A         Cone/Cup        Bearing I.D., O.D., width or radius could be different from basic part number.
AA      Cone/Cup     Ground O.D., bearing I.D., O.D., width or radius could be different from basic part number.
AB      Cone/Cup     Bearing I.D., O.D., width or radius could be different from basic part number.Flanged cup. (Non-interchangeable.)
AC      Cone/Cup     Bearing I.D., O.D., width or radius  could be different from basic part number. Different internal geometry.
AS      Cone/Cup   Bearing I.D., O.D., width or radius could  be different from basic part number.
AX     Cone/Cup    Bearing I.D., O.D., width or radius could be different from basic part number.
B     Cone     Assembled with brass cage.
B     Cup     Flanged cup. (Non-interchangeable with basic part number.
BA   Cup   Flanged cup. (Non-interchangeable with  basic part number.
BW   Cup    Flanged cup with slot. (Non-interchangeabl with basic part number.)
C    Cone    High capacity cone. Envelope dimensions  same as basic part number. Different internal geometry.
C     Cup       Dimensionally different from basic  part number. (Non-interchangeable.)
D     Cone/Cup     Double cone or double cup. (Non-interchangeable  with basic part number.)
DB    Cone    Double cone assembled with brass cages.
DB    Cup   Double cup with flange. (Non-interchangeable  with basic part number.)
F     Cone    Polymer cage.
H     Cone     Assembled with special cage,   rollers, and/or internal geometry.
J      Cone     Steel cage.
LA    Cone Sealed bearing.
LB     Cone Sealed bearing.
R     Cone/Cup Special features. (Non-interchangeable with basic part number.)
RB    Cup    Snap ring on O.D.
S       Cone/Cup    Special features. (Non-interchangeable with basic part number.)
SD   Cone/Cup Double cone with square I.D. or  double cup.
T    Cone/Cup Tapered I.D. or O.D.
W    Cone/Cup Keyway(s) in cone or cup.
X     Cone/Cup Special features. (Non-interchangeable  with basic part number.)
X    Cone/Cup ISO bearing with same boundry  dimensions. Different internal geometry.
Higher load rating.
XA   Cone/Cup Special features. (Non-interchangeable  with basic part number.)
XB   Cone Different I.D., width or radius from basic part number. Assembled with
brass cage.
XB Cup Special features. Flanged cup.(Non-interchangeable with basic  part number.)
XJA   Cone/Cup ISO bearing, steel cage, centered  on outer ring.
XVB   Cone/Cup ISO bearing, modified external  dimensions.
Y       Cup    Oil holes in O.D.
YK      Assembly Bearing assembly.
Z        Cone/Cup Close stand part.