TB 118: A Comparison of Size 25 Encoders

Size 25 shaft encoders (2.5” diameter), along with their size 58 (58mm diameter) European equivalents, are among the most widely used encoders in the world.  As a result, nearly every encoder manufacturer makes them.  That being the case, are there any compelling reasons to choose one over the other?

  • Optical technology for high accuracy
  • Resolutions from 1 to 65,536 CPR (262,144 quadrature counts)
  • Servo and flange mounting
  • IP67 sealing available


This technical bulletin identifies and compares important features of Size 25 shaft encoders, including what we consider typical designs, and the EPC Models 725N and 725I.

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