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Flexible Couplings

Flexible couplings are mechanical devices that connect two shafts together while allowing a certain degree of misalignment, axial movement, or torsional vibration between them. They are designed to transmit torque from one shaft to another while compensating for any misalignment or occurring movement. Flexible couplings typically comprise two hubs or flanges, one attached to each shaft and a flexible element in between. The flexible element can be made of various materials, such as elastomers (rubber), metals (steel), or a combination of both. The material choice depends on the specific application and the coupling’s desired properties.

What is the Primary Function of a Flexible Coupler? What Causes Misalignments?

The primary purpose of a flexible coupler is to transmit power and rotational motion between two shafts while minimising misalignment effects. Misalignment can occur due to various factors, such as thermal expansion, manufacturing tolerances, or external forces acting on the system.

What is a Mechanical Coupling or Coupler?

A Coupling, or coupler, is a mechanical device designed for power transmission by connecting two rotating shafts together. Couplers can be rigid or flexible couplers widely used in motor control applications, including vehicles, machinery, and other mechanical systems. 

The Difference Between Rigid and Flexible Coupling

Rigid and flexible coupling differ based on their functions and adhered properties. Rigid couplings are used for precise alignments, requiring no movement between the rigid coupler and the shaft. On the other hand, flexible couplings provide a certain degree of flexibility in motion and misalignment between shaft couplers.

Potential Benefits of Flexible Couplings

Flexible couplings offer several benefits in various mechanical systems. Some key advantages of using flexible couplings include:

  • They are highly flexible.
  • They provide misalignment compensation, improving performance and durability.
  • Shock absorption and reduced vibrations.
  • Transmit torque between shafts, ensuring reliable power transmission.
  • Flexible couplings possess sufficient torsional stiffness for accurate torque transmission.
  • Easy to install with minimal maintenance requirements.
  • Compact and lightweight.
  • Durable and versatile with a long lifespan.

Types of Flexible Couplings

There are several types of flexible couplings available, including:

  • Gear Couplings – These couplings use gear teeth to transmit torque between the shafts, accommodating high torque and misalignment. 
  • Jaw Couplings – Jaw couplers comprise two hubs with curved jaws and an elastomeric insert. They provide a simple and economical solution for transmitting torque while allowing angular misalignment.
  • Oldham Couplings – Oldham couplings use three discs, with two external discs connected to the shafts and a middle disc serving as a connecting element. Oldham couplers significantly compensate for parallel misalignment but have limited angular misalignment capacity.
  • Bellow Couplings – These couplings can accommodate various misalignment forms while maintaining a balanced design that minimises vibration during high-speed operations.
  • Diaphragm Couplings – Diaphragm couplings are highly flexible and use a series of thin metallic diaphragms to transmit torque. They allow significant misalignment and torsional vibration dampening in various motion control applications.
  • Fluid Couplings – Fluid couplings use hydraulic fluid to transmit torque and are used where smooth torque transmission is required without shock loads.
  • Disc Couplings – Disc couplings integrate a series of thin metallic discs stacked alternately, ensuring high torque transmission and misalignment compensation.

Best Flexible Couplings Available at Enrgtech

Enrgtech carries extensive collections of branded flexible couplings, such as Huco couplings, KTR couplings, Omron couplings, and more. We offer these mechanical couplings, rubber couplings, tyre couplings, and specialist couplings at the best possible prices and speedy delivery services worldwide. Visit our website to discover other power transmission couplings available in bulk.


