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. 808-7106
Mfr. Part No.OMEGA-E40-ELEMENT
BrandRexnord
£324.01
Each
Units
- Tyre Coupling 9.5in - - 621Nm - - 0.031in 0.188in - - -
RS Stock No. 814-534
Mfr. Part No.FCMR32-12-12-A
BrandRuland
£46.82
Each
Units
12mm Beam Coupling 31.75mm 44.45mm Clamp - - - - - - - - -
RS Stock No. 489-3705
Mfr. Part No.13024168
BrandLenze
£11.29
Each
Units
1/4in Straight Jaw Coupling 27.4mm 43mm Jaw - - - 0.12mm +1.4mm - - -
RS Stock No. 423-2166
Mfr. Part No.JD16/25-98R
BrandRuland
£4.275
Each (In a Pack of 2)
Units
- Curved Jaw Coupling 25.4mm - - - - - 0.8° 0.08mm 0.76mm - 98Shore A 25 mm Hubs
RS Stock No. 809-0727
Mfr. Part No.047.10.2222.RS
BrandHuco
£11.79
Each
Units
6mm Double Loop Elastomer - 27mm - 0.5Nm - - 10° - 4.5mm - - -
RS Stock No. 837-1063
Mfr. Part No.L075
BrandSKF
£11.26
Each
Units
9mm Straight Jaw Coupling 44.5mm 21mm Set Screw - - - - - - - - -
RS Stock No. 477-9801
Mfr. Part No.FCMR25-6-6-A
BrandRuland
£34.34
Each
Units
- Beam Coupling 25.4mm 38.1mm - 3.95Nm 0.548°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 296-9872
Mfr. Part No.MCLX-14-14-F
BrandRuland
£20.58
Each
Units
14mm Rigid Coupling 34mm 50mm - - - - - - - - - -
RS Stock No. 814-512
Mfr. Part No.PCMR25-10-10-A
BrandRuland
£29.33
Each
Units
- Beam Coupling 25.4mm 31.8mm - - 1.57°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 489-3727
Mfr. Part No.13024170
BrandLenze
£17.25
Each
Units
1/2in Straight Jaw Coupling 45mm 54mm - - - - 0.12mm +1.4mm - - -
RS Stock No. 423-1747
Mfr. Part No.MJC25-10-A
BrandRuland
£13.80
Each
Units
10mm Curved Jaw Coupling 25.4mm 11.9mm Clamp - - - - - - - - -
RS Stock No. 449-0378
Mfr. Part No.MCLX-25-25-F
BrandRuland
£29.54
Each
Units
25mm Rigid Coupling 45mm 75mm - - - - - - - - - -
RS Stock No. 489-3834
Mfr. Part No.13005531
BrandLenze
£10.01
Each
Units
- Straight Jaw Coupling - - - - - - 0.5° 0.4mm 0.4mm - - -
RS Stock No. 808-7092
Mfr. Part No.OMEGA-E20-ELEMENT
BrandRexnord
£295.30
Each
Units
- Tyre Coupling 7.25in - - 260Nm - - 0.031in 0.188in - - -
RS Stock No. 296-9939
Mfr. Part No.MCLC-25-25-F
BrandRuland
£30.47
Each
Units
25mm Rigid Coupling 45mm 75mm - - - - - - - - - -
RS Stock No. 692-8109
Mfr. Part No.236.19
BrandHuco
£7.86
1 Bag of 10
Bag(s)
- Oldham (Torque disc) - - - 1.7Nm 115Nm/rad - 0.5° 0.2mm 0.1mm - - -
RS Stock No. 814-635
Mfr. Part No.PSMR25-10-10-A
BrandRuland
£21.99
Each
Units
- Beam Coupling 25.4mm 31.8mm - - 1.8°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 808-7314
Mfr. Part No.ROTEX28-98SHEL-KTR
BrandKTR
£6.81
Each
Units
- Curved Jaw Coupling - - - - - - 0.9° 0.25mm -0.7 mm, +1.5 mm - - -
RS Stock No. 410-6512
Mfr. Part No.RS1761026
BrandHengstler
£10.23
Each
Units
- - 15mm 20mm - 70Ncm 12Nm/rad - ±2.5° ±0.3mm ±0.2mm - - -
RS Stock No. 435-1150
Mfr. Part No.MCLX-5-5-A
BrandRuland
£23.44
Each
Units
5mm Rigid Coupling 15mm 22mm - - - - - - - - - -
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