Flexible Encoder Couplings

Flexible Encoder Couplings

Available in a Variety of Styles!

  • Magnetic, flexible, and disc options available
  • Available in both metric and inch sizes
  • Electrical isolation available on certain models
  • Perfect solution to pair with your encoder
  • Keeps your encoder running longer
  • Easy and simple installation
Outline Drawing
Avtron Encoders offers a wide range of different couplings to pair with your shafted encoder. Choose from magnetic, flexible helical, and flexible disc couplings depending on your need and application.

To pick the coupling you need, start by looking at your encoder model and application. Helical flexible couplings work best for light mill duty encoders with small amounts of misalignment. For more misalignment in light duty applications, shift to magnetic couplings. For harsher environments (even with large misalignment), look at our selection of flexible disc couplings to find the right product that you need. Then find the right size you need to mate with your encoder and motor. We offer couplings in both metric and inch sizes to fit any kind of shaft.

Couplings are the perfect way to help protect the life of your encoder. Shaft run-out, or "wobble" can cause excessive wear and tear on the bearings in your encoder, which can destroy the encoder and cause costly downtime for your business. Our couplings help to protect from shaft run-out by absorbing the excessive loads and forces that it causes.

Don't let shaft run-out destroy your encoder investment, order a coupling today!

Magnetic Couplings

        03 Models (Coupling Half): 0.22 Lbs. (0.10 Kg)
        06 Models (Coupling Half): 0.32 Lbs. (0.10 Kg)
Keyway: Only available on 11 mm and 12 mm


Flexible Helical Couplings
2024-T3.51 Aluminum w/ MIL A8625F Type II Black anodize
Isolator Insert: G10 glass filled phenolic
Clamp Screws:

        Screw Size: 6-32  

        Torque: 34 in.lbs.
Screw Type: 120° apart; hex socket steel/black oxide finish

Flexible Disc Couplings
Hub and Center Material: 
Anodized Aluminum
Rivet and Washer Material: 
Disc Material: 
Stainless Steel
Screw Type: 
18-8 Stainless Steel
Max Temp.: 
250° F (120° C)

  • Protects encoder bearings from excessive torque loads caused by run-out
Industry General Food & Beverage Pulp & Paper Wood Products Wind Power Crane & Hoist Metals Mining Marine Oil & Gas

Light Mill Duty

AV20, AV25, AV4, AV6A, AV6M, Avtron Elevator Encoder, Cables and Connectors, Encoder Couplings, Encoder Programming Tool, HS25A, HS35A, HS4, HS6A, K661, Rush AV4 Program, SC65

Mill Duty

AV32, Cables and Connectors, Encoder Couplings, HS35M, HS35X, HS6M, K661, M185, M3, M3(small), RAHS35M

Heavy Mill Duty

AV115, AV125, AV44, AV45, AV56, AV56-Wind, AV56S, AV67, AV85, AV850, AVSK, Cables and Connectors, Carlen Replacement, HS44, HS45, K661, M4, M4(small), XP5, XR115, XR12, XR125, XR45, XR4F, XR5, XR56, XR67, XR85, XR850, XR97, XRB1, XRB2, XRB3

Severe Mill Duty

AV12, AV30, AV485, AV5, AV685, Cables and Connectors, Carlen Replacement, Encoder Couplings, HS40, K661, M484, M6, M6C, M7, XP5, XPH1, XPH8, XR12, XR485, XR5, XR685, XR97, XRB1, XRB2, XRB3,
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In This Section

  • Axial Shaft Movement

    Motor shaft movement in or out, relative to the ends of the motor. Often motors that use roller or sleeve bearing construction have more axial shaft movement. Most Avtron modular encoders tolerate +/- 0.050" of axial movement maximum. Use hollow shaft encoders for high axial movement motor styles, such as MD motors. Most competitors’ modular encoders tolerate much less axial movement than Avtron products.

  • Coupled/Coupling

    Refers to a flexible device that is used to link a solid shaft encoder to the shaft to be monitored. Avtron strongly recommends isolated, flexible disk style couplings in heavy duty applications to maximize encoder bearing life. For light mill duty applications, flexible helical couplings are a great option. If there's a large amount axial shaft movement or misalignment, shift to magnetic couplings.

  • Light Mill Duty

    Light Mill Duty encoders are designed for industrial applications but must be protected from contamination, temperature cycling, and physical force, including shock, vibration, and bearing loads. Examples include AV20, AV25, HS25A, and HS35A models.

  • Motor Shaft Currents

    The high-speed switching of variable frequency drives that is used to control the speed of motors often produces current which flows from the motor shaft to ground, or from end-to-end of the motor.  These current are highly destructive to both motor and encoder bearings.  Preventing shaft current damage is essential.  Most Avtron hollow shaft encoders include features to prevent motor shaft current damage.  For more information:  http://www.avtronencoders.com/knowledge-base/eliminating-damage-from-motor-shaft-currents-through-tachometers-and-encoders or visit Wikipedia:  http://en.wikipedia.org/wiki/Shaft_voltage

  • Shaft Current

    The undesirable electrical current flow common to motors controlled by variable speed drives. This current attempts to circulate within the motor or discharge to ground. Avtron encoders are protected against shaft currents.

  • Shaft Runout

    The wobbling motion produced by a shaft that is not perfectly true and straight. Shaft runout is often abbreviated T.I.R. (Total Indicated Runout).

  • Solid Shaft

    Solid Shaft encoders are coupled to the shaft to be measured. The solid shaft encoder body is typically C-Face mounted using a flange adapter, or some models can be foot mounted.

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