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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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Manufacturer Part No
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OPTIBELT
Rohs Verified
PDP160, OPTIBELT
Pre Order
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1 +
£ 13.97
OPTIBELT
Rohs Verified
STERNH2498, OPTIBELT
1 In Stock
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1 +
£ 4.78
OPTIBELT
Rohs Verified
STERNH38, OPTIBELT
5 In Stock
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1 +
£ 11.46
OPTIBELT
Rohs Verified
STERNH3898, OPTIBELT
3 In Stock
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1 +
£ 11.46
OPTIBELT
Rohs Verified
STERNH48, OPTIBELT
10 In Stock
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£ 20.05
Rohs Verified
PCMR13-3-3-A, Ruland
74 In Stock
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£ 23.11
5 +
£ 22.16
10 +
£ 21.72
Rohs Verified
FCMR19-5-5-A, Ruland
2 In Stock
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£ 34.08
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£ 32.72
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£ 32.04
Rohs Verified
PCMR25-8-6-A, Ruland
76 In Stock
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£ 32.58
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£ 31.27
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£ 30.63
Rohs Verified
PSMR25-10-10-A, Ruland
75 In Stock
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£ 24.33
5 +
£ 23.36
10 +
£ 22.87
Rohs Verified
592.45.3838, Huco
2 In Stock
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£ 100.80
5 +
£ 93.04
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£ 91.12
Rohs Verified
592.56.3838, Huco
2 In Stock
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£ 158.65
Rohs Verified
592.66.5858, Huco
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£ 186.91
Rohs Verified
593.66.4646, Huco
Pre Order
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£ 186.91
Rohs Verified
593.82.6565, Huco
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£ 273.24
Rohs Verified
554.56.5252, Huco
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£ 144.27
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£ 133.16
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£ 130.42
Rohs Verified
555.56.5454, Huco
Pre Order
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£ 144.27
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£ 133.16
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£ 130.42
Rohs Verified
PHE L150HUB, SKF
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£ 39.93
Rohs Verified
PHE 1070TGGRID, SKF
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£ 56.21
Rohs Verified
PHE 1080TGHCOVER, SKF
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£ 94.03
Rohs Verified
PHE 25GCRSB, SKF
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£ 167.87
Rohs Verified
PHE 35GCCOVER, SKF
1 In Stock
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£ 215.43
Rohs Verified
PHE 35GCRSB, SKF
1 In Stock
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£ 152.08
Rohs Verified
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
Rohs Verified
PCMR19-6-5-A, Ruland
130 In Stock
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£ 27.85
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£ 26.73
10 +
£ 26.19
Rohs Verified
E69-C06B, Omron
26 In Stock
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£ 18.59
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£ 18.02
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£ 17.24
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New Items
New items
184-684, RS Pro

184-684, RS Pro

HRC Coupling HRC semi elastic couplings for general purpose use. Available as F flange type, bush mounted from inside, and H flange bush, inserted from outside face. Taper Bush Fixing Allows Quick and Easy Assembly Simple Alignment by Straight Edge Accommodates Minor Misalignment Wrench Clearance for Tightening Bush on Shaft is 29mm (size 70, 90) and 38mm (size 110, 130) – Use of Shortened Wrench will Reduce the Required Dimensions Standard Nitrile Rubber Insert Temperature Range -40°C to +100°C Dimensions Size (mm) Maximum Bore Size (mm) Maximum Bore Size (in.) A (mm) B (mm) C (mm) D (mm) Bush Type E (mm) F (mm) G (mm) L (mm) 70 25 1 69 60 20.0 23.5 1008 31 25 18 65 90 28 1 1/8 85 70 19.5 23.5 1108 32 30.5 22.5 69.5 110 42 1 5/8 112 100 18.5 26.5 1610 45 45 29 82 130 42 1 5/8 130 105 18.0 26.5 1610 50 53 36 89 Note One complete coupling comprises of two flanges and one insert (to be ordered separately). Warning Not FRAS approved.
New items
MJC25-10-A, Ruland

MJC25-10-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 1 0.15 1.0 9 590 9 33 98 1 0.09 1.0 15 890 15
New items
FCMR38-12-12-SS, Ruland

FCMR38-12-12-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
FCMR38-16-16-SS, Ruland

FCMR38-16-16-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
530.26.3232, Huco

530.26.3232, Huco

Stainless Steel Bellows Couplings - Set Screw Type High torsional stiffness for positional accuracy Low inertia Ideal for servo drive applications with high precision dynamic position control Material: Aluminium hub; stainless steel bellows
New items
537.20.2222, Huco

537.20.2222, Huco

Stainless Steel Bellows Couplings - Clamp Type High torsional stiffness for positional accuracy Low inertia Ideal for servo drive applications with high precision dynamic position control Material: Aluminium hub; stainless steel bellows
New items
721.19.2828, Huco

721.19.2828, Huco

Beam couplings will readily accommodate any combination of axial motion, angular and parallel misalignment. The 3 start helical-cut design provides higher torque capability and reduced wind-up compared with single beam versions. Multi-Beam is available in three standard materials: stainless steel, aluminium and acetal, for shaft diameters from 1mm to 38mm. Torsionally rigid design Zero backlash No moving parts Single beam simple coupling compatible with industry standard types 3-Beam single stage for increased torsional stiffness 6-Beam two stage for torsional stiffness and increased radial compliance Step Beam for low inertia, electrical isolation, low cost
FAQs
We offer free shipping for orders over £200 if delivery is in the UK. All other orders in the UK, shipping from £7.99 depending on the weight and measurement. Mainland Europe shipping charges start from £25. For all other countries shipping charges start from £50 for products like Flexible Couplings and all others.
You can email us directly at sales@enrgtech.co.uk or via our website for any queries regarding Flexible Couplings or any other product.
This depends on the Flexible Couplings individual product and information that can be found on our website.
Yes, we offer special discounts on orders above £200 for Flexible Couplings and all other products.
UK orders normally take between 2/3 working days. International orders normally take between 3/5 working days for all products including Flexible Couplings.
Yes. We keep updating our stock frequently and if a product like Flexible Couplings is not in stock then we will let you know.