Mounting Methods (Part 2 of 4): Eccentric Locking Collar

(This is the second of a four-part series examining the Four Shaft Attachment Methods for Mounted Ball Bearings…)

eccentric locking image.jpg

PTI offers all four (4) shaft locking mechanisms for mounted (aka “housed”) ball bearings:

  1. Setscrew Locking
  2. Eccentric Locking Collar
  3. Concentric Clamp Collar
  4. Tapered Adapter Sleeve

eccentric closeup image for blog.png

Let’s examine the second option: The Eccentric Locking Collar is a very popular locking mechanism for securing a mounted bearing to the shaft, second only to the Setscrew Locking method. Read on to learn more…


eccentric contact points -updated Darin.jpg

  • Easy to Install
  • Relatively Low Market Price
  • Uni-directional
  • Minor Shaft Damage
  • Low to Medium Speeds

*Note: this shaft attachment method is unidirectional and NOT intended for reversing loads. Eccentric locking collar mounted bearings contact the shaft over a larger surface area compared to setscrew mounted bearings. This can reduce shaft damage and fretting corrosion.

Starts at 03:10

  • Slide the eccentric collar against the mating end of the insert inner race.
  • Snug the collar on the mating eccentric in the direction of shaft rotation.
  • Place a mild steel bar inside the hole provided by the collar and tap the collar sharply in the direction of shaft rotation and perpendicular to the shaft.
  • Tighten the setscrew in the collar to the proper torque (from our Mounted Ball Bearing Installation Manual).
  • To remove the bearing, loosen the setscrew, then tap the collar in the direction opposite the shaft rotation.
  • Re-check tightness of the setscrew and hold down bolts after 24 hours of operation to insure nothing has loosened. This check should become part of periodic maintenance including re-lube intervals.

setscrew locking chart 4.PNG


  • Wrenches or drivers should be kept in good condition (flats not rounded over) to prevent damage to the set screws and to allow proper tightening.
  • Set screws can be replaced to maintain holding power without replacing the entire bearing.
  • L10 Life = the expected life of the bearing under normal conditions. Factors affecting bearing life include temperature, ambient conditions (presence of moisture, dust, dirt and other contaminants) and lubrication/maintenance practices.
  • PTI has the product, engineers, and experience to help you choose the ideal mounting method for your application.


Click here to access Part One: The Setscrew Locking, Part Three: The Concentric Clamp Collar and Part Four: The Tapered Adapter Sleeve.

 * * *

About PTI: Upon opening in 1994, PTI has specialized in serving the growing niche market of Metric products. As demand has increased over the years, so has our product offering. Today, our customers enjoy a huge offering of both Metric and Inch-based products for the Industrial Power Transmission Industry.

Want to learn more about PTI? Click here to view our company overview video. Check out other videos, information and more at

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