NSK water pump bearing numbering system, nomenclature

The NSK water pump bearing numbering system is outlined above drawing. As we all know, NSK bearing numbers are alphanumeric combinations that indicate the NSK bearing type, boundary dimensions, dimensional and running accuracies, internal clearance, and other related specifications. please refer to NSK bearing nomenclature.

NSK water pump nomenclature

Type symbol

RWF: Ball Roller type water pump bearing

BWF: Ball ball type water pump bearing

Design of chamfer

No symbol: Standard chamfer

a: special chamfer

Front seal symbol

R, R1, R2, ...

Rear seal symbol

This symbol is omitted when rear seals and front seals are the same.

Material symbol

No symbol: bearing steel (SUJ2)

g3: Carburized steel (Shaft only)