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. 184-735
BrandRS PRO
£13.90
Each
Units
28mm HRC Coupling - 29mm - - - - - - - - - -
RS Stock No. 607-6750
Mfr. Part No.KUP-0610-B
BrandSick
£29.64
Each
Units
6mm - 21mm 29mm - - 120Nm/rad - 0.3mm 0.4mm - - -
RS Stock No. 296-9800
Mfr. Part No.MCLX-6-6-F
BrandRuland
£13.30
Each
Units
6mm Rigid Coupling 18mm 30mm - - - - - - - - - -
RS Stock No. 814-607
Mfr. Part No.PSMR19-6-6-A
BrandRuland
£18.41
Each
Units
- Beam Coupling 19.1mm 22.9mm - 1.58Nm 2.9°/Nm - 0.203mm 0.127mm - - -
RS Stock No. 808-7096
Mfr. Part No.OMEGA-E30-ELEMENT
BrandRexnord
£368.09
Each
Units
- Tyre Coupling 8.25in - - 412Nm - - 0.031in 0.188in - - -
RS Stock No. 808-7266
Mfr. Part No.ROTEX14-Complete-KTR
BrandKTR
£19.10
Each
Units
6 → 16mm Curved Jaw Coupling 30mm 35mm - - - - 1.2° 0.17mm -0.5 mm, +1.0 mm - - -
RS Stock No. 492-9270
Mfr. Part No.KUP-1010-B
BrandSick
£29.64
Each
Units
10mm - 21mm 29mm - - 120Nm/rad - 0.3mm 0.4mm - - -
RS Stock No. 808-7288
Mfr. Part No.ROTEX19-Complete-KTR
BrandKTR
£26.19
Each
Units
19 → 24mm Curved Jaw Coupling 41mm 66mm - - - - 1.1° 0.2mm -0.5 mm, +1.2 mm - - -
RS Stock No. 814-562
Mfr. Part No.PSMR13-4-4-A
BrandRuland
£17.26
Each
Units
4mm Beam Coupling 12.7mm 19.1mm - - 6.66°/Nm - 0.203mm 0.127mm - - -
RS Stock No. 477-9873
Mfr. Part No.PCMR25-10-6-A
BrandRuland
£29.44
Each
Units
- Beam Coupling 25.4mm 31.8mm - - - - 0.381mm 0.254mm - - -
RS Stock No. 423-1703
Mfr. Part No.MJC19-8-A
BrandRuland
£11.25
Each
Units
8mm Curved Jaw Coupling 19.1mm 27.2mm Clamp - - - - - - - - -
RS Stock No. 808-7301
Mfr. Part No.ROTEX24-Complete-KTR
BrandKTR
£28.25
Each
Units
22 → 28mm Curved Jaw Coupling 56mm 78mm - - - - 0.8° 0.22mm -0.5 mm, +1.4 mm - - -
RS Stock No. 750-6732
Mfr. Part No.E69-C06B
BrandOmron
£16.06
Each
Units
6mm - 15mm 22mm - 0.8Nm 7Nm/rad - 0.5mm ±0.4mm - - -
RS Stock No. 808-7099
Mfr. Part No.OMEGA-E10-ELEMENT
BrandRexnord
£244.84
Each
Units
- Tyre Coupling 6.38in - - 164Nm - - 0.063in 0.188in - - -
RS Stock No. 296-9838
Mfr. Part No.MCLX-10-10-F
BrandRuland
£17.12
Each
Units
10mm Rigid Coupling 29mm 45mm - - - - - - - - - -
RS Stock No. 489-3799
Mfr. Part No.13007045
BrandLenze
£6.66
Each
Units
- Straight Jaw Coupling - - - - - - 0.4mm 0.45mm - - -
RS Stock No. 692-8103
Mfr. Part No.236.25
BrandHuco
£15.20
1 Bag of 10
Bag(s)
- Oldham (Torque disc) - - - 4Nm 205Nm/rad - 0.5° 0.2mm 0.1mm - - -
RS Stock No. 296-9822
Mfr. Part No.MCLX-8-8-F
BrandRuland
£14.53
Each
Units
8mm Rigid Coupling 24mm 35mm - - - - - - - - - -
RS Stock No. 808-7276
Mfr. Part No.ROTEX19PB-ALIUB-KTR
BrandKTR
£8.65
Each
Units
19 24mm Curved Jaw Coupling 41mm 66mm - - - - - - - - - -
RS Stock No. 808-7323
Mfr. Part No.ROTEX28-Complete-KTR
BrandKTR
£40.00
Each
Units
28 → 38mm Curved Jaw Coupling 66mm 90mm - - - - 0.8° 0.25mm -0.7 mm, +1.5 mm - - -
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