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. 692-8103
Mfr. Part No.236.25
BrandHuco
€19.77
1 Bag of 10
Bag(s)
- Oldham (Torque disc) - - - 4Nm 205Nm/rad - 0.5° 0.2mm 0.1mm - - -
RS Stock No. 809-0727
Mfr. Part No.047.10.2222.RS
BrandHuco
€15.33
Each
units
6mm Double Loop Elastomer - 27mm - 0.5Nm - - 10° - 4.5mm - - -
RS Stock No. 809-0777
Mfr. Part No.047.40.3232.RS
BrandHuco
€20.64
Each
units
10mm Double Loop Elastomer - 56mm - 10Nm - - 15° - 11mm - - -
RS Stock No. 692-8077
Mfr. Part No.450H25.32
BrandHuco
€29.97
1 Bag of 4
Bag(s)
10mm Oldham (Sliding disc) 25.4mm - - - - - - - - - - -
RS Stock No. 692-8128
Mfr. Part No.236.50
BrandHuco
€44.90
1 Bag of 5
Bag(s)
- Oldham (Torque disc) - - - 30Nm 1375Nm/rad - 0.5° 0.25mm 0.2mm - - -
RS Stock No. 692-8099
Mfr. Part No.850.25.28
BrandHuco
€57.41
1 Bag of 4
Bag(s)
8mm Oldham (Sliding disc) 25.4mm - - - - - - - - - - -
RS Stock No. 748-241
Mfr. Part No.321.12.2224
BrandHuco
€87.64
Each
units
1/4in Bellows Coupling 12mm 23mm Set Screw 79Ncm 27Nm/rad 18.5 x 10^-8kg/m² 14° +1.6 → -2.2mm 1.72mm Electrodeposited Nickel - -
RS Stock No. 693-0859
Mfr. Part No.852.19.20
BrandHuco
€12.18
Each
units
5mm Oldham (Sliding disc) 19mm - - - - - - - - - - -
RS Stock No. 748-235
Mfr. Part No.321.12.2222
BrandHuco
€89.15
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 - -
RS Stock No. 693-0809
Mfr. Part No.452H41.35
BrandHuco
€15.58
Each
units
12mm Oldham (Sliding disc) 41.3mm - - - - - - - - - - -
RS Stock No. 693-0803
Mfr. Part No.452H41.36
BrandHuco
€15.58
Each
units
12.7mm Oldham (Sliding disc) 41.3mm - - - - - - - - - - -
RS Stock No. 692-8115
Mfr. Part No.236.41
BrandHuco
€19.59
1 Bag of 5
Bag(s)
- Oldham (Torque disc) - - - 17Nm 1200Nm/rad - 0.5° 0.25mm 0.15mm - - -
RS Stock No. 693-0884
Mfr. Part No.852.41.32
BrandHuco
€28.02
Each
units
10mm Oldham (Sliding disc) 41.3mm - - - - - - - - - - -
RS Stock No. 748-415
Mfr. Part No.205.41.3535
BrandHuco
€30.24
Each
units
12mm - - - - 3.5Nm - - 0.25mm - - - -
RS Stock No. 692-8109
Mfr. Part No.236.19
BrandHuco
€10.22
1 Bag of 10
Bag(s)
- Oldham (Torque disc) - - - 1.7Nm 115Nm/rad - 0.5° 0.2mm 0.1mm - - -
RS Stock No. 693-2470
Mfr. Part No.550.16.2222
BrandHuco
€24.88
Each
units
6mm Bellows Coupling 16mm 21mm Set Screw 0.5Nm 510Nm/rad 17 x 10^-8kg/m² 0.1mm 0.2mm Stainless Steel - -
RS Stock No. 692-8061
Mfr. Part No.450H19.24
BrandHuco
€24.66
1 Bag of 4
Bag(s)
6.35mm Oldham (Sliding disc) 19.1mm - - - - - - - - - - -
RS Stock No. 693-0796
Mfr. Part No.456H33.32
BrandHuco
€14.46
Each
units
10mm Oldham (Sliding disc) 33.3mm - - - - - - - - - - -
RS Stock No. 693-0806
Mfr. Part No.452H41.32
BrandHuco
€15.60
Each
units
10mm Oldham (Sliding disc) 41.3mm - - - - - - - - - - -
RS Stock No. 693-2458
Mfr. Part No.554.45.4848
BrandHuco
€81.66
Each
units
20mm Bellows Coupling 45mm 63mm Clamping 8Nm 20000Nm/rad 3560 x 10^-8kg/m² 1.5° 0.2mm 0.5mm Stainless Steel - -