Bearing designations in metric dimensions:
Series numbers are: 302, 303, 313, 320, 322, 323, 329, 330 ...
Exemplary designation of a tapered roller bearing in metric dimensions: 31305.A

Designation of bearings in inch dimensions:
Inch bearings contain the letter designation of the load class:
EL (extremely light), LL (less than light), L (light), LM (light to medium), M (medium), HM (medium heavy), H (heavy), HH (more than heavy), EH ( extremely heavy), T (only axial).
Sample designation of a tapered roller bearing in inch dimensions: HM 88547/1.

Single row tapered roller bearings are the basic and most common type of tapered roller bearing. It consists of two separable base parts: the inner assembly and the outer ring. A single row tapered roller bearing is usually a paired bearing, as one of a pair of oppositely mounted, identical tapered roller bearings. In order to optimize the performance, single row tapered roller bearings are adjusted during assembly to the required clearance or preload.

Double row tapered roller bearings consist of a double outer ring and two single inner units. They are often supplied as preset units with a spacer ring between the inner rings. A double-row tapered bearing can carry heavy loads, including combined radial and axial loads. These bearings can locate the shaft axially in both directions with a defined axial play or preload. This assembly has a wide active bearing spacing and is selected for high tipping moment applications.