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Bellows part names

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

Welded bellows

溶接ベローズ

Formed bellows (flexible tubes)

成形ベローズ(フレキ)
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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)

Glossary of bellows terms

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