Inside the flinger is a steel trash guard with a rubber lip seal. The flinger protects the lip seal from being prematurely damaged. This feature permits the bearing to swivel easily in the housing to account for misalignment during assembly and operation. An antirotation pin is included to prevent the bearing outer ring from rotating within the housing. Another benefit of the unit is that a special air-handling grease protects the bearing's internal components.
Some bearings have a narrower set-screw spacing.
The SKF unit's wider spacing gives less distortion on the inner ring when bearing set screws are tightened down, which extends service life and reduces vibration during operation. The ability to account for misalignment and low distortion on the inner ring diminishes the noise. This arrangement lessens inner-ring distortion during operation, reducing bearing vibration, lowering fatigue, and increasing service life. Sorting Ceramic Insulators Ceramic insulators from Johanson Manufacturing Corp. in Boonton, N.J., are used in arc capacitors, variable capacitors, and surge arresters on telephone lines. These insulators, which come to the New Jersey facility from Johanson's division in Switzerland, receive a glaze to improve resistivity, make them easier to clean, and render them waterproof.