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. 809-0727
Mfr. Part No.047.10.2222.RS
BrandHuco
$36.52
Each
units
6mm Double Loop Elastomer - 27mm - 0.5Nm - - 10° - 4.5mm - - -
RS Stock No. 809-0767
Mfr. Part No.047.30.3535.RS
BrandHuco
$42.16
Each
units
12mm Double Loop Elastomer - 56mm - 5Nm - - 15° - 8.5mm - - -
RS Stock No. 394-080
Mfr. Part No.470.33.3232
BrandHuco
$99.71
Each
units
10mm Disc (Membrane) 33.5mm 50.8mm - - - 760 x 10^-8kg/m² - - - Aluminium - -
RS Stock No. 692-8049
Mfr. Part No.450H13.18
BrandHuco
$34.24
1 Bag of 4
Bag(s)
4mm Oldham (Sliding disc) 12.7mm - - - - - - - - - - -
RS Stock No. 748-421
Mfr. Part No.205.41.3636
BrandHuco
$37.37
Each
units
1/2in - - - - 3.5Nm - - 0.25mm - - - -
RS Stock No. 748-392
Mfr. Part No.206.34.3232
BrandHuco
$65.27
Each
units
10mm - - - - 2.5Nm - - 0.25mm - - - -
RS Stock No. 221-932
Mfr. Part No.466.33.3232
BrandHuco
$160.90
Each
units
10mm Disc (Membrane) 33.5mm 40.1mm - - - 730 x 10^-8kg/m² - - - Aluminium - -
RS Stock No. 748-285
Mfr. Part No.321.17.3232
BrandHuco
$220.22
Each
units
10mm Bellows Coupling 17mm 27mm Set Screw 132Ncm 103Nm/rad 36.2 x 10^-8kg/m² 18° +3 → -4mm 1.78mm Electrodeposited Nickel - -
RS Stock No. 394-096
Mfr. Part No.466.41.4242
BrandHuco
$185.59
Each
units
16mm Disc (Membrane) 41.5mm 48.5mm - - - 2220 x 10^-8kg/m² - - - Aluminium - -
RS Stock No. 229-504
Mfr. Part No.470.26.2222
BrandHuco
$91.72
Each
units
6mm Disc (Membrane) 25.6mm 36.1mm - - - 210 x 10^-8kg/m² - - - Aluminium - -
RS Stock No. 229-497
Mfr. Part No.466.26.2424
BrandHuco
$90.29
Each
units
1/4in Disc (Membrane) 25.6mm 28.4mm - - - 160 x 10^-8kg/m² - - - Aluminium - -
RS Stock No. 693-2436
Mfr. Part No.536.34.3232
BrandHuco
$108.17
Each
units
10mm Bellows Coupling 34mm 40mm Clamping 2.43Nm 1740Nm/rad 925 x 10^-8kg/m² 2.5° 0.1mm 0.6mm Stainless Steel - -
RS Stock No. 748-370
Mfr. Part No.207.27.3132
BrandHuco
$39.90
Each
units
10 mm, 3/8 in - - - - 1.7Nm - - 0.2mm - - - -
RS Stock No. 809-0736
Mfr. Part No.047.10.2828.RS
BrandHuco
$32.13
Each
units
8mm Double Loop Elastomer - 27mm - 0.5Nm - - 10° - 4.5mm - - -
RS Stock No. 693-0777
Mfr. Part No.453H19.22
BrandHuco
$11.76
Each
units
6mm Oldham (Sliding disc) 19.1mm - - - - - - - - - - -
RS Stock No. 748-263
Mfr. Part No.321.17.3131
BrandHuco
$195.69
Each
units
9.525mm Bellows Coupling 17mm 27mm Set Screw 132Ncm 103Nm/rad 36.2 x 10^-8kg/m² 18° +3 -4mm 1.78mm Electrodeposited Nickel - -
RS Stock No. 229-447
Mfr. Part No.470.19.1414
BrandHuco
$49.32
Each
units
3 x 3mm Disc (Membrane) 19.2mm 34.5mm - - - 60 x 10^-8kg/m² - - - Aluminium - -
RS Stock No. 692-8109
Mfr. Part No.236.19
BrandHuco
$16.83
1 Bag of 10
Bag(s)
- Oldham (Torque disc) - - - 1.7Nm 115Nm/rad - 0.5° 0.2mm 0.1mm - - -
RS Stock No. 748-336
Mfr. Part No.207.18.2424
BrandHuco
$45.87
Each
units
1/4in - - - - 0.3Nm - - 0.2mm - - - -
RS Stock No. 748-235
Mfr. Part No.321.12.2222
BrandHuco
$150.61
Each
units
6mm Bellows Coupling 12mm 23mm Set Screw 79Ncm 27Nm/rad 18.5 x 10^-8kg/m² 14° +1.6 -2.2mm 1.72mm Electrodeposited Nickel - -