Home > En > NSK - Bearing handbook > Formulation of bearing number
Basic numbers Auxiliary symbols
Contact angle symbols
Symbol Meaning
(Angular Contact Ball Bearings)
A Standard contact angle of 30
A5 Standard contact angle of 25
B Standard contact angle of 40
C Standard contact angle of 15
(Tapered Roller Bearings)
Omitted Contact angle, less than 17
C Contact angle, about 20
D Contact angle, about 28

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