Double Row Spherical Roller Bearing

designs and structures
ctn1: nylon retainer.
c: stamped steel retainer and strengthened symmetric rollers; offers considerably higher load ratings than conventional designs for a broad range of applications and long service life.
ca: alternative design of c design; precision-machined one-piece brass retainer and strengthened symmetric rollers; used to exchange with c design, especially for large size.
mb: two-piece precision-machined brass retainer and strengthened symmetric rollers; equivalent to c design in load capacity.
cc: steel cage, replace traditionalbrass cage.
e: third generation design.
the bearing contact is completely optimized and has improved stress distribution; offer much longer service life than normal designs.
variations of exterior shape of inner & outer ring
k: tapered bore with taper of 1:12.
n: locking groove on the outside ring.
k30: tapered bore with taper of 1:30.
w33: there are lubricating groove and three lubricating holes on the outside ring for fitting together with the body structure so as to realize the bearing lubrication from outside.
clearance
c2: less than nominal clearance.
c0: nominal clearance, omitted in designation.
c3: larger clearance than c0.
c4: larger clearance than c3.
c5: larger clearance than c4.