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Avtron HS25A Encoders

Avtron HS25A Encoders easily fit shafts from 3/8" to 3/4", using a durable shaft insert. Units may be resized by replacing or removing the insert, enabling our factory, distributors, and customer stockrooms to swiftly meet any need. The shaft insert (3/8" to 5/8") also provides isolation from motor shaft currents, while permitting case grounding to meet NEC requirements. For larger shaft sizes (up to 1 1/8"), select HS35A or HS35M. For shaft sizes up to 2 3/8", select M3-(3-9, A-J), or step up to the Heavy Mill Duty, M4-(3-9, A-J) magnetic encoder.

Basket Guard for encoder HS25A Encoder with shaft insert HS25A hollow shaft encoder shown with shaft insert and optional basket guard.
HS25A

Hollow Shaft Mount
3/8" - 3/4"
[6mm-16mm]

Light Mill Duty

Optical Encoder

PPR: 1 - 3600**

-20°C to +100°C

Tough and Compact!

  • Shatterproof optical disk
  • Wide-Gap Technology: Up to 8X larger gap between optical sensor and optical disk
  • Replaces Competitive Models without Rewiring
  • Fits end-of-shaft applications
  • IP65/NEMA 4 Rating: Dust and Liquid Tight
  • 2 Year No-Hassle Warranty

More Advantages!

  • Innovative shaft ring retains collar during installation
  • Advanced optical sensor technology
  • Superior seals and bearings with synthetic lubricant for longer life
  • No extra charge for signal complements and marker pulse (, , , , , )
  • Optional basket guard adds even more protection

  • **Models up to 8192 PPR via special order

  • Optional anti-rotation arm

*Sales Bulletin
*Instruction Sheet
*Basket Guard
*Tether
Declaration of Conformity (CE)
*Installation Guide - HS25A, HS35A, HS35M - Global
**HS25A/HS35A Installation Video (24.8 MB)*
**HS25A/HS35A Removal Video (7.6 MB)*

Most models available in 3-5 days!
Request same-day shipment!


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