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. 423-1804
Mfr. Part No.MJS19-6-A
BrandRuland
HK$88.63
Each
units
6mm Curved Jaw Coupling 19.1mm 27.2mm Set Screw - - - - - - - - -
RS Stock No. 808-7213
Mfr. Part No.VIVA-VS150-ELEMENT
BrandRexnord
HK$2,954.04
Each
units
- Tyre Coupling 150mm - - 250Nm - - 1.6mm 6.1mm - - -
RS Stock No. 814-433
Mfr. Part No.PCMR13-3-3-A
BrandRuland
HK$178.93
Each
units
3mm Beam Coupling 12.7mm 19.1mm - 0.92Nm 6.66°/Nm - 0.203mm 0.127mm - - -
RS Stock No. 808-7106
Mfr. Part No.OMEGA-E40-ELEMENT
BrandRexnord
HK$3,705.10
Each
units
- Tyre Coupling 9.5in - - 621Nm - - 0.031in 0.188in - - -
RS Stock No. 489-3862
Mfr. Part No.13024175
BrandLenze
HK$347.99
Each
units
7/16in Straight Jaw Coupling 54mm 54mm - - - - 0.12mm +1.4mm - - -
RS Stock No. 808-7092
Mfr. Part No.OMEGA-E20-ELEMENT
BrandRexnord
HK$3,443.63
Each
units
- Tyre Coupling 7.25in - - 260Nm - - 0.031in 0.188in - - -
RS Stock No. 364-3155
Mfr. Part No.PCR16-10MM-3/8”-A
BrandRuland
HK$280.62
Each
units
10mm Beam Coupling 25.4mm 31.8mm - - 1.8°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 808-7096
Mfr. Part No.OMEGA-E30-ELEMENT
BrandRexnord
HK$4,292.57
Each
units
- Tyre Coupling 8.25in - - 412Nm - - 0.031in 0.188in - - -
RS Stock No. 477-9895
Mfr. Part No.PCMR25-8-6-A
BrandRuland
HK$364.96
Each
units
- Beam Coupling 25.4mm 31.8mm - 3.73Nm 1.57°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 693-2417
Mfr. Part No.536.26.2222
BrandHuco
HK$329.74
Each
units
6mm Bellows Coupling 26mm 37.5mm Clamping 2.43Nm 755Nm/rad 330 x 10^-8kg/m² 0.06mm 0.36mm Stainless Steel - -
RS Stock No. 809-0727
Mfr. Part No.047.10.2222.RS
BrandHuco
HK$127.10
Each
units
6mm Double Loop Elastomer - 27mm - 0.5Nm - - 10° - 4.5mm - - -
RS Stock No. 489-3799
Mfr. Part No.13007045
BrandLenze
HK$59.12
Each
units
- Straight Jaw Coupling - - - - - - 0.4mm 0.45mm - - -
RS Stock No. 748-285
Mfr. Part No.321.17.3232
BrandHuco
HK$857.23
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. 306-2708
Mfr. Part No.632505
HK$328.24
Each
units
- - - - - - - - - - - - - -
RS Stock No. 492-9270
Mfr. Part No.KUP-1010-B
BrandSick
HK$312.10
Each
units
10mm - 21mm 29mm - - 120Nm/rad - 0.3mm 0.4mm - - -
RS Stock No. 808-7250
Mfr. Part No.ROTEX14-92SHEL-KTR
BrandKTR
HK$35.22
Each
units
- Curved Jaw Coupling - - - - - - 1.2° 0.17mm -0.5 mm, +1 mm - - -
RS Stock No. 748-207
Mfr. Part No.321.07.1414
BrandHuco
HK$609.00
Each
units
3mm Bellows Coupling 6.35mm 14mm Set Screw 41Ncm 7Nm/rad 1.3 x 10^-8kg/m² 11° 1mm 0.65mm Electrodeposited Nickel - -
RS Stock No. 364-3082
Mfr. Part No.PSR16-6-6-A
BrandRuland
HK$200.32
Each
units
3/8in Beam Coupling 1in 1.25in - 41lb/in 0.103°/lb-in - 0.015in 0.01in - - -
RS Stock No. 808-7358
Mfr. Part No.ROTEX42-98SHEL-KTR
BrandKTR
HK$204.11
Each
units
- Curved Jaw Coupling - - - - - - 0.32mm -1 mm, +2 mm - - -
RS Stock No. 477-9867
Mfr. Part No.PCMR19-6-5-A
BrandRuland
HK$286.17
Each
units
- Beam Coupling 19.1mm 22.9mm - 1.58Nm 2.9°/Nm - 0.203mm 0.127mm - - -
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