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Metal Bellows Expansion Joints

Metal Bellows Expansion Joints

Metal bellows expansion joints are designed to compensate for thermal movement of piping systems and take up far less space than piping bends and expansion loops require.

Custom-engineered single- and dual-bellows designs are made from 18-8 stainless steel alloy 321 as well as special alloys including Monel, Inconel, and Hastelloy. Options for metal expansion joints include PTFE-lined, universally-tied, in-line pressure-balanced, externally-pressurized, Gimbal, and hinged, among other configurations.

With a wide range of metals, Kadant Unaflex metal bellows expansion joints can be designed to operate up to 300 psi and with temperatures up to 1,500°F in sizes from 2” up to 144”.


  • Produced from fully-annealed stainless-steel sheet, rolled and seam welded
  • Standard fittings include weld ends, fixed and floating plate flanges, and raised face slip-on flanges
  • Two-ply and multi-ply bellows available in various materials
  • Available PTFE-lining


  • Standard configurations for quick-ship availability
  • Simple retrofit into existing piping system
  • Application-specific joints
  • Cost-effective solution to compensate for movement in piping systems

Custom Solutions

Have an application that requires a specialized solution? We focus on making the best solution possible with quick turnaround. We are ready to engineer your custom-designed expansion joint to fit your application. Our goal is to outperform each and every time, and we do this by working closely with our customers to develop reliable products that exceed your expectations.

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Complete Solutions

From products and services to training and support, we can design, manufacture, install, and maintain your fluid handling systems. Partnering with us ensures your operations are fully integrated for maximum performance.