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Bellows Couplings

Bellows couplings are a type of flexible couplings with two clamping hubs connected by a series of flexible stainless steel or bronze bellows (corrugations).  The corrugations absorb axial forces that are created by thermal expansion as the motor heats up, meaning bellows couplings can handle higher operating temperatures than elastomer couplings.
The bellows are lightweight and have thin walls, allowing for flexibility in conditions involving minor angular, axial, or parallel misalignment while maintaining a rigid torsional connection between shafts or other joined components. This unique combination of torsional rigidity and flexibility allows for the precise angular positioning and high-speed transmission of velocity and torque. 

Selecting the Right Bellows Coupling for Your Motion Control Application

It is crucial to determine the peak torque capacity of your servo motor and the shaft size before selecting a coupling. Using a bellows coupler in applications that exceed its peak torque rating will cause coupling failure and potential equipment damage. 
Need help selecting the right bellows coupling for your application? Ondrives.US engineers have developed a White Paper “How to select Shaft Couplings” to assist you in the selection 

Backlash-Free Bellows Couplings for Motion Control Applications

Bellows offset couplings provide high performance in applications involving perpendicular displacement. These offset bellow couplings allow a superior combination of angular, radial and axial misalignment not found in many other couplings. As true backlash free couplings, they are ideal for any motion control application. Common uses for stainless steel or bronze bellows couplings include:  
  • Servo drives
  • Stepper motors
  • Pulse generators
  • Positioning slides
  • Metering valves
  • Velocity control systems
  • Scanners

Bellows Couplings Handle Three Types of Misalignment

Ondrives.US Bellows couplings comprise two end hubs with set screws or an integral clamp to fasten to a shaft. The flex member of the coupling is hydroformed from tubing to make deep flexible corrugations, with the center bellow coupling unit mechanically fastened to the hubs.
Our bellows couplings have a low moment of inertia and minimal restoring forces under misalignment. They have excellent kinematic properties and very high torsional stiffness.
We offer Short, Long and Stretched version bellows couplings for various combinations of stiffness, radial compensation, and axial motion. Features include:
  • Set screw or clamp fastening
  • Bore sizes up to 20mm 
  • Peak torque up to 111 in-lbs.
For more demanding applications, our Heavy Duty Bellows couplings have peak torques up to 3098 in-lbs. and bore size up to 100mm.

Customization Options and Complementary Products for Our Bellows Couplings

Ondrives.US offers customization on all our flexible stainless-steel or bronze bellows couplings to meet your motion control requirements. Please contact our application engineers to discuss your specifications. We also offer complementary products to attach and position your bellows couplings:
  • Bore Reducers let you couple to almost any shaft diameter. Offered in brass, aluminum, and stainless steel.
  • Attach your bellows shaft coupling to a Precision Ground Shaft, available from stock.

The Ondrives.US Advantage: We have bellows couplings for every application

Ondrives.US is a bellows coupling manufacturer offering standard couplings along with modified or custom options to meet the demands of any application. Features and benefits of our stainless-steel bellows couplings include:
  • Zero Backlash
  • Up to 8 degrees of angular offset
  • Any bore to bore combination available within the min. max. limit
  • Inch and metric bellows coupling bores
  • Torques to 3098 inch-lbs
  • Stainless Steel or Bronze Bellows
  • High torsional stiffness
  • High torque in a compact package
  • Bores up to 3.97”
  • Low inertia
  • RPM up to 52,000
  • Metal bellows couplings feature excellent kinematic properties
  • Temperature up to +302°F
  • Aluminum or Steel hubs
  • Clamp or Set Screw Fastening

Get Bellows Couplings in the Size and Torque Rating You Need. Request a Quote Today!

Bellows couplings offer the torsional stiffness and flexibility required for high speed, high precision motion control applications. Select an in-stock option that meets your torque rating requirements or contact us to discuss modified or customized stainless steel bellows couplings.
We also offer other Zero-Backlash couplings that may meet your needs. Check out our Metal Servo-Beam™Polymer Servo-Beam™, and Polymer Step-Beam™ couplings.