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Quick Overview

Helical Flexible Coupling
for stepper and servo motors
with 6.35mm or 0.25" shaft diameter


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  • CPF-22X25-635


Helical Flexible Coupling (coupler).
General purpose with light to medium duty.
This is economical and maintenance free coupling for variety of applications.
It is 7/8 dia x 1" lg w/ 1/4 bore in each end.
Black Anodized aluminum.
Attachment via two set screws for each side. Fits most NEMA 23 motor shafts.
The flexible beam corrects for a slight misalignment between the mating shafts, reducing wear and tear on bearings.
Also may help to dampen stepper motor resonance.
Strongly recommended for attaching an encoder shaft to a motor.
This is a clamp style coupler and does not require a flatted shaft. The clamp style fit is more effective than a set screw as it will not marr the motor shaft.
Works on round or D-flatted shafts.
Clamp screw takes a 3/32 Hex (Allen) wrench.

Technical Data:

  • Outer diameter:ø 7/8" (0.875")
  • Length: 1"
  • Inside diameter: 1/4" (0.25")
  • Suitable axis diameter:ø6.35mm ø0.25"
  • Driving moment: 2 N-m
  • Radial tolerance:0.2mm
  • Axial tolerance:+0.2mm
  • Angle tolerance:2°
  • Max.RPM:20000rpm
  • Material: LY12

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