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PSMR19-4-4-A, Ruland
3 In Stock
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1 +
£ 21.86
5 +
£ 21.01
10 +
£ 20.55
Rohs Verified
FSMR32-10-10-A, Ruland
4 In Stock
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£ 45.16
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£ 43.35
10 +
£ 42.46
JD26/41-92Y, Ruland
70 In Stock
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£ 8.89
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£ 8.53
20 +
£ 8.36
Rohs Verified
850.13.24, Huco
Pre Order
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£ 38.46
Rohs Verified
450H13.22, Huco
15 In Stock
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£ 25.03
Rohs Verified
PHE FRC130RSB, SKF
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£ 33.98
Rohs Verified
PHE FRC150FTB, SKF
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£ 33.73
Rohs Verified
PHE FRC150HTB, SKF
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£ 33.73
Rohs Verified
PHE FRC90RSB, SKF
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£ 12.67
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FCMR25-10-10-A, Ruland
29 In Stock
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£ 37.97
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£ 36.44
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£ 35.69
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PSMR13-4-4-A, Ruland
8 In Stock
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£ 20.51
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£ 19.70
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£ 19.28
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E69-C06B, Omron
63 In Stock
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£ 18.59
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£ 18.02
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£ 17.24
JD12/19-85B, Ruland
52 In Stock
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£ 7.41
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£ 7.13
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£ 6.97
Rohs Verified
450H13.20, Huco
126 In Stock
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£ 25.03
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850.19.24, Huco
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£ 44.71
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£ 42.93
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£ 42.03
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FCMR19-6-6-A, Ruland
7 In Stock
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£ 34.08
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£ 32.72
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£ 32.04
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FSMR32-12-12-A, Ruland
13 In Stock
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£ 45.16
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£ 43.35
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£ 42.46
JD21/33-85B, Ruland
36 In Stock
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£ 8.22
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PSMR19-6-6-A, Ruland
87 In Stock
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£ 20.38
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£ 19.58
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£ 19.15
Rohs Verified
PHE FRC230FTB, SKF
1 In Stock
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£ 94.19
Rohs Verified
PHE FRC230HTB, SKF
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£ 94.19
Rohs Verified
PHE L110HUB, SKF
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£ 29.66
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PCMR19-5-5-A, Ruland
58 In Stock
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£ 26.31
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£ 25.26
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£ 24.73
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PHE FRC130FTB, SKF
1 In Stock
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£ 26.07
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PHE FRC180FTB, SKF
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£ 53.06
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New Items
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E69-C08B, Omron

E69-C08B, Omron

Couplings for Rotary Encoders Couplings suitable for use with the E6C3 series of rotary encoders.
New items
BOWEXM42-COMPLETE, KTR

BOWEXM42-COMPLETE, KTR

BoWex M Tooth Gear Couplings BoWex® Curved-tooth gear couplings® are flexible shaft connections for a positive torque transmission and used to compensate for axial, radial and angular shaft misalignment. Using curved-tooth gear couplings® avoids any edge pressure in the spline plus angular and radial displacements are avoided so that BoWex® couplings are almost free from wear. The material combination of steel hubs and polyamide sleeves allows for maintenance free continuous operation with low friction on the teeth. While any metallic materials tend to "corrode" in case of dry running, slide combinations with polyamide and steel are operative without any lubrication or maintenance. Due to the double cardanic operation of BoWex® couplings, restoring forces can be neglected in case of angular and radial displacements. Periodic fluctuations in angular velocity do not arise. BoWex® couplings can be assembled both vertically or horizontally with no need for any special assembly tools. The smooth and hard surface plus the high thermal stability and resistance to lubricants, fuels, hydraulic fluids, dissolvents, and so on, make polyamide an ideal material for components stressed by sliding, particularly for the coupling production. Features and Benefits •Double cardanic curved-tooth gear coupling® •For all applications in the range of machinery and hydraulics •Maintenance free due to material combination nylon/steel •Taper and inch bores for hydraulic pumps •100° maximum operating temperature •Absorbs axial, angular and radial misalignment •Torsionally rigid •Short shaft distance Product Application Information Food industry, print and paper industry, textile industry, sewage technology, wash-mobiles, chemical and pharmaceutical, offshore units, and so on. For use in aggressive environments (air, water, chemicals, and so on). Note Hubs are supplied unbored, it is down to the customer to machine to finish, within the couplings parameters. Warning BoWex® coupli...
New items
MWC20-6-6-SS, Ruland

MWC20-6-6-SS, Ruland

Stainless Steel Flexible Shaft Couplings Designed to perform where higher speeds, greater misalignment, and limited lubrication would exceed the capabilities of other couplings. Each coupling is manufactured as one piece, thereby eliminating mechanical joints and possible failure points.Two fixing styles available:,Typical applications include encoders, stepper motors, robotics, measuring instruments, servo systems, pumps, valves, fans etc., (i) Set Screw style is secured using one grub-screw per shaft (staggered at 120°) , (ii) Clamp style fixing uses one socket head cap screw per shaft. Constant velocity couplings with high torque capacity and zero backlash Torsionally rigid one-piece construction Not temperature sensitive High or low speed operation and reversible No lubrication required Up to 3° of axial misalignment allowable Note The coupling shown represents the clamp style fixing
New items
MJC25-8-A, Ruland

