Metal Expansion joints | Expansion Joints | Bellows Systems

Bellows Systems can manufacture custom Metal Expansion Joints in many different configurations to suit your application

Bellows Systems offers different types of Expansion Joints designs including simple single bellows element Expansion Joints to pressure balanced Expansion Joints for your piping or ducting needs. We utilize our standard metal bellows elements to rapidly assemble custom Metal Expansion Joints that meet your exact project requirements. Our OEM and custom Expansion Joints are used in a wide range of industries, from Oil and Gas, Aerospace, Power Gen, Petrochemical, Water and Wastewater.


Bellows Systems offers various end fitting options for our expansion joints including, pipe weld ends, Fixed flange, Floating flange, Marman Flange, Slotted Cuff Ends. 


Bellows Systems additionally offers flow liners, control rods, external covers, thermal insulation as required for your application. 

Material Selection for Expansion Joints

Bellows Systems manufactures using a wide range of materials for our metal expansion joints. The selection and use of various metals and alloys is based on the application, its physical properties and other properties like its resistance to corrosion and cyclic fatigue.

The most common material for our metal bellows and expansion joints are the various grades of austenitic stainless steels. In addition, we have provided metal expansion joints in Inconel, Hastelloy, Monel, Other high Nickel alloys, Cobalt alloys, Titanium, Aluminum, brass and other copper alloys, and many other specialty metal alloys.

The material choices available allow us to design  bellows for a wide range of service conditions, for temperatures from -330˚F (cryogenic) to 1800˚F and for pressure rating from full vacuum to 3,000 Psi.

Chemical Compatibility Chart

Stainless Steel Expansion Joints

Why stainless steel expansion joints?

Austenitic Stainless Steels are the most commonly used materials for metal bellows and expansion joints. Stainless steel expansion joints provide a good combination of strength, corrosion resistance and cost effectiveness. The standard grades of stainless steels used in expansion joints are SS304/ 304L, SS316/316L and SS321. We stock a wide range of stainless steel in sheet thickness ranging from 0.005” to 0.141” (10 Ga).

How to select the right stainless steel grades for expansion joints?

The stainless steel material selection is based on the service conditions. For example, in high temperature applications SS321 is preferred due to its  superior high temperature corrosion properties. SS316 is the preferred grade for applications from cryogenic temperatures to 800F service.

For more information on stainless steel grades and their properties consult our materials page.


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