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. 808-7266
Mfr. Part No.ROTEX14-Complete-KTR
BrandKTR
R 428.54
Each
units
6 → 16mm Jaw Coupling 30mm 35mm - - - 1.2° 0.17mm -0.5 mm, +1.0mm -
RS stock no. 808-7288
Mfr. Part No.ROTEX19-Complete-KTR
BrandKTR
R 603.42
Each
units
19 → 24mm Jaw Coupling 41mm 66mm - - - 1.1° 0.2mm -0.5 mm, +1.2mm -
RS stock no. 808-7276
Mfr. Part No.ROTEX19PB-ALIUB-KTR
BrandKTR
R 203.85
Each
units
19 → 24mm Jaw Coupling 41mm 66mm - - - - - - -
RS stock no. 808-7301
Mfr. Part No.ROTEX24-Complete-KTR
BrandKTR
R 687.85
Each
units
22 → 28mm Jaw Coupling 56mm 78mm - - - 0.8° 0.22mm -0.5 mm, +1.4mm -
RS stock no. 808-7282
Mfr. Part No.ROTEX24-92SHEL-KTR
BrandKTR
R 119.41
Each
units
- Jaw Coupling - - - - - 0.9° 0.22mm -0.5 mm, +1.4mm -
RS stock no. 808-7263
Mfr. Part No.ROTEX14PB-ALIHUB-KTR
BrandKTR
R 178.86
Each
units
6 → 16mm Jaw Coupling 30mm 22.5mm - - - - - - -
RS stock no. 869-1689
Mfr. Part No.BOWEXM19-HUB-PB
BrandKTR
R 265.82
Each
units
19mm Gear Coupling 32mm - - 48Nm - 0.7° 0.2mm - -
RS stock no. 808-7285
Mfr. Part No.ROTEX19PB-STHUB-KTR
BrandKTR
R 287.68
Each
units
19 → 24mm Jaw Coupling 41mm 39mm - - - - - - -
RS stock no. 808-7339
Mfr. Part No.ROTEX38-64SHEL-KTR
BrandKTR
R 434.12
Each
units
- Jaw Coupling - - - - - 0.5° 0.14mm -0.7 mm, +1.8mm -
RS stock no. 808-7327
Mfr. Part No.ROTEX38-92SHEL-KTR
BrandKTR
R 266.10
Each
units
- Jaw Coupling - - - - - 0.28mm -0.7 mm, +1.8mm -
RS stock no. 808-7305
Mfr. Part No.ROTEX28-92SHEL-KTR
BrandKTR
R 207.84
Each
units
- Jaw Coupling - - - - - 0.9° 0.25mm -0.7 mm, +1.5mm -
RS stock no. 808-7298
Mfr. Part No.ROTEX24PB-STHUB-KTR
BrandKTR
R 472.49
Each
units
22 → 28mm Jaw Coupling 56mm 46mm - - - - - - -
RS stock no. 808-7294
Mfr. Part No.ROTEX24-64SHEL-KTR
BrandKTR
R 189.14
Each
units
- Jaw Coupling - - - - - 0.45° 0.11mm -0.5 mm, +1.4mm -
RS stock no. 869-1720
Mfr. Part No.BOWEXM32-COMPLETE
BrandKTR
R 1,209.31
Each
units
- Gear Coupling 50mm - - 180Nm - 0.6° 0.23mm - -
RS stock no. 869-1752
Mfr. Part No.BOWEXM65-HUB-PB
BrandKTR
R 1,973.47
Each
units
65mm Gear Coupling 96mm - - 1140Nm - 0.5° 0.28mm - -
RS stock no. 869-1698
Mfr. Part No.BOWEXM19-SLEEVE-PB
BrandKTR
R 108.81
Each
units
- Gear Coupling 47mm 37mm - - - - - - -
RS stock no. 203-2394
Mfr. Part No.ROTEXGS7-PB-ALIHUB
BrandKTR
R 283.88
Each
units
7mm Jaw Coupling 14mm 5mm - - - - - - -
RS stock no. 203-2395
Mfr. Part No.ROTEXGS7-COMPLETE
BrandKTR
R 608.82
Each
units
7mm Jaw Coupling 14mm 15mm - 2Nm - 0.9° 0.06mm +0.6 → -0.3mm -
RS stock no. 869-1746
Mfr. Part No.BOWEXM48-HUB-PB
BrandKTR
R 789.97
Each
units
48mm Gear Coupling 68mm - - 420Nm - 0.6° 0.25mm - -
RS stock no. 203-2391
Mfr. Part No.ROTEXGS7-92SHEL
BrandKTR
R 43.82
Each
units
- Jaw Coupling 14mm - - 1.2Nm - 0.1mm +0.6 → -0.3mm -