Maximum Speed

A number of factors affect speed limitation such as temperature, load, vibration, radial play, retainer, lubricant, ball material and closures. The speeds quoted in our catalogue pages are only approximate and valid for bearings used on a horizontal shaft with a metal cage, standard tolerance grade and radial play, medium loading, rotating inner ring and suitable lubricant (see below). Vertical shaft applications will necessitate a reduction of approximately 20 percent. Temperature excesses and heavy loadings will also require slower speeds. Bearings fitted with contact seals cannot achieve the same speeds due to increased friction between seal lip and bearing inner ring. The choice of lubricant may also have a significant effect on the speed rating. The maximum speed (rpm) at which a lubricant can effectively operate varies from type to type. The following adjustment factors are approximate and are based on bearings with a metal crown or ribbon cage. The maximum speed of a bearing can be increased by the use of a delrin or phenolic cage provided a suitable lubricant is used. The use of ceramic balls will increase bearing speed by up to 30 percent.

Speed reduction Table

 

Lubrication Types

Rotating Inner ring
Rotating outer ring
Open/ZZ
2RS
Open/ZZ
2RS
Petroleum oil Nil reduction 40% reduction 20% reduction 40% reduction
Synthetic oil Nil reduction 40% reduction 20% reduction 40% reduction
Silicon oil 20% reduction 40% reduction 30% reduction 40% reduction
Standard grease Nil reduction 40% reduction 40% reduction 40% reduction
High speed grease Nil reduction 40% reduction 20% reduction 40% reduction
Silicon grease 20% reduction 40% reduction 30% reduction 40% reduction