The designations of metric tapered roller bearings follow one of the following principles
- 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.
- Designations established prior to 1977 are based on the system shown under Basic designations, e.g. 32206 (table 1).