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. 809-0767
Mfr. Part No.047.30.3535.RS
BrandHuco
HK$166.22
Each
units
12mm Double Loop Elastomer - 56mm - 5Nm - - 15° - 8.5mm - - -
RS Stock No. 186-4135
Mfr. Part No.MJS15-6-A
BrandRuland
HK$130.76
Each
units
6mm - 15mm 21.8mm Set Screw - - - - - - Aluminium - -
RS Stock No. 146-2820
Mfr. Part No.WE3M
BrandTB Woods
HK$1,212.55
Each
units
- Flexible Elastomer 108mm 110mm - 41Nm 532Nm/rad - 1.6mm - - - -
RS Stock No. 186-4119
Mfr. Part No.FCMR38-20-20-A
BrandRuland
HK$1,117.57
Each
units
20mm - 38.1mm 57.2mm Clamping - 0.77°/Nm 30.032 x 10^-6kg/m² 0.76mm 0.38mm Aluminium - -
RS Stock No. 435-1144
Mfr. Part No.MCLX-4-4-A
BrandRuland
HK$268.15
Each
units
4mm Rigid Coupling 15mm 22mm - - - - - - - - - -
RS Stock No. 837-1079
Mfr. Part No.L050NR
BrandSKF
HK$23.80
Each
units
- Straight Jaw Coupling 27.5mm - - - - - 0.38mm - - - -
RS Stock No. 748-386
Mfr. Part No.206.34.3131
BrandHuco
HK$230.17
Each
units
3/8in - - - - 2.5Nm - - 0.25mm - - - -
RS Stock No. 489-3705
Mfr. Part No.13024168
BrandLenze
HK$129.16
Each
units
1/4in Straight Jaw Coupling 27.4mm 43mm Jaw - - - 0.12mm +1.4mm - - -
RS Stock No. 693-2499
Mfr. Part No.530.34.3232
BrandHuco
HK$443.76
Each
units
10mm Bellows Coupling 34mm 40mm Set Screw 4.62Nm 1740Nm/rad 975 x 10^-8kg/m² 2.5° 0.1mm 0.6mm Stainless Steel - -
RS Stock No. 449-0384
Mfr. Part No.MSPX-8-8-F
BrandRuland
HK$482.20
Each
units
8mm Rigid Coupling 24mm 35mm - - - - - - - - - -
RS Stock No. 183-186
BrandRS PRO
HK$101.13
Each
units
25mm HRC Coupling - 29mm - - - - - - - - - -
RS Stock No. 423-1860
Mfr. Part No.MJS33-10-A
BrandRuland
HK$181.44
Each
units
10mm Curved Jaw Coupling 33.3mm 44.5mm Set Screw - - - - - - - - -
RS Stock No. 748-421
Mfr. Part No.205.41.3636
BrandHuco
HK$199.63
Each
units
1/2in - - - - 3.5Nm - - 0.25mm - - - -
RS Stock No. 489-3761
Mfr. Part No.13005523
BrandLenze
HK$28.60
Each
units
- Straight Jaw Coupling - - - - - - 0.4mm 0.45mm - - -
RS Stock No. 171-6698
Mfr. Part No.721.32.3838
BrandHuco
HK$785.93
Each
units
14mm MultiBeam 3 Beam 31.8 44.5mm - 10Nm 378Nm/rad - 0.12 - Stainless Steel - -
RS Stock No. 186-4130
Mfr. Part No.PCMR32-10-10-A
BrandRuland
HK$726.44
Each
units
10mm - 31.8mm 38.1mm Clamping - 0.62°/Nm 9.948 x 10^-6kg/m² 0.38mm 0.25mm Aluminium - -
RS Stock No. 174-7274
Mfr. Part No.MBC15-5-4-A
BrandRuland
HK$740.05
Each
units
5mm Bellows Coupling 15mm 27.2mm Clamping 2.5Nm 8°/Nm - 1.5° 0.1mm 0.2mm Stainless Steel - -
RS Stock No. 477-9968
Mfr. Part No.MCLC-25-25-SS
BrandRuland
HK$1,400.60
Each
units
25mm Rigid Coupling 45mm 75mm - - - - - - - - - -
RS Stock No. 146-2831
Mfr. Part No.WES10M
BrandTB Woods
HK$2,937.79
Each
units
- Flexible Elastomer 165mm 223mm - 164Nm 1790Nm/rad - 1.6mm - - - -
RS Stock No. 435-1188
Mfr. Part No.MCLX-10-10-A
BrandRuland
HK$411.50
Each
units
10mm Rigid Coupling 29mm 45mm - - - - - - - - - -
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