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 Misalignment - Angular Misalignment - Parallel Misalignment - Axial Bellows Material
RS Stock No. 423-1804
Mfr. Part No.MJS19-6-A
BrandRuland
HK$137.94
Each
units
6mm Jaw Coupling 19.1mm 27.2mm - - - - - - -
RS Stock No. 808-7213
Mfr. Part No.VIVA-VS150-ELEMENT
BrandRexnord
HK$3,242.34
Each
units
- Beam Coupling 150mm - - 250Nm - 1.6mm 6.1mm -
RS Stock No. 364-3155
Mfr. Part No.PCR16-10MM-3/8”-A
BrandRuland
HK$406.87
Each
units
10mm Beam Coupling 25.4mm 31.8mm - - - 0.381mm 0.254mm -
RS Stock No. 808-7106
Mfr. Part No.OMEGA-E40-ELEMENT
BrandRexnord
HK$4,066.38
Each
units
- Beam Coupling 9.5in - - 621Nm - 0.031in 0.188in -
RS Stock No. 489-3862
Mfr. Part No.13024175
BrandLenze
HK$433.28
Each
units
7/16in Jaw Coupling 54mm 54mm - - - 0.12mm +1.4mm -
RS Stock No. 814-433
Mfr. Part No.PCMR13-3-3-A
BrandRuland
HK$268.61
Each
units
3mm Beam Coupling 12.7mm 19.1mm - 0.92Nm - 0.203mm 0.127mm -
RS Stock No. 808-7092
Mfr. Part No.OMEGA-E20-ELEMENT
BrandRexnord
HK$3,633.24
Each
units
- Beam Coupling 7.25in - - 260Nm - 0.031in 0.188in -
RS Stock No. 809-0727
Mfr. Part No.047.10.2222.RS
BrandHuco
HK$155.03
Each
units
6mm Specialist Coupling - 27mm - 0.5Nm - 10° - 4.5mm -
RS Stock No. 693-2417
Mfr. Part No.536.26.2222
BrandHuco
HK$500.18
Each
units
6mm Bellows Coupling 26mm 37.5mm - 2.43Nm - 0.06mm 0.36mm -
RS Stock No. 477-9895
Mfr. Part No.PCMR25-8-6-A
BrandRuland
HK$364.76
Each
units
- Beam Coupling 25.4mm 31.8mm - 3.73Nm - 0.381mm 0.254mm -
RS Stock No. 808-7096
Mfr. Part No.OMEGA-E30-ELEMENT
BrandRexnord
HK$4,750.70
Each
units
- Beam Coupling 8.25in - - 412Nm - 0.031in 0.188in -
RS Stock No. 810-0726
BrandRS PRO
HK$80.40
Each
units
- Gear Coupling 66mm 46mm - - - - 1mm - -
RS Stock No. 492-9270
Mfr. Part No.KUP-1010-B
BrandSick
HK$392.91
Each
units
10mm - 21mm 29mm - - 120Nm/rad 0.3mm 0.4mm -
RS Stock No. 748-213
Mfr. Part No.321.07.1416
BrandHuco
HK$897.37
Each
units
1/8in Bellows Coupling 6.35mm 14mm - 41Ncm - 11° 1mm 0.65mm -
RS Stock No. 693-2502
Mfr. Part No.530.41.3535
BrandHuco
HK$421.56
Each
units
12mm Bellows Coupling 41mm 49.7mm - 7.61Nm - 2.5° 0.15mm 0.8mm -
RS Stock No. 814-607
Mfr. Part No.PSMR19-6-6-A
BrandRuland
HK$227.91
Each
units
- Beam Coupling 19.1mm 22.9mm - 1.58Nm - 0.203mm 0.127mm -
RS Stock No. 489-3799
Mfr. Part No.13007045
BrandLenze
HK$81.94
Each
units
- Jaw Coupling - - - - - 0.4mm 0.45mm -
RS Stock No. 306-2708
Mfr. Part No.632505
HK$535.84
Each
units
- - - - - - - - - - -
RS Stock No. 814-540
Mfr. Part No.PSMR10-3-3-A
BrandRuland
HK$215.45
Each
units
- Beam Coupling 9.5mm 14.3mm - 0.62Nm - 0.203mm 0.127mm -
RS Stock No. 477-9924
Mfr. Part No.MCLX-10-10-SS
BrandRuland
HK$629.98
Each
units
10mm Shaft Coupling 29mm 45mm - - - - - - -