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 Moment of Inertia Misalignment - Angular Misalignment - Parallel Misalignment - Axial Bellows Material Shore Hardness Suitable For Use With
RS stock no. 814-607
Mfr. Part No.PSMR19-6-6-A
BrandRuland
R 342.33
Each
units
- Beam Coupling 19.1mm 22.9mm - 1.58Nm 2.9°/Nm - 0.203mm 0.127mm - - -
RS stock no. 693-2477
Mfr. Part No.530.20.2222
BrandHuco
R 216.22
Each
units
8mm Bellows Coupling 20mm 31mm Set Screw 2.27Nm 315Nm/rad 90 x 10^-8kg/m² 0.06mm 0.35mm Stainless Steel - -
RS stock no. 809-0727
Mfr. Part No.047.10.2222.RS
BrandHuco
R 225.18
Each
units
6mm Double Loop Elastomer - 27mm - 0.5Nm - - 10° - 4.5mm - - -
RS stock no. 808-7266
Mfr. Part No.ROTEX14-Complete-KTR
BrandKTR
R 311.39
Each
units
6 → 16mm Curved Jaw Coupling 30mm 35mm - - - - 1.2° 0.17mm -0.5 mm, +1.0 mm - - -
RS stock no. 837-1063
Mfr. Part No.L075
BrandSKF
R 207.53
Each
units
9mm Straight Jaw Coupling 44.5mm 21mm Set Screw - - - - - - - - -
RS stock no. 296-9917
Mfr. Part No.MCLC-20-20-F
BrandRuland
R 632.05
Each
units
20mm Rigid Coupling 42mm 65mm - - - - - - - - - -
RS stock no. 808-7204
Mfr. Part No.VIVA-VS130-ELEMENT
BrandRexnord
R 3,869.05
Each
units
- Tyre Coupling 129mm - - 164Nm - - 1.6mm 5.5mm - - -
RS stock no. 814-635
Mfr. Part No.PSMR25-10-10-A
BrandRuland
R 412.01
Each
units
- Beam Coupling 25.4mm 31.8mm - - 1.8°/Nm - 0.381mm 0.254mm - - -
RS stock no. 837-1054
Mfr. Part No.L070
BrandSKF
R 181.78
Each
units
9mm Straight Jaw Coupling 35mm 19mm Set Screw - - - - - - - - -
RS stock no. 808-7288
Mfr. Part No.ROTEX19-Complete-KTR
BrandKTR
R 458.17
Each
units
19 → 24mm Curved Jaw Coupling 41mm 66mm - - - - 1.1° 0.2mm -0.5 mm, +1.2 mm - - -
RS stock no. 808-7276
Mfr. Part No.ROTEX19PB-ALIUB-KTR
BrandKTR
R 168.89
Each
units
19 → 24mm Curved Jaw Coupling 41mm 66mm - - - - - - - - - -
RS stock no. 410-6512
Mfr. Part No.RS1761026
BrandHengstler
R 172.32
Each
units
- - 15mm 20mm - 70Ncm 12Nm/rad - ±2.5° ±0.3mm ±0.2mm - - -
RS stock no. 492-9270
Mfr. Part No.KUP-1010-B
BrandSick
R 751.11
Each
units
10mm - 21mm 29mm - - 120Nm/rad - 0.3mm 0.4mm - - -
RS stock no. 814-584
Mfr. Part No.PSMR19-4-4-A
BrandRuland
R 342.33
Each
units
- Beam Coupling 19.1mm 22.9mm - 1.92Nm 2.27°/Nm - 0.203mm 0.127mm - - -
RS stock no. 808-7200
Mfr. Part No.VIVA-VS125-ELEMENT
BrandRexnord
R 3,536.17
Each
units
- Tyre Coupling 120mm - - 105Nm - - 1.6mm 4.9mm - - -
RS stock no. 607-6750
Mfr. Part No.KUP-0610-B
BrandSick
R 564.83
Each
units
6mm - 21mm 29mm - - 120Nm/rad - 0.3mm 0.4mm - - -
RS stock no. 296-9800
Mfr. Part No.MCLX-6-6-F
BrandRuland
R 255.19
Each
units
6mm Rigid Coupling 18mm 30mm - - - - - - - - - -
RS stock no. 689-9685
Mfr. Part No.FSMR38-12-12-SS
BrandRuland
R 2,586.60
Each
units
- Beam Coupling 38.1mm 57.15mm - 12.43Nm 0.235°/Nm - 0.762mm 0.381mm - - -
RS stock no. 808-7301
Mfr. Part No.ROTEX24-Complete-KTR
BrandKTR
R 559.21
Each
units
22 → 28mm Curved Jaw Coupling 56mm 78mm - - - - 0.8° 0.22mm -0.5 mm, +1.4 mm - - -
RS stock no. 423-1680
Mfr. Part No.MJC19-5-A
BrandRuland
R 213.82
Each
units
5mm Curved Jaw Coupling 19.1mm 27.2mm Clamp - - - - - - - - -