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. 489-3828
Mfr. Part No.13005538
BrandLenze
MYR53.70
Each
units
- Straight Jaw Coupling - - - - - - 0.5° 0.4mm 0.4mm - - -
RS Stock No. 693-0809
Mfr. Part No.452H41.35
BrandHuco
MYR80.88
Each
units
12mm Oldham (Sliding disc) 41.3mm - - - - - - - - - - -
RS Stock No. 750-6732
Mfr. Part No.E69-C06B
BrandOmron
MYR107.62
Each
units
6mm - 15mm 22mm - 0.8Nm 7Nm/rad - 0.5mm ±0.4mm - - -
RS Stock No. 837-1085
Mfr. Part No.L090/095NR
BrandSKF
MYR27.11
Each
units
- Straight Jaw Coupling 54mm - - - - - 0.38mm - - - -
RS Stock No. 394-096
Mfr. Part No.466.41.4242
BrandHuco
MYR400.02
Each
units
16mm Disc (Membrane) 41.5mm 48.5mm - - - 2220 x 10^-8kg/m² - - - Aluminium - -
RS Stock No. 692-8115
Mfr. Part No.236.41
BrandHuco
MYR100.59
1 Bag of 5
Bag(s)
- Oldham (Torque disc) - - - 17Nm 1200Nm/rad - 0.5° 0.25mm 0.15mm - - -
RS Stock No. 808-7327
Mfr. Part No.ROTEX38-92SHEL-KTR
BrandKTR
MYR79.26
Each
units
- Curved Jaw Coupling - - - - - - 0.28mm -0.7 mm, +1.8 mm - - -
RS Stock No. 296-9894
Mfr. Part No.MCLX-15-15-F
BrandRuland
MYR137.27
Each
units
15mm Rigid Coupling 34mm 50mm - - - - - - - - - -
RS Stock No. 477-9823
Mfr. Part No.FCMR38-12-12-A
BrandRuland
MYR438.37
Each
units
12mm Beam Coupling 38.1mm 57.15mm - 12.43Nm 0.235°/Nm - 0.762mm 0.381mm - - -
RS Stock No. 808-7282
Mfr. Part No.ROTEX24-92SHEL-KTR
BrandKTR
MYR35.79
Each
units
- Curved Jaw Coupling - - - - - - 0.9° 0.22mm -0.5 mm, +1.4 mm - - -
RS Stock No. 814-657
Mfr. Part No.FSMR32-12-12-A
BrandRuland
MYR253.20
Each
units
- Beam Coupling 31.75mm 44.45mm - 5.65Nm 0.627°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 808-7254
Mfr. Part No.ROTEX14-98SHEL-KTR
BrandKTR
MYR21.41
Each
units
- Curved Jaw Coupling - - - - - - 1.2° 0.17mm -0.5 mm, +1 mm - - -
RS Stock No. 229-504
Mfr. Part No.470.26.2222
BrandHuco
MYR285.69
Each
units
6mm Disc (Membrane) 25.6mm 36.1mm - - - 210 x 10^-8kg/m² - - - Aluminium - -
RS Stock No. 221-932
Mfr. Part No.466.33.3232
BrandHuco
MYR310.70
Each
units
10mm Disc (Membrane) 33.5mm 40.1mm - - - 730 x 10^-8kg/m² - - - Aluminium - -
RS Stock No. 477-9873
Mfr. Part No.PCMR25-10-6-A
BrandRuland
MYR196.37
Each
units
- Beam Coupling 25.4mm 31.8mm - - - - 0.381mm 0.254mm - - -
RS Stock No. 693-0806
Mfr. Part No.452H41.32
BrandHuco
MYR80.04
Each
units
10mm Oldham (Sliding disc) 41.3mm - - - - - - - - - - -
RS Stock No. 183-209
BrandRS PRO
MYR105.46
Each
units
42mm HRC Coupling - 38mm - - - - - - - - - -
RS Stock No. 689-9691
Mfr. Part No.FCMR38-12-12-SS
BrandRuland
MYR875.68
Each
units
- Beam Coupling 38.1mm 57.15mm - 12.43Nm 0.235°/Nm - 0.762mm 0.381mm - - -
RS Stock No. 814-483
Mfr. Part No.PCMR19-6-6-A
BrandRuland
MYR158.49
Each
units
- Beam Coupling 19.1mm 22.9mm - 1.58Nm 2.9°/Nm - 0.203mm 0.127mm - - -
RS Stock No. 837-1076
Mfr. Part No.L075NR
BrandSKF
MYR17.89
Each
units
- Straight Jaw Coupling 44.5mm - - - - - 0.38mm - - - -