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 Shore Hardness Suitable For Use With
RS Stock No. 183-798
BrandRS PRO
£5.27
Each
Units
32mm HRC Coupling - 29mm - - - - - - - - - -
RS Stock No. 810-0694
BrandRS PRO
£8.79
Each
Units
8 → 19mm Gear coupling 32mm - - 16Nm - - 1mm - - - -
RS Stock No. 183-805
BrandRS PRO
£8.80
Each
Units
45mm HRC Coupling - 38mm - - - - - - - - - -
RS Stock No. 183-186
BrandRS PRO
£9.11
Each
Units
25mm HRC Coupling - 29mm - - - - - - - - - -
RS Stock No. 183-192
BrandRS PRO
£14.32
Each
Units
28mm HRC Coupling - 29mm - - - - - - - - - -
RS Stock No. 183-209
BrandRS PRO
£16.28
Each
Units
42mm HRC Coupling - 38mm - - - - - - - - - -
RS Stock No. 183-811
BrandRS PRO
£10.82
Each
Units
50mm HRC Coupling - 38mm - - - - - - - - - -
RS Stock No. 183-782
BrandRS PRO
£3.32
Each
Units
31mm HRC Coupling - 29mm - - - - - - - - - -
RS Stock No. 810-0707
BrandRS PRO
£16.03
Each
Units
10 → 28mm Gear coupling 44mm - - 45Nm - - 1mm - - - -
RS Stock No. 810-0726
BrandRS PRO
£6.41
Each
Units
- Gear coupling 66mm 46mm - - - - - 1mm - - - -
RS Stock No. 184-779
BrandRS PRO
£16.28
Each
Units
42mm HRC Coupling - 38mm - - - - - - - - - -
RS Stock No. 184-785
BrandRS PRO
£9.11
Each
Units
25mm HRC Coupling - 29mm - - - - - - - - - -
RS Stock No. 810-0717
BrandRS PRO
£4.77
Each
Units
- Gear coupling 52mm 41mm - - - - - 1mm - - - -
RS Stock No. 810-0704
BrandRS PRO
£11.75
Each
Units
10 → 24mm Gear coupling 36mm - - 20Nm - - 1mm - - - -
RS Stock No. 810-0690
BrandRS PRO
£7.40
Each
Units
6 → 14mm Gear coupling 25mm - - 10Nm - - 1mm - - - -
RS Stock No. 184-684
BrandRS PRO
£20.86
Each
Units
42mm HRC Coupling - 38mm - - - - - - - - - -
RS Stock No. 184-763
BrandRS PRO
£20.86
Each
Units
42mm HRC Coupling - 38mm - - - - - - - - - -
RS Stock No. 810-0710
BrandRS PRO
£3.03
Each
Units
- Gear coupling 40mm 37mm - - - - - 1mm - - - -
RS Stock No. 810-0713
BrandRS PRO
£4.17
Each
Units
- Gear coupling 48mm 37mm - - - - - 1mm - - - -
RS Stock No. 810-0729
BrandRS PRO
£9.35
Each
Units
- Gear coupling 76mm 48mm - - - - - 1mm - - - -
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