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. 808-7184
Mfr. Part No.VIVA-V110-ELEMENT
BrandRexnord
MYR500.27
Each
units
- Tyre Coupling 110mm - - 62Nm - - 1.6mm 4.2mm - - -
RS Stock No. 477-9902
Mfr. Part No.MCLX-6-6-SS
BrandRuland
MYR231.46
Each
units
6mm Rigid Coupling 18mm 30mm - - - - - - - - - -
RS Stock No. 808-7389
Mfr. Part No.ROTEX48-Complete-KTR
BrandKTR
MYR996.34
Each
units
48 → 62mm Curved Jaw Coupling 105mm 140mm - - - - 1.0° 0.36mm -1.00 mm, +2.1 mm - - -
RS Stock No. 489-3856
Mfr. Part No.13007068
BrandLenze
MYR173.49
Each
units
- Straight Jaw Coupling - - - - - - 0.5° 0.4mm 0.4mm - - -
RS Stock No. 810-0694
BrandRS PRO
MYR56.90
Each
units
8 → 19mm Gear coupling 32mm - - 16Nm - - 1mm - - - -
RS Stock No. 364-3060
Mfr. Part No.PSR12-4-4-A
BrandRuland
MYR122.80
Each
units
- Beam Coupling 0.75in 0.9in - 19lb/in 0.179°/lb-in - 0.008in 0.005in - - -
RS Stock No. 814-506
Mfr. Part No.PCMR25-8-8-A
BrandRuland
MYR195.64
Each
units
- Beam Coupling 25.4mm 31.8mm - 3.73Nm 1.57°/Nm - 0.381mm 0.254mm - - -
RS Stock No. 808-7288
Mfr. Part No.ROTEX19-Complete-KTR
BrandKTR
MYR174.70
Each
units
19 → 24mm Curved Jaw Coupling 41mm 66mm - - - - 1.1° 0.2mm -0.5 mm, +1.2 mm - - -
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. 808-7279
Mfr. Part No.ROTEX19-98SHEL-KTR
BrandKTR
MYR29.66
Each
units
- Curved Jaw Coupling - - - - - - 1.2° 0.2mm -0.5 mm, +1.2 mm - - -
RS Stock No. 489-3705
Mfr. Part No.13024168
BrandLenze
MYR75.31
Each
units
1/4in Straight Jaw Coupling 27.4mm 43mm Jaw - - - 0.12mm +1.4mm - - -
RS Stock No. 808-7367
Mfr. Part No.ROTEX42-Complete-KTR
BrandKTR
MYR846.66
Each
units
42 → 55mm Curved Jaw Coupling 95mm 126mm - - - - 0.9° 0.32mm -1.00 mm, +2.00 mm - - -
RS Stock No. 183-811
BrandRS PRO
MYR70.04
Each
units
50mm HRC Coupling - 38mm - - - - - - - - - -
RS Stock No. 693-0815
Mfr. Part No.452H50.38
BrandHuco
MYR129.95
Each
units
14mm Oldham (Sliding disc) 50mm - - - - - - - - - - -
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. 174-7167
Mfr. Part No.MBC15-3-3-A
BrandRuland
MYR502.34
Each
units
3mm Bellows Coupling 15mm 27.2mm Clamping 2.5Nm 8°/Nm - 1.5° 0.1mm 0.2mm Stainless Steel - -
RS Stock No. 808-7272
Mfr. Part No.ROTEX19-64SHEL-KTR
BrandKTR
MYR45.76
Each
units
- Curved Jaw Coupling - - - - - - 0.6° 0.1mm -0.5 mm, +1.2 mm - - -
RS Stock No. 449-0508
Mfr. Part No.MSPC-25-25-F
BrandRuland
MYR544.10
Each
units
25mm Rigid Coupling 45mm 75mm - - - - - - - - - -
RS Stock No. 325-8224
Mfr. Part No.MWS20-6-6-SS
BrandRuland
MYR256.27
Each
units
6mm Beam Coupling 20mm 20mm - 1.15Nm 2.48°/Nm - 0.2mm 0.12mm - - -
RS Stock No. 692-8159
Mfr. Part No.238.41
BrandHuco
MYR130.87
1 Bag of 5
Bag(s)
- Oldham (Torque disc) - - - 17Nm 1200Nm/rad - 0.5° 0.25mm 0.15mm - - -