Designations of Oil Seals

A = BA = CB = SC = Rubberized single lip with spring

AS = BASL = CC = TC = Same as above but with dust lip on the outside

B = B1 = BB = SB = Sheet metal external single lip with spring

BS = B1SL = BC = TB = Same as above but with dust lip on outside

C = B2 = DB = SA = Sheet metal outside with sheet metal inside single lip with spring

CS = B2SL = DC = TA = Same as above but with dust lip on the outside

ASP = BABSL = CCP = TCP = Same as AS but pressure resistant 10 bar

AOF = BAOF = CD = VC = Same as A but without spring

BOF = B1OF = BD = VB = Same as B but without spring

ADUO = BADUO = CK = DC = Same as A but with spring loaded lip on both sides
BDUO = B1DUO = BK = DB = Same as B but with spring-loaded lip on both sides

Interpretation of above: DIN standard = Simrit = Stefa = Asia

CC4 = TC4 = Front fork seal with double sealing rings and dust lip