Mounting Methods (Part 3 of 4): The Concentric Clamp Collar

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

concentric clamp collar 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

concentric locking collar close up.png

Let’s examine the third option: PTI’s “CL” Series Concentric Clamp Collar mounted bearings use a black oxide coated collar and a slotted inner ring. When tightened, “CL” series units are concentrically locked in place without marring the shaft, allowing for reduced vibration.


concentric contact points.jpg

  • Easy to Install
  • Minimal Shaft Damage
  • Concentric Grip to the Shaft
  • Provides a More Balanced Effect Ideal for Medium to High Speeds

*Note: this mounting method is helpful to minimize vibration.

Starts at 04:15

  • Once the bearing is on the shaft, tighten the collar using an Allen wrench or torque wrench (to ensure locking torque is ideal – see Chart 4 below from our Mounted Ball Bearing Installation Manual)
  • Re-check tightness of the collar 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: Setscrew Locking, Part Two: The Eccentric Locking 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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