MJC25-8-A, Ruland

Clamp Style Clamp style jaw couplings from Ruland. These couplings have a large torque capacity and a balanced design. To complete your assembly two hubs must be purchased. A jaw spider must be placed in between these couplings. Please view our essential extras for suitable jaw spider torque disks. Note Coupling shown for illustration purposes only. Two hubs required per coupling assembly. A complete coupling assembly comprises two hubs plus an appropriate torque disc ; note that these parts must all be ordered separately Jaw Couplings A range of zero backlash curved jaw couplings. Three piece coupling comprising two aluminium hubs and an elastic insert (spider). Polyurethane spider provides damping of impulse loads, minimising shock to the motor and other sensitive equipment. Offered in two hardness levels the spiders can be used to customise the coupling performance. Low to medium torsional rigidity and strength An electrically isolating coupling solution A balanced design suited to high bearing loads and moderate inertia Accommodates slight angular, axial and parallel misalignments One complete coupling comprises two aluminium hubs and a spider (order separately) Use 92 Shore spider to give the best dampening characteristics and 98 Shore spider for the best torsional rigidity Snap fit spider ensures zero backlash and high torque capabilities Fail-safe design allowing operation of coupling even if spider element fails 2 hubs required per coupling assembly Nominal Size (mm) Hardness (Shore A) Maximum Angular Misalignment (mm) Maximum Axial Misalignment (mm) Maximum Axial Motion (mm) Rated Torque (Nm) Torsional Stiffness (Nm/rad.) Break Torque (Nm) 19 92 1 0.13 0.8 3 31 3 19 98 1 0.08 0.8 5 50 5 25 92 1 0.15 1.0 7 115 7 25 98 1 0.09 1.0 12 175 12 33 92 ...
New items
MOCT51-19-A, Ruland

MOCT51-19-A, Ruland

Ruland Oldham Coupling Hub - Clamp Style Ruland Clamp Style Oldham Couplings are ideally suited to enable shafts to be coupled with a small amount of axial and angular misalignment present. The three-piece design consists of two hubs linked by a centre torque disc. The Clamp Style Hubs are manufactured from black anodised aluminium, with replaceable centre discs manufactured from acetal or nylon. Oldham couplings are ideal for light industrial and motion control applications, and, due to their unique design, Oldham couplings offer the ability to protect machinery from torque overload forces (acting as torque limiters), with centre discs that are able to break cleanly. 2 hubs and 1 torque disc required per assembly Technical specification Size Code Hub Depth (mm) Depth of Bore (mm) Hub Outside Diameter (mm) Overall Coupling Assembly Length (mm) Set Screws 19 9.7 9.7 19.1 25.4 M2.5 25 11.9 31.8 25.4 11.9 M3 33 15 47.6 33.3 15 M3 41 18 50.8 41.3 18 M4 51 20.8 59.7 50.8 20.8 M5 57 28.7 78.7 57.2 28.7 M6 Note Not supplied as a complete unit ; 2 Hubs and 1Torque Disc required per assembly. Ruland Oldham Style Couplings Paradrive™ couplings are ideal for motion control applications, especially those utilising stepper or servo motors. Their low inertia design is ideally suited to higher speed applications and where electrical isolation is also required. Small angular and axial misalignments may be accommodated. Securing: 13mm and 19mm anodised aluminium hubs are secured to the shafts with one set screw on each end. 33mm, 35mm and 41mm hubs have 2 set screws set 90° apart
New items
321.12.2424, Huco

