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. Theyre 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. 183-186
BrandRS PRO
kr 109,05
Each
Units
25mm HRC Coupling - 29mm - - - - - - - - - -
RS Stock No. 814-540
Mfr. Part No.PSMR10-3-3-A
BrandRuland
kr 258,78
Each
Units
- Beam Coupling 9.5mm 14.3mm - 0.62Nm 11.83°/Nm - 0.203mm 0.127mm - - -
RS Stock No. 449-0520
Mfr. Part No.MSPC-30-30-F
BrandRuland
kr 1 417,92
Each
Units
30mm Rigid Coupling 53mm 83mm - - - - - - - - - -
RS Stock No. 808-7294
Mfr. Part No.ROTEX24-64SHEL-KTR
BrandKTR
kr 110,20
Each
Units
- Curved Jaw Coupling - - - - - - 0.45° 0.11mm -0.5 mm, +1.4 mm - - -
RS Stock No. 692-8112
Mfr. Part No.236.33
BrandHuco
kr 72,02
1 Bag of 5
Bag(s)
- Oldham (Torque disc) - - - 9Nm 615Nm/rad - 0.5° 0.2mm 0.15mm - - -
RS Stock No. 296-9800
Mfr. Part No.MCLX-6-6-F
BrandRuland
kr 258,78
Each
Units
6mm Rigid Coupling 18mm 30mm - - - - - - - - - -
RS Stock No. 810-0694
BrandRS PRO
kr 105,25
Each
Units
8 19mm Gear coupling 32mm - - 16Nm - - 1mm - - - -
RS Stock No. 423-2194
Mfr. Part No.JD21/33-98R
BrandRuland
kr 53,24
Each (In a Pack of 2)
Units
- Curved Jaw Coupling 33.3mm - - - - - 0.8° 0.08mm 0.76mm - 98Shore A 33 mm Hubs
RS Stock No. 748-235
Mfr. Part No.321.12.2222
BrandHuco
kr 647,91
Each
Units
6mm Bellows Coupling 12mm 23mm Set Screw 79Ncm 27Nm/rad 18.5 x 10^-8kg/m² 14° +1.6 -2.2mm 1.72mm Electrodeposited Nickel - -
RS Stock No. 808-7320
Mfr. Part No.ROTEX28PB-STHUB-KTR
BrandKTR
kr 279,00
Each
Units
28 38mm Curved Jaw Coupling 66mm 52.5mm - - - - - - - - - -
RS Stock No. 810-0690
BrandRS PRO
kr 88,71
Each
Units
6 14mm Gear coupling 25mm - - 10Nm - - 1mm - - - -
RS Stock No. 689-9698
Mfr. Part No.FSMR38-16-16-SS
BrandRuland
kr 1 574,96
Each
Units
- Beam Coupling 38.1mm 57.15mm - 10.73Nm 0.392°/Nm - 0.762mm 0.381mm - - -
RS Stock No. 184-735
BrandRS PRO
kr 171,48
Each
Units
28mm HRC Coupling - 29mm - - - - - - - - - -
RS Stock No. 810-0726
BrandRS PRO
kr 76,70
Each
Units
- Gear coupling 66mm 46mm - - - - - 1mm - - - -
RS Stock No. 435-1144
Mfr. Part No.MCLX-4-4-A
BrandRuland
kr 273,53
Each
Units
4mm Rigid Coupling 15mm 22mm - - - - - - - - - -
RS Stock No. 808-7260
Mfr. Part No.ROTEX19-92SHEL-KTR
BrandKTR
kr 56,96
Each
Units
- Curved Jaw Coupling - - - - - - 1.2° 0.2mm -0.5 mm, +1.2 mm - - -
RS Stock No. 701-9149
Mfr. Part No.MJC41-20-A
BrandRuland
kr 257,95
Each
Units
20mm Curved Jaw Coupling 41.3mm 53mm Clamp - - - - - - - - -
RS Stock No. 814-483
Mfr. Part No.PCMR19-6-6-A
BrandRuland
kr 395,70
Each
Units
- Beam Coupling 19.1mm 22.9mm - 1.58Nm 2.9°/Nm - 0.203mm 0.127mm - - -
RS Stock No. 692-8106
Mfr. Part No.236.13
BrandHuco
kr 40,65
1 Bag of 10
Bag(s)
- Oldham (Torque disc) - - - 0.5Nm 65Nm/rad - 0.5° 0.1mm 0.05mm - - -
RS Stock No. 808-7143
Mfr. Part No.OMEGA-E10-HUB-PB
BrandRexnord
kr 1 113,33
Each
Units
42 55mm Tyre Coupling 6.38in 3.81in - 164Nm - - - - - - - -
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