RS PRO 30mm I.D Taper Metric Roller Bearing, 55mm O.D

The series designations in accordance with
ISO 355 consist of a digit and two letters.
The digit represents the contact angle. The two letters represent the diameter and width series, respectively.
This is followed by a three-digit bore diameter d [mm].
The basic designations of SKF tapered roller bearings start with the letter T, e.g.T2ED 045.