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. 423-1898
Mfr. Part No.JD12/19-92Y
BrandRuland
MYR26.35
Each (In a Pack of 2)
units
- Curved Jaw Coupling 19.1mm - - - - - 0.9° 0.1mm 0.51mm - 92Shore A 19 mm Hubs
RS Stock No. 174-7173
Mfr. Part No.MBC19-6-6-A
BrandRuland
MYR460.85
Each
units
6mm Bellows Coupling 19.1mm 30.2mm Clamping 4.5Nm 14°/Nm - 1.5° 0.1mm 0.25mm Stainless Steel - -
RS Stock No. 693-2398
Mfr. Part No.554.16.1414
BrandHuco
MYR155.42
Each
units
3mm Bellows Coupling 15.5mm 23mm Clamping 0.43Nm 510Nm/rad 30 x 10^-8kg/m² 0.1mm 0.2mm Stainless Steel - -
RS Stock No. 808-7323
Mfr. Part No.ROTEX28-Complete-KTR
BrandKTR
MYR266.81
Each
units
28 → 38mm Curved Jaw Coupling 66mm 90mm - - - - 0.8° 0.25mm -0.7 mm, +1.5 mm - - -
RS Stock No. 814-635
Mfr. Part No.PSMR25-10-10-A
BrandRuland
MYR90.33
Each
units
- Beam Coupling 25.4mm 31.8mm - - 1.8°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 692-8137
Mfr. Part No.238.13
BrandHuco
MYR58.10
1 Bag of 10
Bag(s)
- Oldham (Torque disc) - - - 0.5Nm 65Nm/rad - 0.5° 0.1mm 0.05mm - - -
New
RS Stock No. 196-7683
Mfr. Part No.592.66.4949
BrandHuco
MYR845.65
Each
units
22mm Bellows Coupling 66mm 79mm Clamp 60Nm 75000Nm/rad 31360 1.5° 0.15mm 0.6mm Stainless Steel - -
RS Stock No. 186-4120
Mfr. Part No.FSMR19-5-5-A
BrandRuland
MYR268.35
Each
units
5mm - 19.1mm 31.8mm Clamping - 1.33°/Nm 1.037 x 10^-6kg/m² 0.2mm 0.13mm Aluminium - -
RS Stock No. 423-2188
Mfr. Part No.JD21/33-92Y
BrandRuland
MYR33.285
Each (In a Pack of 2)
units
- Curved Jaw Coupling 33.3mm - - - - - 0.9° 0.13mm 0.76mm - 92Shore A 33 mm Hubs
RS Stock No. 489-3733
Mfr. Part No.13024240
BrandLenze
MYR168.43
Each
units
3/8in Straight Jaw Coupling 54mm 54mm Jaw - - - 0.12mm +1.4mm - - -
RS Stock No. 364-3127
Mfr. Part No.PCR12-4-4-A
BrandRuland
MYR164.96
Each
units
4mm Beam Coupling 0.75in 0.9in - 19lb/in 0.179°/lb-in - 0.008in 0.005in - - -
RS Stock No. 171-6687
Mfr. Part No.703.25.2828
BrandHuco
MYR335.18
Each
units
- MultiBeam 6 Beam 25.4 38.1mm - 16Nm 170Nm/rad - 0.38 - Stainless Steel - -
RS Stock No. 174-7230
Mfr. Part No.MJC51-25-A
BrandRuland
MYR285.89
Each
units
25mm Curved Jaw Coupling 50.8mm 61mm Clamp - - - - - - - - -
RS Stock No. 171-6694
Mfr. Part No.721.19.2828
BrandHuco
MYR232.90
Each
units
8mm MultiBeam 3 Beam 19.1 22.9mm - 2.7Nm 143Nm/rad - 0.12 - Stainless Steel - -
New
RS Stock No. 196-7710
Mfr. Part No.555.56.4646
BrandHuco
MYR652.60
Each
units
19mm Bellows Coupling 56mm 73mm Clamp 30Nm 28000Nm/rad 14930 0.25mm 1mm Stainless Steel - -
RS Stock No. 701-9146
Mfr. Part No.MJC41-16-A
BrandRuland
MYR133.81
Each
units
16mm Curved Jaw Coupling 41.3mm 53mm Clamp - - - - - - - - -
RS Stock No. 693-2506
Mfr. Part No.530.41.4242
BrandHuco
MYR280.15
Each
units
16mm Bellows Coupling 41mm 49.7mm Set Screw 7.61Nm 2880Nm/rad 2490 x 10^-8kg/m² 2.5° 0.15mm 0.8mm Stainless Steel - -
RS Stock No. 489-3783
Mfr. Part No.13005536
BrandLenze
MYR18.60
Each
units
- Straight Jaw Coupling - - - - - - 0.4mm 0.45mm - - -
RS Stock No. 186-4125
Mfr. Part No.JD10/15-92Y
BrandRuland
MYR42.82
Each
units
- - 15mm - - - 0.42°/Nm - 0.9° 0.1mm 0.51mm - - -
RS Stock No. 693-2518
Mfr. Part No.550.45.4242
BrandHuco
MYR382.27
Each
units
16mm Bellows Coupling 45mm 19.5mm Set Screw 22.3Nm 20000Nm/rad 3560kg/m² 1.5° 0.2mm 0.5mm Stainless Steel - -