten bead of welded bellows (its diameter)