Shaft Collars

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2012 Shaft Collar Stock List

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Shaft Couplings

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Product Tables

Shaft Collars
Shaft Couplings
Flexible Beam


Fastening Hardware
Stick Slip
Torque Charts (Metal)
Torque Charts (Plastic)
Wrench Sizes
REACH Compliance
RoHS Compliance


Avoiding Coupling Failure
Getting a Hold on Shaft Collars
Rigid Collars for Motion Control
Shaft Couplings

Useful Tools:

Ruland Website
CAD Drawings

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Bellows Couplings

Bellows couplings are an assembly of two aluminum hubs and a uniform, thin walled stainless steel bellows.

The use of aluminum hubs with a bellows results in a coupling with very low inertia, a feature that is very important in today’s highly responsive systems.

The characteristics of bellows make them an ideal method for transmitting torque in motion control applications. The bellows allow the coupling to bend easily under loads caused by the three basic types of misalignment between shafts (angular, parallel, axial motion). Because they have uniform, thin walls, the bellows provide low bearing loads that remain constant at all points of rotation, without the damaging cyclical high and low loading points found in some other types of couplings. All of this is accomplished while remaining rigid under torsional loads.

Torsional rigidity is a key factor in determining the accuracy of the coupling. The stiffer the coupling, the more accurately motion is translated from the motor to the driven component. Among servo couplings, bellows type couplings are one of the stiffest available, making them ideal in high performance applications that require a high degree of accuracy and repeatability. 


• High torque
• Balanced for high RPM
• Low Inertia
• No maintenance
• High torsional stiffness
• Constant velocity
• Long life
• Zero backlash

Product Specifications (Click a row for detailed specifications)

Product Range
BC (Clamp) and BS (Set Screw) Series
Stainless Steel Bellows Coupling - Inch
MBC (Clamp) and MBS (Set Screw) Series
Stainless Steel Bellows Coupling - Metric
Bellow Couplings
Technical Information and Part Nomenclature

For additional information on shaft couplings, please see the following technical article entitled
"What to Look For in Shaft Couplings" made available on the RotoPrecision website courtesy of Ruland.

For additional technical product and ordering information,
please contact Application Support.


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