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
€23.27
Each
units
6 → 16mm Jaw Coupling 30mm 35mm - - - 1.2° 0.17mm -0.5 mm, +1.0mm -
RS Stock No. 808-7364
Mfr. Part No.ROTEX42PB-ALIHUB-KTR
BrandKTR
€71.96
Each
units
42 → 55mm Jaw Coupling 95mm 73mm - - - 0.9° 0.23mm -1.00 mm, +2.00mm -
RS Stock No. 808-7301
Mfr. Part No.ROTEX24-Complete-KTR
BrandKTR
€34.43
Each
units
22 → 28mm Jaw Coupling 56mm 78mm - - - 0.8° 0.22mm -0.5 mm, +1.4mm -
RS Stock No. 808-7367
Mfr. Part No.ROTEX42-Complete-KTR
BrandKTR
€169.96
Each
units
42 → 55mm Jaw Coupling 95mm 126mm - - - 0.9° 0.32mm -1.00 mm, +2.00mm -
RS Stock No. 808-7285
Mfr. Part No.ROTEX19PB-STHUB-KTR
BrandKTR
€14.60
Each
units
19 → 24mm Jaw Coupling 41mm 39mm - - - - - - -
RS Stock No. 808-7276
Mfr. Part No.ROTEX19PB-ALIUB-KTR
BrandKTR
€11.59
Each
units
19 → 24mm Jaw Coupling 41mm 66mm - - - - - - -
RS Stock No. 869-1736
Mfr. Part No.BOWEXM38-COMPLETE
BrandKTR
€95.61
Each
units
38mm Gear Coupling 58mm - - 240Nm - 0.6° 0.25mm - -
RS Stock No. 869-1695
Mfr. Part No.BOWEXM24-HUB-PB
BrandKTR
€17.63
Each
units
24mm Gear Coupling 36mm - - 60Nm - 0.6° 0.23mm - -
RS Stock No. 869-1705
Mfr. Part No.BOWEXM24-SLEEVE-PB
BrandKTR
€7.39
Each
units
- Gear Coupling 53mm 41mm - - - - - - -
RS Stock No. 808-7308
Mfr. Part No.ROTEX24PB-ALIHUB-KTR
BrandKTR
€15.40
Each
units
22 → 28mm Jaw Coupling 56mm 46mm - - - - - - -
RS Stock No. 808-7263
Mfr. Part No.ROTEX14PB-ALIHUB-KTR
BrandKTR
€10.64
Each
units
6 → 16mm Jaw Coupling 30mm 22.5mm - - - - - - -
RS Stock No. 869-1682
Mfr. Part No.BOWEXM14-SLEEVE-PB
BrandKTR
€5.72
Each
units
- Gear Coupling 40mm 37mm - - - - - - -
RS Stock No. 808-7358
Mfr. Part No.ROTEX42-98SHEL-KTR
BrandKTR
€23.24
Each
units
- Jaw Coupling - - - - - 0.32mm -1 mm, +2mm -
RS Stock No. 808-7355
Mfr. Part No.ROTEX42PB-CIHUB-KTR
BrandKTR
€84.72
Each
units
42 → 55mm Jaw Coupling 95mm 73mm - - - - - - -
RS Stock No. 808-7282
Mfr. Part No.ROTEX24-92SHEL-KTR
BrandKTR
€7.11
Each
units
- Jaw Coupling - - - - - 0.9° 0.22mm -0.5 mm, +1.4mm -
RS Stock No. 869-1691
Mfr. Part No.BOWEXM19-COMPLETE
BrandKTR
€35.80
Each
units
- Gear Coupling 32mm - - 48Nm - 0.7° 0.2mm - -
RS Stock No. 808-7349
Mfr. Part No.ROTEX42-92SHEL-KTR
BrandKTR
€21.15
Each
units
- Jaw Coupling - - - - - 0.32mm -1 mm, +2mm -
RS Stock No. 869-1742
Mfr. Part No.BOWEXM42-COMPLETE
BrandKTR
€112.01
Each
units
- Gear Coupling 65mm - - 300Nm - 0.6° 0.25mm - -
RS Stock No. 808-7320
Mfr. Part No.ROTEX28PB-STHUB-KTR
BrandKTR
€28.83
Each
units
28 → 38mm Jaw Coupling 66mm 52.5mm - - - - - - -
RS Stock No. 869-1714
Mfr. Part No.BOWEXM28-COMPLETE
BrandKTR
€63.46
Each
units
28mm Gear Coupling 44mm - - 135Nm - 0.6° 0.23mm - -