Avtron M3-(3-5, A-F) Small Bore Encoders

Avtron M3-(3-5, A-F) Small Bore Encoders

Obsolete, Replaced by HS45

  • No Longer Available-See HS45
  • See documents tab for HS45 upgrade details and benefits
Outline Drawing

Avtron M3 small bore hollow shaft encoders were replaced by the upgraded HS45 model. Looking for solid shaft M3-1 and M3-2 models? They were replaced by the severe duty AV485 upgrade encoder. 
Use our cross reference page.

Also available:  Large bore M3 and M4 encoders for applications 1 1/2"- 2 3/8" [48-60mm], and heavy mill duty HS45 and severe duty AV685 encoders.

Operating Power: 5-24 VDC; Current 120mA, no load
Output Format: A,A–, B,B–, C,C–; Marker Z,Z–
Frequency Range: 0 to 150 KHz
PPR: 240-2500
  • 5000 RPM Max. Std., shafts 5/8" to 1 5/8"
  • 3600 RPM Max. Std., shafts 2" to 2 3/8"
(for higher speeds, consult factory)
Temperature: -40°* to 85°C (*-20° standard)
Chemical: Polyurethane enamel paint protects against salt spray, mild acids, and bases
Weight: 7 lbs.

All dimensions are in inches [millimeters].
Specifications and features are subject to change without notice.

* See instruction sheet for full list.
  • No longer available-see HS45
  • Auxiliary channel offers separate low frequency outputs (1/4) at no extra charge on each output
  • Marker Pulse Standard
  • Electrically isolated shafts available
  • Optional stub shaft kits for GE motors, 180-6000 Frame
  • Available C-Face tether kits (4.5" to 16")
  • Available threaded rod torque arm
  • Optional OSHA finger guard
Industry General Food & Beverage Pulp & Paper Wood Products Wind Power Crane & Hoist Metals Mining Marine Oil & Gas

Light Mill Duty

AV20, AV25, AV6A, AV6M, Avtron Elevator Encoder, Cables and Connectors, Encoder Couplings, Encoder Programming Tool, HS25A, HS35A, HS6A, K661, 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,

Related Products

Adobe Reader

In This Section

  • A Quad B

    A Quad B refers to the set of output quadrature signals from an incremental quadrature encoder to indicate speed and direction, including complements: A, A NOT, B, B NOT (, , , ). Most Avtron encoders offer A Quad B output at no extra cost.  For more information on quadrature- Wikipedia: http://en.wikipedia.org/wiki/Quadrature_phase

  • Anti-Rotation Arm

    A device used to prevent hollow shaft encoders from spinning with the shaft rotation. It is also called a tether or a torque arm. To prevent encoder bearing damage, anti-rotation arms are very flexible and permit all movements, including axial shaft movement but not rotation.

  • 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.

  • Encoder

    A device which indicates position and speed via a set of digital outputs. Incremental encoders output quadrature (A Quad B) signals, and may add a marker pulse once per revolution.  Absolute encoders typically indicate position via a digital message, a set of parallel outputs, or analog values.

  • Hollow Shaft

    Hollow Shaft encoders mount by passing the shaft of the motor into or through the encoder. Hollow shaft encoders are easy to mount and replace but are vulnerable to damage. Also, the weight of the encoder must be considered for small motor shafts < 0.75" diameter. Avtron offers a full range of hollow shaft encoders, including: AV685, HS25A, HS35A, HS35M, M3, M4, M6, M7, XP45.

  • Industrial EPIC

    The preferred encoder connector of most users in North America. It contains a full size terminal strip and, unlike the MS connector, requires no soldering for quick field connections. Avtron offers pin-for-pin exact replacements for competitors’ models using industrial EPIC® style connectors. EPIC® is a registered trademark of the Lapp Group.

  • IR LED

    Infra-Red Light Emitting Diode is the light source for an optical encoder.

  • Mill Duty

    Mill Duty encoders are sturdier than light mill duty and can withstand more shock, vibration, and bearing loads. Mill duty encoders must be protected from temperature cycling and contaminants.

  • MS Connector

    The most used encoder connector style in North America. Available in 6, 7, and 10 pin versions, with 10 pins being the most common. Avtron offers pin-for-pin exact replacements for competitors’ models using MS connectors. MS connectors are extremely reliable but require soldering. Many users prefer industrial EPIC ® style connectors instead. EPIC® is a registered trademark of the Lapp Group.

  • Optical Encoder

    An Optical Encoder typically uses a light source shining through, or reflecting off, an optical disk with lines or slots that interrupt the beam of light to an optical sensor. Electronics count the interruptions of the beam and generate the encoder’s output pulses.

Contact Avtron

Contact Us