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. 808-7096
Mfr. Part No.OMEGA-E30-ELEMENT
BrandRexnord
$1,031.16
Each
units
- Beam Coupling 8.25in - - 412Nm - 0.031in 0.188in -
RS Stock No. 808-7266
Mfr. Part No.ROTEX14-Complete-KTR
BrandKTR
$48.24
Each
units
6 → 16mm Jaw Coupling 30mm 35mm - - - 1.2° 0.17mm -0.5 mm, +1.0mm -
RS Stock No. 423-1703
Mfr. Part No.MJC19-8-A
BrandRuland
$27.60
Each
units
8mm Jaw Coupling 19.1mm 27.2mm - - - - - - -
RS Stock No. 477-9873
Mfr. Part No.PCMR25-10-6-A
BrandRuland
$100.32
Each
units
- Beam Coupling 25.4mm 31.8mm - - - 0.381mm 0.254mm -
RS Stock No. 809-0758
Mfr. Part No.047.20.3232.RS
BrandHuco
$46.70
Each
units
10mm Specialist Coupling - 48mm - 1.8Nm - 15° - 7.5mm -
RS Stock No. 808-7103
Mfr. Part No.OMEGA-ES3-ELEMENT
BrandRexnord
$466.42
Each
units
- Beam Coupling 4in - - 41Nm - 0.063in 0.188in -
RS Stock No. 477-9930
Mfr. Part No.MCLX-12-12-SS
BrandRuland
$107.83
Each
units
12mm Shaft Coupling 29mm 45mm - - - - - - -
RS Stock No. 748-207
Mfr. Part No.321.07.1414
BrandHuco
$159.36
Each
units
3mm Bellows Coupling 6.35mm 14mm - 41Ncm - 11° 1mm 0.65mm -
RS Stock No. 837-1063
Mfr. Part No.L075
BrandSKF
$32.19
Each
units
9mm Jaw Coupling 44.5mm 21mm - - - - - - -
RS Stock No. 296-9844
Mfr. Part No.MCLX-12-12-F
BrandRuland
$62.93
Each
units
12mm Shaft Coupling 29mm 45mm - - - - - - -
RS Stock No. 489-3812
Mfr. Part No.13005520
BrandLenze
$7.26
Each
units
- Jaw Coupling - - - - - 0.5° 0.4mm 0.4mm -
RS Stock No. 410-6512
Mfr. Part No.RS1761026
BrandHengstler
$40.31
Each
units
- - 15mm 20mm - 70Ncm - 2.5° 0.3mm 0.2mm -
RS Stock No. 492-9270
Mfr. Part No.KUP-1010-B
BrandSick
$67.36
Each
units
10mm - 21mm 29mm - - 120Nm/rad 0.3mm 0.4mm -
RS Stock No. 810-0694
BrandRS PRO
$21.36
Each
units
8 → 19mm Gear Coupling 32mm - - 16Nm - 1mm - -
RS Stock No. 449-0479
Mfr. Part No.MSPX-25-25-F
BrandRuland
$157.84
Each
units
25mm Shaft Coupling 45mm 75mm - - - - - - -
RS Stock No. 449-0356
Mfr. Part No.MCLX-16-16-F
BrandRuland
$74.26
Each
units
16mm Shaft Coupling 34mm 50mm - - - - - - -
RS Stock No. 449-0536
Mfr. Part No.MSPC-20-20-F
BrandRuland
$184.57
Each
units
20mm Shaft Coupling 42mm 65mm - - - - - - -
RS Stock No. 810-0710
BrandRS PRO
$7.15
Each
units
- Gear Coupling 40mm 37mm - - - - 1mm - -
RS Stock No. 693-2455
Mfr. Part No.550.16.1414
BrandHuco
$44.36
Each
units
3mm Bellows Coupling 16mm 21mm - 0.5Nm - 0.1mm 0.2mm -
RS Stock No. 325-8094
Mfr. Part No.MWC25-8-8-SS
BrandRuland
$161.51
Each
units
- Beam Coupling 30mm 24mm - 3.42Nm - 0.38mm 0.25mm -