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

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Flexible Beam Couplings

Three series of zero backlash flexible beam couplings are available with inch and metric bores and outside diameters ranging from 3/8" (9.5mm) to 1-1/2" (38mm). Couplings in all three series are machined from a single piece of aluminum or stainless steel and feature multiple spiral cuts. The multiple cut design provides higher torque capabilities and greatly reduced wind-up compared to commodity-type single beam couplings.

The four beam (P and MW Series) and six beam (F Series) each have two sets of spiral slots, a feature that provides superior parallel misalignment capabilities compared to single beam couplings. Angular misalignment, axial motion and any combination of all three types of misalignment are also easily accommodated by flexible beam couplings. Ruland clamp style flexible beam couplings have the additional benefit of dynamic balancing, due to the unique configuration of the socket head cap screws.

Flexible beam couplings should be used in applications in which misalignment exists between the two shafts being coupled. F series couplings are ideal for light duty power transmission applications such as coupling a servo motor to a lead screw in a motion control system. The couplings feature larger body sizes and stronger beams to provide high torque capacity and very low wind-up, without sacrificing misalignment capabilities. The demanding nature of reversing servo applications make the performance benefits delivered by the F series vital to maintaining the accuracy, repeatability and reliability of the system.

The P and MW series couplings are designed specifically for precision applications, especially those that use delicate components such as encoders and tachometers. The small bearings on these components make low radial forces essential to longevity and continued high performance. The P and MW series couplings provide extra flexibility to yield reduced bearing loads, and shorter industry standard lengths to fit in confined spaces and allow for easy retrofits in existing equipment. At the same time, the multiple cut pattern continues to provide excellent torque capabilities and low wind-up.


• Zero-backlash
• Torsionally rigid with dampening

Product Specifications (Click a row for detailed specifications)

Product Range
F-Series: FCR (Clamp) and FSR (Set Screw) 
Six Beam Flexible Coupling - Aluminum and Stainless Steel - Inch
F-Series: FCMR (Clamp) and FSMR (Set Screw)
Six Beam Flexible Coupling - Aluminum and Stainless Steel - Metric
P-Series: PCR (Clamp) and PSR (Set Screw) Series
Four Beam Flexible Coupling - Aluminum and Stainless Steel - Inch
P-Series: PCMR (Clamp) and PSMR (Set Screw) Series
Four Beam Flexible Coupling - Aluminum and Stainless Steel - Metric
MW-Series: MWC (Clamp) and MWS (Set Screw)
Four Beam Flexible Coupling - Aluminum and Stainless Steel - Metric
Flexible Beam 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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