Welded bellowsProduct catalogCAD drawing The manufacturing process of bellows(video)

Photo of welded bellows

Welded bellows are metal bellows manufactured by joining thin metal plates on precision disks while alternately welding their inner and outer diameters.

Bellows can be displaced in the axial direction, the axis perpendicular direction, and the angular direction with the pressure inside and outside cut off by welding.


- IRIE KOKEN’s welded bellows are compact and offer superior expansion/contraction, and long lifetime designs are also available.

- Expansion/contraction properties and spring characteristics can be set by changing the inner/outer diameter dimensions and plate thickness.

- Users can weld Y-type end fittings.

- These bellows are highly pressure-resistant.

Technical information

What are bellows?

About bellows materials --- Explanation of AM350 equivalent and other representative materials used for welded bellows

How to use bellows (12) --- Design precautions and handling precautions

Glossary of bellows terms

Standard welded bellows

Our lineup includes discrete bellows and welded bellows with a conflat flange at both ends.

All can be used under the following pressure, temperature, and specific life conditions..

Standard welded bellows selection procedures

Standard product estimate request form

<Standard specifications>

Pressure conditions (Internal) vacuum
(External) atmospheric pressure
Temperature conditions Ordinary temperature (baking temp. max. 250°C)
Operating conditions Axial displacement only
Leak rate 1×10-9 Pa・m3/s or less
Materials (Bellows) SUS316L or AM350 equivalent (discrete bellows only)
(Flange) SUS304L
Specific life conditions (Discrete bellows) 10,000, 100,000, or 1,000,000 repetitions
(with conflat flanges) 10,000 repetitions
* Bellows having 10,000 repetitions spec: SUS316L only
  • Bellows
    • These specifications apply to welded
      bellows only, which can be used:
    • - When fittings are welded by the user, or
    • - When user-supplied fittings are welded by us.
    • Product details
  • Bellows with conflat flanges
    • These welded bellows include a CF
    • flange at both ends.
    • The CF flange type can be selected.
    • Fixation at both ends or fixation-rotation.
    • Product details

Customized products

Even when standard products do not meet your specifications, we will make considerations on an individual basis. Please let us know your detailed specifications, when you have specific needs such as:

We will make recommendations adopting optimum designs for various applications. Please feel free to consult us.

User specification product estimate request form

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