Bellows Couplings
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Bellows Couplings from Ruland



Bellows coupling

Bellows couplings combine stainless steel bellows and black anodized aluminum hubs to offer superior performance in motion control applications. The bellows are made of stainless steel, which makes them ideal for transmitting torque. Due to the bellows' thin walls, the coupling is able to flex easily while remaining rigid under torsional loads. Parallel misalignment, angular misalignment and axial motion are accommodated by the bellows coupling.

The combination of aluminum hubs with the bellows results in an extremely lightweight, low inertia coupling. Zero backlash and a long, maintenance-free life are assured since the bellows coupling has no moving parts. An important feature of the bellows coupling is a balanced design to reduce vibration in high rpm applications of up to 10,000 rpm. Bellows couplings are especially suited for high-end servo, stepper, encoder and positioning applications.

Ruland bellows couplers are offered in six sizes with set screw or clamp style hubs and bores ranging from 1/8" (3mm) to 1" (25mm). Stainless steel hubs, keyways, and other custom features are available by special order.

Learn more about how to choose a servo coupling for your particular application from a Ruland expert. Read "What to Look for in a Servo Coupling" or "Tips to Simplify Servo Coupling Selection" written by William Hewitson, Vice President of Operations.

Why Ruland

  • Flexible Bellows CouplingsUnique balanced clamp screw design reduces vibration while the cross cut increases clamping ability.
  • Ruland uses an epoxy adhesive to join the bellows to the hubs to eliminate the risks involved with welding.
  • Multi-ply stainless steel bellows are used for added strength and long maintenance-free life.
  • The thin walls of the hydro-formed bellows maintain low bearing loads and flexibility while remaining rigid under torsional loads.
  • Accommodates parallel misalignment, angular misalignment and axial motion.


BC Bellows Coupling
BC Clamp Style
Inch Dimensions
BCK Bellows Coupling
BCK Clamp Style
Inch with Keyways
MBC Bellows Coupling
MBC Clamp Style
Metric Dimensions
MBCK Bellows Coupling
MBCK Clamp Style
Metric with Keyways
BS Bellows Coupling
BS Set Screw
Inch Dimensions
BSK Bellows Coupling
BSK Set Screw
Inch with Keyways
MBS Bellows Coupling
MBS Set Screw
Metric Dimensions
MBSK Bellows Coupling
MBSK Set Screw
Metric with Keyways
Inch to Metric Bores
Inch to Metric Bores
Inch to Metric Dimensions

Custom Designs

Custom Bellows CouplingAs a service to our customers, we offer our vast machining experience and talents to meet special needs with custom parts. Our shop is equipped with the machines and skilled people necessary to fill all of your special requirements. If you don't see what you are looking for in our standard line, please inquire about our custom fabrication service.

Examples of Past Specials:

  • Stainless steel bellows couplings
  • Special bore sizes and geometry
  • Special lengths, widths and outside diameters
  • Special material and hardware requests
  • And Many Others... Please Contact Us for More Information

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Clamp Style
Bellows Coupling

Set Screw
Bellows Coupling

Inch to Metric
Bellows Coupling