Couplings

Couplings are used to join two shafts together for the purpose of transmitting power.


Couplings can be either material flexing or mechanical flexing.


Typical uses for couplings are motor to pump, motor to gear box and motor to electric actuator.


Factors to consider unless you are replacing a like for like coupling are:


  • Horsepower of the motor

  • RPM

  • BSE (the distance between shaft ends

  • Operating temperature

  • Space available

  • Run cycle

  • Angular, parallel or axial misalignment handling

There are many different types of couplings available and many factors should be considered before deciding on a specific type.


Some of the types of couplings available:


General purpose, backlash free, flexible beam couplings feature multiple helical cuts and are machined from one piece material. They have 0.4 to 12 Nm nominal torque range and reduces wind-up compared to single beam coupling. Flexible beam couplings are used in a variety of motion-control applications, from aviation and lab equipment to robotics and medical devices. A common industrial application arises when a motor is connected to a pump. Factory automation equipment and other machine tools rely on flexible beam couplings to transmit power from a motor source.


Bellows couplings are made of a thin-walled, flexible metal corrugation (bellows) that is connected between two clamping hubs. They are designed to create a low inertia zero-backlash coupling which will last a long time without maintenance. Bellows couplings can accommodate all forms of misalignment and have a balanced design for reduced vibration at high speeds. They’re best suited for applications where precise positioning is required, such as in material handling or general automation and assembly.


Jaw couplings are used within electrical motor and internal combustion systems to transmit power (torque). They are designed to connect two shafts, enabling smooth torque transmission and reducing loss of power. Jaw couplings work by preventing shock loading (the sudden and drastic increase of load in a system) and/or accommodating shaft misalignment where this has been caused by thermal expansion or manufacturing inefficiencies.


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Description Price Bore Coupling Types Outside Diameter Length Fastening Type Torque Rating Torsional Stiffness Moment of Inertia Misalignment - Angular Misalignment - Parallel Misalignment - Axial Bellows Material Priced to Clear Shore Hardness
RS Stock No. 174-7282
Mfr. Part No.MBC25-10-8-A
BrandRuland
£76.76
Each
Units
10mm Bellows Coupling 25.4mm 33.3mm Clamping 6.8Nm 27°/Nm - 1.5° 0.1mm 0.3mm Stainless Steel - -
RS Stock No. 186-4131
Mfr. Part No.PCMR32-12-12-A
BrandRuland
£63.50
Each
Units
12mm - 31.8mm 38.1mm Clamping - 1.10°/Nm 9.948 x 10^-6kg/m² 0.38mm 0.25mm Aluminium - -
RS Stock No. 171-6684
Mfr. Part No.703.16.2020
BrandHuco
£36.44
Each
Units
5mm MultiBeam 6 Beam 15.9 25.4mm - 5Nm 45Nm/rad - 0.2 - Stainless Steel - -
RS Stock No. 186-4098
Mfr. Part No.FCMR16-6-6-A
BrandRuland
£39.56
Each
Units
6mm - 15.9mm 25.4mm Clamping - 3.21°/Nm 0.380 x 10^-6kg/m² 0.2mm 0.13mm Aluminium - -
RS Stock No. 174-7247
Mfr. Part No.MJCC41-16-A
BrandRuland
£35.37
Each
Units
16mm Curved Jaw Coupling 41.3mm 53mm Clamp - - - - - - - - -
RS Stock No. 186-4130
Mfr. Part No.PCMR32-10-10-A
BrandRuland
£63.50
Each
Units
10mm - 31.8mm 38.1mm Clamping - 0.62°/Nm 9.948 x 10^-6kg/m² 0.38mm 0.25mm Aluminium - -
RS Stock No. 186-4097
Mfr. Part No.FCMR16-6-5-A
BrandRuland
£40.32
Each
Units
5 (B2) mm, 6 (B1) mm - 15.9mm 25.4mm Clamping - 3.21°/Nm 0.380 x 10^-6kg/m² 0.2mm 0.13mm Aluminium - -
RS Stock No. 146-2842
Mfr. Part No.WE40HMMPB
BrandTB Woods
£178.02
Each
Units
- Flexible Elastomer 247mm 207mm - 622Nm 7370Nm/rad - 2.4mm - - - -
RS Stock No. 186-4129
Mfr. Part No.PCMR16-5-5-A
BrandRuland
£33.00
Each
Units
5mm - 15.9mm 20.3mm Clamping - 4.78°/Nm 0.322 x 10^-6kg/m² 0.2mm 0.13mm Aluminium - -
RS Stock No. 186-4096
Mfr. Part No.FCMR16-5-5-A
BrandRuland
£40.12
Each
Units
5mm - 15.9mm 25.4mm Clamping - 3.21°/Nm 0.380 x 10^-6kg/m² 0.2mm 0.13mm Aluminium - -
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