what is the meaning of code number which is given on
bearing.

Answer Posted / m c a nair

OK; the first answer given is almost right. But to be more clarifying

Say the bearing code given is 6301Z

6 denotes the type of bearing : Deep groove ball bearing
3 stands for the size of the bearing, say OD and width of bearing
01 (last 2 digits) stands for the bore of the bearing ie 12 mm bore
00 - 10 mm bore
01- 12 mm bore
02- 15 mm bore
03- 17 mm bore
from 04 - 04 x 5= 20 mm bore
05- 05 x 5= 25 mm bore
Z stands for metallic shield
if 2z means both side shielded

If the bearing number given is 23215 C3?

2 stands for spherical roller bearing;
3 and 2 stands for the size of the bearing(Bearing construction details)
15 last 2 digits stands for the bore of the bearing say 15 x 5= 75 mm bore
C3 stands for the internal clearance of the bearing, which is more than normal internal clearance) C1, C2, normal, C3 C4 etc
If not mentioned it is normal clearance

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