The principle usually followed by the naming rules of angular contact bearings

The model number typically consists of numbers and letters, indicating the type and size of the bearing. Common numbers like “72”, “73”, and “70” represent different types and sizes of bearings, with the number “7” indicating an angular contact ball bearing. Following the model number is a series of numbers that indicate the inner diameter, outer diameter, and width of the bearing, usually in millimeters. For example, “30x62x16” indicates an inner diameter of 30 mm, an outer diameter of 62 mm, and a width of 16 mm.

The name usually includes information about the contact angle. The contact angle refers to the angle between the rolling elements of the bearing and the inner and outer rings. For angular contact bearings, the typical contact angles are 15 degrees, 25 degrees, and 40 degrees, represented by the letters C, A (or A5, used by specific brands like NSK), and B. High-precision and high-speed bearings typically use a 15-degree contact angle. The larger the contact angle, the higher the axial load capacity.

The name may also include some suffixes to indicate the bearing’s seal, lubrication and other special designs. For example, “U” means the bearing has a metal cover, “DU” means the bearing has a rubber cover, “X” means the bearing uses special grease, etc.

In general, the naming rules for angular contact bearings cover type and size, diameter and width, angular contact Angle, and suffix information that helps users quickly and accurately select and identify the appropriate angular contact bearing.