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Home ... Engineering Information... Miniature & Small ball bearings... Selecting a Bearing... 5. Retainer

Miniature & Small ball bearings -5. Retainer

Retainers keep the balls separated and equally spaced. Although there is a standard type retainer for each part number, occasionally retainers are selected based on the required performance.


■Ribbon retainer

It is composed of two press molded steel parts. The balls are held between the two steel parts, and the tabs of one of the steel parts are bent over the second steel part to unite them together. This is the most common type.

■Crown retainer

It is composed of a press molded steel part. The small difference in inner and outer diameters of the retainer allows them to be used for thin type and very small ball bearings.

■Plastic retainer

It is composed of a molded and cut plastic part. The plastics include Polyamide, Polyacetal, and so on. It is used for high speed rotation and low noise level.

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Home ... Engineering Information... Miniature & Small ball bearings... Selecting a Bearing... 5. Retainer