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. 693-0806
Mfr. Part No.452H41.32
BrandHuco
MYR80.04
Each
units
10mm Oldham (Sliding disc) 41.3mm - - - - - - - - - - -
RS Stock No. 809-0723
Mfr. Part No.047.10.1818.RS
BrandHuco
MYR79.47
Each
units
4mm Double Loop Elastomer - 27mm - 0.5Nm - - 10° - 4.5mm - - -
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. 477-9851
Mfr. Part No.FCMR38-16-16-A
BrandRuland
MYR438.37
Each
units
- Beam Coupling 38.1mm 57.15mm - 10.73Nm 0.392°/Nm - 0.762mm 0.381mm - - -
RS Stock No. 814-629
Mfr. Part No.PSMR25-8-8-A
BrandRuland
MYR148.22
Each
units
- Beam Coupling 25.4mm 31.8mm - 3.73Nm 1.57°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 325-8038
Mfr. Part No.MWC15-5-5-SS
BrandRuland
MYR244.54
Each
units
- Beam Coupling 15mm 20mm - 0.81Nm 5.21°/Nm - 0.2mm 0.12mm - - -
RS Stock No. 808-7096
Mfr. Part No.OMEGA-E30-ELEMENT
BrandRexnord
MYR2,481.05
Each
units
- Tyre Coupling 8.25in - - 412Nm - - 0.031in 0.188in - - -
RS Stock No. 748-285
Mfr. Part No.321.17.3232
BrandHuco
MYR492.72
Each
units
10mm Bellows Coupling 17mm 27mm Set Screw 132Ncm 103Nm/rad 36.2 x 10^-8kg/m² 18° +3 → -4mm 1.78mm Electrodeposited Nickel - -
RS Stock No. 693-2477
Mfr. Part No.530.20.2222
BrandHuco
MYR125.06
Each
units
6mm Bellows Coupling 20mm 31mm Set Screw 2.27Nm 315Nm/rad 90 x 10^-8kg/m² 0.06mm 0.35mm Stainless Steel - -
RS Stock No. 809-0758
Mfr. Part No.047.20.3232.RS
BrandHuco
MYR88.50
Each
units
10mm Double Loop Elastomer - 48mm - 1.8Nm - - 15° - 7.5mm - - -
RS Stock No. 364-3155
Mfr. Part No.PCR16-10MM-3/8”-A
BrandRuland
MYR195.64
Each
units
10mm Beam Coupling 25.4mm 31.8mm - - 1.8°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 693-0803
Mfr. Part No.452H41.36
BrandHuco
MYR80.04
Each
units
12.7mm Oldham (Sliding disc) 41.3mm - - - - - - - - - - -
RS Stock No. 325-8280
Mfr. Part No.MWS30-12-12-SS
BrandRuland
MYR437.99
Each
units
- Beam Coupling 30mm 30mm - 6.6Nm 0.93°/Nm - 0.38mm 0.25mm - - -
RS Stock No. 394-103
Mfr. Part No.470.41.4242
BrandHuco
MYR400.02
Each
units
16mm Disc (Membrane) 41.5mm 60.1mm - - - 2370 x 10^-8kg/m² - - - Aluminium - -
RS Stock No. 296-9800
Mfr. Part No.MCLX-6-6-F
BrandRuland
MYR89.64
Each
units
6mm Rigid Coupling 18mm 30mm - - - - - - - - - -
RS Stock No. 808-7156
Mfr. Part No.OMEGA-E30-HUB-PB
BrandRexnord
MYR1,435.32
Each
units
50 → 75mm Tyre Coupling 8.25in 5.44in - 412Nm - - - - - - - -
RS Stock No. 808-7367
Mfr. Part No.ROTEX42-Complete-KTR
BrandKTR
MYR855.55
Each
units
42 → 55mm Curved Jaw Coupling 95mm 126mm - - - - 0.9° 0.32mm -1.00 mm, +2.00 mm - - -
RS Stock No. 693-2411
Mfr. Part No.536.26.2828
BrandHuco
MYR256.14
Each
units
8mm Bellows Coupling 26mm 37.5mm Clamping 2.43Nm 755Nm/rad 330 x 10^-8kg/m² 0.06mm 0.36mm Stainless Steel - -
RS Stock No. 808-7288
Mfr. Part No.ROTEX19-Complete-KTR
BrandKTR
MYR176.53
Each
units
19 → 24mm Curved Jaw Coupling 41mm 66mm - - - - 1.1° 0.2mm -0.5 mm, +1.2 mm - - -
RS Stock No. 477-9902
Mfr. Part No.MCLX-6-6-SS
BrandRuland
MYR231.46
Each
units
6mm Rigid Coupling 18mm 30mm - - - - - - - - - -