321.12.2424, Huco

Nickel Bellows Couplings The bellows is a traditional mechanism for flexibly connecting two rotating shafts with angular, parallel and axial offset capability. Can be used with the RS range of bore reducers. High torsional stiffness High quality of translation of motion Suitable for drives associated with instruments Grub screw fixing Coupler Diameter (mm) Number of Active Convolutions Max. Dynamic Torque (Ncm) Torsional Deflection (Arc mins per Ncm) Max. Axial Offset (mm) Max. Angular Offset (°) Max. Parallel Misalignment (mm) Wall Thickness (microns) Approx. Weight (g) 7 7 2.5 n/a ±1.0 11 ±1.0 25 2 12 13 6.0 1.2 -2.2 14 +1.6 to -2.2 38 7 17 13 25.0 0.43 -4.0 18 +3.0 to -4.0 50 7 25 9 250.0 0.08 -3.5 10 +2.7 to -3.5 90 13 Note Service life can be affected with load reversal applications or when driving loads incrementally. Bore size attirbute refers to dimensions B1 and B2 in in that order.
New items
BOWEXM65-HUB-PB, KTR

BOWEXM65-HUB-PB, KTR

Bowex M Tooth Gear Coupling Hub BoWex® Curved-tooth gear couplings® are flexible shaft connections for a positive torque transmission and used to compensate for axial, radial and angular shaft misalignment. Using curved-tooth gear couplings® avoids any edge pressure in the spline plus angular and radial displacements are avoided so that BoWex® couplings are almost free from wear. The material combination of steel hubs and polyamide sleeves allows for maintenance free continuous operation with low friction on the teeth. While any metallic materials tend to "corrode" in case of dry running, slide combinations with polyamide and steel are operative without any lubrication or maintenance. Due to the double cardanic operation of BoWex® couplings, restoring forces can be neglected in case of angular and radial displacements. Periodic fluctuations in angular velocity do not arise. BoWex® couplings can be assembled both vertically or horizontally with no need for any special assembly tools. The smooth and hard surface plus the high thermal stability and resistance to lubricants, fuels, hydraulic fluids, dissolvents, and so on, make polyamide an ideal material for components stressed by sliding, particularly for the coupling production. Features and Benefits •Double cardanic curved-tooth gear coupling® •For all applications in the range of machinery and hydraulics •Maintenance free due to material combination nylon/steel •Taper and inch bores for hydraulic pumps •100° maximum operating temperature •Absorbs axial, angular and radial misalignment •Torsionally rigid •Short shaft distance Product Application Information Food industry, print and paper industry, textile industry, sewage technology, wash-mobiles, chemical and pharmaceutical, offshore units, and so on. For use in aggressive environments (air, water, chemicals, and so on). Note ...
New items
HPK2835, OPTIBELT

HPK2835, OPTIBELT

The OPTIBELT HPK coupling transmits torque without backlash or vibration. The equalizing element of the HPK coupling is the star. The high precision star insert defines the characteristics of the entire drive system. High concentricity Vibration reducing Electrically isolating Pluggable
New items
HPN3816, OPTIBELT

HPN3816, OPTIBELT

The OPTIBELT HPN coupling transmits torque without backlash or vibration. This flexible coupling consist of two hubs with curved jaws. This HPN coupling has been designed to compensate radial, axial and angular movements. Electrically isolating Vibration reducing High concentricity Low cost Pluggable
New items
HRC230B, OPTIBELT

HRC230B, OPTIBELT

The OPTIBELT flexible HRC coupling is a breakthrough safe claw coupling with a flexible element to provide flexible connection of shafts. The HRC coupling can be used in the whole of machine construction wherever a reliable shaft connection is needed between motor and working machine. Maximum operational safety Effectively noise can absorbed Resistance to wear and oil Backlash free
New items
HRC230F, OPTIBELT

HRC230F, OPTIBELT

The OPTIBELT flexible HRC coupling is a breakthrough safe claw coupling with a flexible element to provide flexible connection of shafts. The HRC coupling can be used in the whole of machine construction wherever a reliable shaft connection is needed between motor and working machine. Effectively noise can absorbed Fast and easy installation Resistance to wear and oil Backlash free
New items
DP250KA, OPTIBELT

DP250KA, OPTIBELT

The OPTIBELT Claw couplings is a flexible coupling which is used with flexible element to provide a flexible connection of shafts. The flexible elements excel in their wear resistance and ageing resistance. This couplings can be used in the whole of machine construction. Reliable shaft connection between motor and working machine Manufactured in three piece design Effectively noise can absorbed Plug in type for installation
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