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. 808-7213
Mfr. Part No.VIVA-VS150-ELEMENT
BrandRexnord
$546.53
Each
units
- Beam Coupling 150mm - - 250Nm - 1.6mm 6.1mm -
RS Stock No. 808-7109
Mfr. Part No.OMEGA-ES2-ELEMENT
BrandRexnord
$318.55
Each
units
- Beam Coupling 3.5in - - 21Nm - 0.063in 0.188in -
RS Stock No. 692-8049
Mfr. Part No.450H13.18
BrandHuco
$36.51
1 Bag of 4
Bag(s)
4mm Oldham Coupling 12.7mm - - - - - - - -
RS Stock No. 740-6199
Mfr. Part No.OCT12-4-A
BrandRuland
$18.55
Each
units
6.35mm Oldham Coupling 19.05mm - - - - - - - -
RS Stock No. 814-635
Mfr. Part No.PSMR25-10-10-A
BrandRuland
$67.13
Each
units
- Beam Coupling 25.4mm 31.8mm - - - 0.381mm 0.254mm -
RS Stock No. 808-7263
Mfr. Part No.ROTEX14PB-ALIHUB-KTR
BrandKTR
$18.16
Each
units
6 → 16mm Jaw Coupling 30mm 22.5mm - - - - - - -
RS Stock No. 837-1108
Mfr. Part No.L095
BrandSKF
$60.23
Each
units
9mm Jaw Coupling 54mm 25mm - - - - - - -
RS Stock No. 745-0061
Mfr. Part No.E69C08B
BrandOmron
$73.34
Each
units
- - 19mm 23.6mm - 0.8Nm - 0.5mm 0.4mm -
RS Stock No. 394-096
Mfr. Part No.466.41.4242
BrandHuco
$129.38
Each
units
16mm Specialist Coupling 41.5mm 48.5mm - - - - - - -
RS Stock No. 449-0479
Mfr. Part No.MSPX-25-25-F
BrandRuland
$146.96
Each
units
25mm Shaft Coupling 45mm 75mm - - - - - - -
RS Stock No. 748-285
Mfr. Part No.321.17.3232
BrandHuco
$234.83
Each
units
10mm Bellows Coupling 17mm 27mm - 132Ncm - 18° +3 → -4mm 1.78mm -
RS Stock No. 837-1054
Mfr. Part No.L070
BrandSKF
$25.46
Each
units
9mm Jaw Coupling 35mm 19mm - - - - - - -
RS Stock No. 808-7276
Mfr. Part No.ROTEX19PB-ALIUB-KTR
BrandKTR
$17.63
Each
units
19 → 24mm Jaw Coupling 41mm 66mm - - - - - - -
RS Stock No. 701-9137
Mfr. Part No.MJC41-14-A
BrandRuland
$47.62
Each
units
14mm Jaw Coupling 41.3mm 53mm - - - - - - -
RS Stock No. 221-932
Mfr. Part No.466.33.3232
BrandHuco
$100.51
Each
units
10mm Specialist Coupling 33.5mm 40.1mm - - - - - - -
RS Stock No. 808-7298
Mfr. Part No.ROTEX24PB-STHUB-KTR
BrandKTR
$36.96
Each
units
22 → 28mm Jaw Coupling 56mm 46mm - - - - - - -
RS Stock No. 477-9801
Mfr. Part No.FCMR25-6-6-A
BrandRuland
$74.53
Each
units
- Beam Coupling 25.4mm 38.1mm - 3.95Nm - 0.381mm 0.254mm -
RS Stock No. 701-9146
Mfr. Part No.MJC41-16-A
BrandRuland
$50.59
Each
units
16mm Jaw Coupling 41.3mm 53mm - - - - - - -
RS Stock No. 693-2436
Mfr. Part No.536.34.3232
BrandHuco
$105.97
Each
units
10mm Bellows Coupling 34mm 40mm - 2.43Nm - 2.5° 0.1mm 0.6mm -
RS Stock No. 183-192
BrandRS PRO
$29.97
Each
units
28mm Jaw Coupling - 29mm - - - - - - -