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. 489-3828
Mfr. Part No.13005538
BrandLenze
SGD16.69
Each
units
- Jaw Coupling - - - - - 0.5° 0.4mm 0.4mm -
RS Stock No. 814-607
Mfr. Part No.PSMR19-6-6-A
BrandRuland
SGD40.59
Each
units
- Beam Coupling 19.1mm 22.9mm - 1.58Nm - 0.203mm 0.127mm -
RS Stock No. 693-0780
Mfr. Part No.452H25.31
BrandHuco
SGD15.76
Each
units
9.525mm Oldham Coupling 25.4mm - - - - - - - -
RS Stock No. 693-0799
Mfr. Part No.456H33.28
BrandHuco
SGD23.08
Each
units
8mm Oldham Coupling 33.3mm - - - - - - - -
RS Stock No. 296-9800
Mfr. Part No.MCLX-6-6-F
BrandRuland
SGD27.58
Each
units
6mm Shaft Coupling 18mm 30mm - - - - - - -
RS Stock No. 869-1689
Mfr. Part No.BOWEXM19-HUB-PB
BrandKTR
SGD22.67
Each
units
19mm Gear Coupling 32mm - - 48Nm - 0.7° 0.2mm - -
RS Stock No. 869-1691
Mfr. Part No.BOWEXM19-COMPLETE
BrandKTR
SGD55.43
Each
units
- Gear Coupling 32mm - - 48Nm - 0.7° 0.2mm - -
RS Stock No. 435-1150
Mfr. Part No.MCLX-5-5-A
BrandRuland
SGD48.87
Each
units
5mm Shaft Coupling 15mm 22mm - - - - - - -
RS Stock No. 808-7314
Mfr. Part No.ROTEX28-98SHEL-KTR
BrandKTR
SGD14.37
Each
units
- Jaw Coupling - - - - - 0.9° 0.25mm -0.7 mm, +1.5mm -
RS Stock No. 489-3840
Mfr. Part No.13005532
BrandLenze
SGD32.79
Each
units
- Jaw Coupling - - - - - 0.5° 0.4mm 0.4mm -
RS Stock No. 306-2708
Mfr. Part No.632505
SGD78.22
Each
units
- - - - - - - - - - -
RS Stock No. 296-9838
Mfr. Part No.MCLX-10-10-F
BrandRuland
SGD35.50
Each
units
10mm Shaft Coupling 29mm 45mm - - - - - - -
RS Stock No. 325-8072
Mfr. Part No.MWC20-5-5-SS
BrandRuland
SGD102.43
Each
units
- Beam Coupling 20mm 20mm - 1.3Nm - 0.2mm 0.12mm -
RS Stock No. 808-7092
Mfr. Part No.OMEGA-E20-ELEMENT
BrandRexnord
SGD612.40
Each
units
- Beam Coupling 7.25in - - 260Nm - 0.031in 0.188in -
RS Stock No. 814-635
Mfr. Part No.PSMR25-10-10-A
BrandRuland
SGD45.60
Each
units
- Beam Coupling 25.4mm 31.8mm - - - 0.381mm 0.254mm -
RS Stock No. 745-8080
Mfr. Part No.MOCT25-6-A
BrandRuland
SGD25.99
Each
units
6mm Oldham Coupling 25.4mm - - - - - - - -
RS Stock No. 325-8280
Mfr. Part No.MWS30-12-12-SS
BrandRuland
SGD134.76
Each
units
- Beam Coupling 30mm 30mm - 6.6Nm - 0.38mm 0.25mm -
RS Stock No. 477-9889
Mfr. Part No.PCMR25-10-8-A
BrandRuland
SGD61.05
Each
units
- Beam Coupling 25.4mm 31.8mm - - - 0.381mm 0.254mm -
RS Stock No. 449-0413
Mfr. Part No.MSPX-12-12-F
BrandRuland
SGD93.05
Each
units
12mm Shaft Coupling 29mm 45mm - - - - - - -
RS Stock No. 814-528
Mfr. Part No.FCMR32-10-10-A
BrandRuland
SGD96.87
Each
units
- Beam Coupling 31.75mm 44.45mm - 6.89Nm - 0.381mm 0.254mm -