A comprehensive engineers' reference source for radial ball bearings and thrust ball bearing



           Ball bearing failure
              Ball bearing overview
              Ball bearing bore
              Ball Bearing failure modes
              Ball Bearing Fatigue life
              Ball Bearing Load ratings
              Bearing handling
              Bearing Misalignment
              Ball Bearing Mounting and fitting

              Ball bearing wear


The retainer, also referred to as the cage or separator, is used to separate and position the balls at equal intervals around the bearing raceways. Retainers are available in two standard types, according to the size and design of the bearing itself. The most common is a 2-piece closed ball pocket design known as a ribbon retainer. The crown retainer is a single piece open ball pocket design. For most bearing sizes, the retainer type is as shown in the individual bearing tables, and cannot be specified by the user. However, for special applications, please contact a Dynaroll engineer to discuss retainer options.

J TYPE RIBBON RETAINER The closed pocket design of the ribbon retainer is the most common type. The material used is 300 series stainless steel. For low torque applications, a loose clinched ribbon retainer may be available.  
W TYPE CROWN RETAINER The standard metal crown retainer is very light weight, with specially coined ball pockets to reduce torque and provide smooth running characteristics. Material used is 400 series stainless steel.

T12 TYPE CROWN RETAINER Plastic crown retainers have the highest speed ratings of any standard retainer type, but have limited availability.


RETAINER MATERIAL Retainer materials other than the standard 300/400 series stainless steel or plastic are available for specific applications. Please contact Dynaroll concerning availability and compatibility of different retainer types.

Bearing Overview
|| Materials || Cages and Retainers || Shields and Seals || Bearing Geometry || Abec Tolerance
Lubrication || Load Rating and Lifetime || Bearing Failure || Noise || Torque || Mounting and Fitting
Preload || Bearing Handling || Adhesive Practices || Assembly Characteristics || Specify a Bearing
Ball Bearing News || Site Map

Dynaroll Copyright 2005