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There are three main types of bearings commonly used in motors: rolling bearings, sliding bearings and oil bearing, which support the rotating parts of motors to rotate. Oily bearings are commonly used in micro or small motors, with fewer accessories and maintenance-free, which is conducive to simplifying the structure. Sliding bearings are mainly used in medium and large motors and are suitable for heavy load and impact-resistant occasions. Rolling bearings are the most widely used. The following topics discussed by Ms. refer mainly to this type of bearings.
How to Identify Bearings
Rolling bearing codes are composed of prefix codes, basic codes and suffix codes. The prefix codes are expressed by letters, meaning a complete set of bearing components; the basic codes represent the main characteristics of bearing types and sizes; and the suffix codes represent the characteristics of bearing accuracy and materials.
Bearing Postposition Code and Its Meaning
Examples of common internal structure code meanings
B-angular contact ball bearing with contact angle of 40 degrees
C-angular contact ball bearing with contact angle of 15 degrees
AC-Angular Contact Ball Bearing with 25 Degree Contact Angle
E-Strengthened Design
Examples of codes and meanings of sealdust proof and external shape change
Code Meaning Code Meaning
N Outer Ring Bearing with Stop Groove (2) RZ Non-contact Sealed Bearing
NR Outer Ring Bearing with Stop Groove and Stop Ring Bearing (2) Z Dust Cap Sealed Bearing
(2) RS contact seal bearing (2) LS contact seal bearing (inner ring without teeth)
Number of cage structure and material
Code Meaning Code Meaning
F steel solid cage, with figures indicating different materials J steel sheet stamping cage
Q bronze solid cage, with figures indicating different materials V full rollers
M brass solid cage E phosphating treatment cage
T-phenolic laminated pipe solid cage D carbonitriding cage
TN engineering plastic injection cage
Tolerance grade code
P 0-Dimensional Accuracy of P0 Level
P6 - Dimensional accuracy P6
P5 - Dimensional Accuracy P5
P4 - Dimensional Accuracy P4
P2-Dimension Accuracy Level P2
The accuracy of rolling bearings is improved in turn from grade 0.


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