Oldham Flexible Couplings


  • Protects driven component by serving as a mechanical “fuse” – an inexpensive replaceable plastic midsection shears under excess load
  • Protects support bearings by exerting consistently low reactive forces, even under large misalignments
  • Homokinetic transmission – driving and driven shafts rotate at exactly the same speed at all times
  • Zero backlash and high torsional stiffness
  • Electrical insulation
  • Accommodates large radial misalignment in a short length
  • Easy installation in blind or difficult installations when through-bores are used
  • Economically priced compared to other couplings with similar performance characteristics
  • Inexpensive replaceable wear element
  • Low moment of inertia


  • Accommodates a relatively small angular misalignment

Typical Applications:

Printing and copying machines; robotics and servo applications

Variations offered by OEP Couplings:

OC Configuration

The classic Oldham coupling

OI Configuration

A higher torque, higher stiffness variation without the mechanical fuse protective function


  • Materials for midsection: Delrin – for general use; low friction, long wear.  High-temperature high-performance thermoplastic; for high-temperature or for more demanding applications.
  • Materials for hub: Alloy 360 brass, alloy 2011 aluminum, and alloy 303 stainless steel
  • Shaft attachment options: Set screw without keyway, set screw with keyway, clamping without keyway, clamping with keyway
  • Torque-limiting option – as detailed in this Case Study, we offer midsections that will break cleanly at a torque specified by the customer, as a replacement for other conventional, more costly torque-limiting devices

Why OEP?

Advantages of OEP Couplings’ Oldham configurations over those of other manufacturers:

  • Higher torsional stiffness, longer service life, and more consistent performance from one coupling to another due to tighter machining tolerances and better surface finishes
  • Higher static break torque and higher peak torque due to small but critical geometrical features, details of fabrication techniques, and the use of advanced materials and processes
  • Higher RPM rating because of dynamic balance inherent in every coupling

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