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. 296-9917
Mfr. Part No.MCLC-20-20-F
BrandRuland
£28.49
Each
Units
20mm Rigid Coupling 42mm 65mm - - - - - - - - - -
RS Stock No. 837-1050
Mfr. Part No.L050
BrandSKF
£8.44
Each
Units
6mm Straight Jaw Coupling 27.5mm 16mm Set Screw - - - - - - - - -
RS Stock No. 748-364
Mfr. Part No.207.27.3232
BrandHuco
£18.63
Each
Units
10mm - - - - 1.7Nm - - 0.2mm - - - -
RS Stock No. 814-506
Mfr. Part No.PCMR25-8-8-A
BrandRuland
£29.33
Each
Units
- Beam Coupling 25.4mm 31.8mm - 3.73Nm 1.57°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 808-7367
Mfr. Part No.ROTEX42-Complete-KTR
BrandKTR
£126.93
Each
Units
42 → 55mm Curved Jaw Coupling 95mm 126mm - - - - 0.9° 0.32mm -1.00 mm, +2.00 mm - - -
RS Stock No. 701-9137
Mfr. Part No.MJC41-14-A
BrandRuland
£20.06
Each
Units
14mm Curved Jaw Coupling 41.3mm 53mm Clamp - - - - - - - - -
RS Stock No. 692-8115
Mfr. Part No.236.41
BrandHuco
£15.08
1 Bag of 5
Bag(s)
- Oldham (Torque disc) - - - 17Nm 1200Nm/rad - 0.5° 0.25mm 0.15mm - - -
RS Stock No. 701-9149
Mfr. Part No.MJC41-20-A
BrandRuland
£20.06
Each
Units
20mm Curved Jaw Coupling 41.3mm 53mm Clamp - - - - - - - - -
RS Stock No. 489-3761
Mfr. Part No.13005523
BrandLenze
£2.50
Each
Units
- Straight Jaw Coupling - - - - - - 0.4mm 0.45mm - - -
RS Stock No. 814-483
Mfr. Part No.PCMR19-6-6-A
BrandRuland
£23.76
Each
Units
- Beam Coupling 19.1mm 22.9mm - 1.58Nm 2.9°/Nm - 0.203mm 0.127mm - - -
RS Stock No. 693-2477
Mfr. Part No.530.20.2222
BrandHuco
£11.33
Each
Units
6mm Bellows Coupling 20mm 31mm Set Screw 2.27Nm 315Nm/rad 90 x 10^-8kg/m² 0.06mm 0.35mm Stainless Steel - -
RS Stock No. 837-1085
Mfr. Part No.L090/095NR
BrandSKF
£4.82
Each
Units
- Straight Jaw Coupling 54mm - - - - - 0.38mm - - - -
RS Stock No. 809-0758
Mfr. Part No.047.20.3232.RS
BrandHuco
£13.13
Each
Units
10mm Double Loop Elastomer - 48mm - 1.8Nm - - 15° - 7.5mm - - -
RS Stock No. 296-9894
Mfr. Part No.MCLX-15-15-F
BrandRuland
£20.58
Each
Units
15mm Rigid Coupling 34mm 50mm - - - - - - - - - -
RS Stock No. 693-0786
Mfr. Part No.452H25.28
BrandHuco
£7.60
Each
Units
8mm Oldham (Sliding disc) 25.4mm - - - - - - - - - - -
RS Stock No. 701-9146
Mfr. Part No.MJC41-16-A
BrandRuland
£20.06
Each
Units
16mm Curved Jaw Coupling 41.3mm 53mm Clamp - - - - - - - - -
RS Stock No. 477-9817
Mfr. Part No.FCMR25-8-8-A
BrandRuland
£34.34
Each
Units
- Beam Coupling 25.4mm 38.1mm - 3.73Nm 0.862°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 477-9895
Mfr. Part No.PCMR25-8-6-A
BrandRuland
£29.44
Each
Units
- Beam Coupling 25.4mm 31.8mm - 3.73Nm 1.57°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 306-2708
Mfr. Part No.632505
£30.63
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 423-1775
Mfr. Part No.MJC33-12-A
BrandRuland
£17.53
Each
Units
12mm Curved Jaw Coupling 33.3mm 44.5mm Clamp - - - - - - - - -
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