We can produce the diameter from 20mm~1800mm spherical roller bearings. 25mm~220mm sealed spherical roller bearings etc. Following is the internal structure of different product descriptions.

C2 Radial internal clearance smaller than Normal
C3 Radial internal clearance greater than Normal
C4 Radial internal clearance greater than C3
C5 Radial internal clearance greater than C4
CC Two window-type steel cages, flangeless inner ring and guide ring centre on the inner ring.
CAME4 Machined brass cage, Out ring with lubrication holes and groove.
2CS Sheet steel reinforced contact seal of acrylonitrile-butadiene rubber (NBR) on both sides of the bearing. Annular groove and three lubrication holes in the outer ring covered with a polymer band. Lubricated with an extreme pressure bearing grease according to the table
2CS2 Sheet steel reinforced contact seal of rubber (FKM) on both sides of the bearing. Annular groove and three lubrication holes in the outer ring; Covered with a polymer band. Lubricated with a polyurea high-temperature grease
2CS5 Sheet steel reinforced contact seal of hydrogenated acrylonitrile-butadiene rubber (HNBR) on both sides of the bearing. Otherwise as 2CS2
E/A Enhanced design.
EAE4 Enhanced design press steel cage, Out ring with lubrication holes and groove.

M Machined brass cage, ball centred.
MA Machined brass cage, outer ring centred.
MB Machined brass cage, inner ring centred.
HA3 Case-hardened inner ring
K Tapered bore, taper 1: 12
K30 Tapered bore, taper 1: 30
S With an groove, lubrication holes in out rings.
P5 Dimensional and running accuracy to ISO tolerance class 5
P6 Dimensional and running accuracy to ISO tolerance class 6
VA405 Bearings for vibratory applications with surface hardened cages
VA406 VA405 and PTFE-coated bore
VE552(E) Outer ring with three equally spaced threaded holes in one side face to accommodate hoisting tackle; The E indicates that appropriate eye bolts are supplied with the bearings
VE553(E) As VE552 but with threaded holes in both side faces
VG114 Surface hardened pressed steel cage
VQ424 Running accuracy better than C08
VT143 Grease fill with an extreme pressure grease according to the table
W Without annular groove and lubrication holes in outer ring
W20 Three lubrication holes in outer ring
W26 Six lubrication holes in inner ring
W33 Annular groove and three lubrication holes in outer ring
W77 Plugged W33 lubrication holes