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 Misalignment - Angular Misalignment - Parallel Misalignment - Axial Bellows Material
RS Stock No. 296-9822
Mfr. Part No.MCLX-8-8-F
BrandRuland
$41.25
Each
units
8mm Shaft Coupling 24mm 35mm - - - - - - -
RS Stock No. 814-556
Mfr. Part No.PSMR13-3-3-A
BrandRuland
$39.65
Each
units
- Beam Coupling 12.7mm 19.1mm - 0.92Nm - 0.203mm 0.127mm -
RS Stock No. 809-0727
Mfr. Part No.047.10.2222.RS
BrandHuco
$38.94
Each
units
6mm Specialist Coupling - 27mm - 0.5Nm - 10° - 4.5mm -
RS Stock No. 869-1711
Mfr. Part No.BOWEXM28-SLEEVE-PB
BrandKTR
$26.01
Each
units
- Gear Coupling 65mm 46mm - - - - - - -
RS Stock No. 808-7266
Mfr. Part No.ROTEX14-Complete-KTR
BrandKTR
$44.92
Each
units
6 → 16mm Jaw Coupling 30mm 35mm - - - 1.2° 0.17mm -0.5 mm, +1.0mm -
RS Stock No. 477-9918
Mfr. Part No.MCLX-8-8-SS
BrandRuland
$86.71
Each
units
8mm Shaft Coupling 24mm 35mm - - - - - - -
RS Stock No. 808-7301
Mfr. Part No.ROTEX24-Complete-KTR
BrandKTR
$65.92
Each
units
22 → 28mm Jaw Coupling 56mm 78mm - - - 0.8° 0.22mm -0.5 mm, +1.4mm -
RS Stock No. 808-7147
Mfr. Part No.OMEGA-E20-HUB-PB
BrandRexnord
$292.76
Each
units
- Beam Coupling 7.25in 4.25in - 260Nm - - - - -
RS Stock No. 810-0694
BrandRS PRO
$19.89
Each
units
8 → 19mm Gear Coupling 32mm - - 16Nm - 1mm - -
RS Stock No. 845-386
Mfr. Part No.114826
BrandBaumer
$269.65
Each
units
10mm Beam Coupling 25mm 29.5mm - 1Nm - 0.25mm 0.4mm -
RS Stock No. 814-629
Mfr. Part No.PSMR25-8-8-A
BrandRuland
$65.38
Each
units
- Beam Coupling 25.4mm 31.8mm - 3.73Nm - 0.381mm 0.254mm -
RS Stock No. 837-1063
Mfr. Part No.L075
BrandSKF
$29.97
Each
units
9mm Jaw Coupling 44.5mm 21mm - - - - - - -
RS Stock No. 183-805
BrandRS PRO
$20.48
Each
units
45mm Jaw Coupling - 38mm - - - - - - -
RS Stock No. 296-9945
Mfr. Part No.MCLC-30-30-F
BrandRuland
$125.38
Each
units
30mm Shaft Coupling 53mm 83mm - - - - - - -
RS Stock No. 809-0767
Mfr. Part No.047.30.3535.RS
BrandHuco
$41.47
Each
units
12mm Specialist Coupling - 56mm - 5Nm - 15° - 8.5mm -
RS Stock No. 296-9939
Mfr. Part No.MCLC-25-25-F
BrandRuland
$118.16
Each
units
25mm Shaft Coupling 45mm 75mm - - - - - - -
RS Stock No. 477-9895
Mfr. Part No.PCMR25-8-6-A
BrandRuland
$102.32
Each
units
- Beam Coupling 25.4mm 31.8mm - 3.73Nm - 0.381mm 0.254mm -
RS Stock No. 814-477
Mfr. Part No.PCMR19-5-5-A
BrandRuland
$51.58
Each
units
- Beam Coupling 19.1mm 22.9mm - 1.92Nm - 0.203mm 0.127mm -
RS Stock No. 808-7323
Mfr. Part No.ROTEX28-Complete-KTR
BrandKTR
$94.08
Each
units
28 → 38mm Jaw Coupling 66mm 90mm - - - 0.8° 0.25mm -0.7 mm, +1.5mm -
RS Stock No. 489-3799
Mfr. Part No.13007045
BrandLenze
$15.70
Each
units
- Jaw Coupling - - - - - 0.4mm 0.45mm -