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. 808-7096
Mfr. Part No.OMEGA-E30-ELEMENT
BrandRexnord
$900.36
Each
units
- Tyre Coupling 8.25in - - 412Nm - - 0.031in 0.188in - - -
RS Stock No. 814-607
Mfr. Part No.PSMR19-6-6-A
BrandRuland
$58.29
Each
units
- Beam Coupling 19.1mm 22.9mm - 1.58Nm 2.9°/Nm - 0.203mm 0.127mm - - -
RS Stock No. 750-6732
Mfr. Part No.E69-C06B
BrandOmron
$56.55
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
$539.00
Each
units
- Tyre Coupling 6.38in - - 164Nm - - 0.063in 0.188in - - -
RS Stock No. 306-2708
Mfr. Part No.632505
BrandPaulstra
$50.25
Each
units
- - - - - - - - - - - - - -
RS Stock No. 607-6750
Mfr. Part No.KUP-0610-B
BrandSick
$56.10
Each
units
6mm - 21mm 29mm - - 120Nm/rad - 0.3mm 0.4mm - - -
RS Stock No. 477-9867
Mfr. Part No.PCMR19-6-5-A
BrandRuland
$53.58
Each
units
- Beam Coupling 19.1mm 22.9mm - 1.58Nm 2.9°/Nm - 0.203mm 0.127mm - - -
RS Stock No. 296-9800
Mfr. Part No.MCLX-6-6-F
BrandRuland
$36.18
Each
units
6mm Rigid Coupling 18mm 30mm - - - - - - - - - -
RS Stock No. 489-3755
Mfr. Part No.13007059
BrandLenze
$2.80
Each
units
- Straight Jaw Coupling - - - - - - 0.4mm 0.45mm - - -
RS Stock No. 837-1050
Mfr. Part No.L050
BrandSKF
$19.44
Each
units
6mm Straight Jaw Coupling 27.5mm 16mm Set Screw - - - - - - - - -
RS Stock No. 808-7314
Mfr. Part No.ROTEX28-98SHEL-KTR
BrandKTR
$12.87
Each
units
- Curved Jaw Coupling - - - - - - 0.9° 0.25mm -0.7 mm, +1.5 mm - - -
RS Stock No. 745-0070
Mfr. Part No.E69-C10B
BrandOmron
$74.38
Each
units
- - 22mm 26.2mm - 0.8Nm 7Nm/rad - 0.5mm ±0.4mm - - -
RS Stock No. 808-7288
Mfr. Part No.ROTEX19-Complete-KTR
BrandKTR
$48.23
Each
units
19 → 24mm Curved Jaw Coupling 41mm 66mm - - - - 1.1° 0.2mm -0.5 mm, +1.2 mm - - -
RS Stock No. 745-0077
Mfr. Part No.E69-C68B
BrandOmron
$81.78
Each
units
- - 19mm 24.8mm - 0.8Nm 7Nm/rad - 0.5mm ±0.4mm - - -
RS Stock No. 837-1066
Mfr. Part No.L090
BrandSKF
$26.74
Each
units
9mm Straight Jaw Coupling 54mm 21mm Set Screw - - - - - - - - -
RS Stock No. 837-1057
Mfr. Part No.L035
BrandSKF
$11.38
Each
units
3mm Straight Jaw Coupling 72mm 17mm - - - - - - - - - -
RS Stock No. 808-7193
Mfr. Part No.VIVA-V170-ELEMENT
BrandRexnord
$441.64
Each
units
- Tyre Coupling 168mm - - 308Nm - - 1.6mm 6.6mm - - -
RS Stock No. 296-9822
Mfr. Part No.MCLX-8-8-F
BrandRuland
$41.17
Each
units
8mm Rigid Coupling 24mm 35mm - - - - - - - - - -
RS Stock No. 489-3727
Mfr. Part No.13024170
BrandLenze
$28.14
Each
units
1/2in Straight Jaw Coupling 45mm 54mm - - - - 0.12mm +1.4mm - - -
RS Stock No. 809-0727
Mfr. Part No.047.10.2222.RS
BrandHuco
$34.85
Each
units
6mm Double Loop Elastomer - 27mm - 0.5Nm - - 10° - 4.5mm - - -
Related Products
Designed to perform where higher speeds, greater misalignment, ...
Description:
Designed to perform where higher speeds, greater misalignment, and limited lubrication would exceed the capabilities of other couplings. Each coupling is manufactured as one piece, thereby eliminating mechanical joints and possible failure points.Two fixing styles available:,Typical applications include encoders, ...
Designed to perform where higher speeds, greater misalignment, ...
Description:
Designed to perform where higher speeds, greater misalignment, and limited lubrication would exceed the capabilities of other couplings. Each coupling is manufactured as one piece, thereby eliminating mechanical joints and possible failure points.Two fixing styles available:,Typical applications include encoders, ...