1 Subject Content and Application Scope
This standard specifies the basic principle and requirements for the selection of shaft and housing fits for rolling bearings (hereinafter referred to as "bearings") under general operating conditions.
Note: It refers to the installation condition of the host without special requirements for running accuracy, operation smoothness, operating temperature, etc.
The fits specified in this standard are applicable to the following conditions:
a. The boundary dimensions of the bearings comply with GB 273.1 "Rolling Bearings-Tapered Roller Bearing-Plan of Boundary Dimensions", GB 273.2 "Rolling Bearings-Thrust Bearings-Plan of Boundary Dimensions" and GB 273.3 "Rolling Bearings-Radial Bearings-Plan of Boundary Dimensions", and their nominal inside diameter d≤500mm and nominal outside diameter D≤500mm;
b. The tolerances of the bearings comply with G and E(Ex) in GB 307.1 "Rolling Bearings-Tolerances";
c. The clearances of bearings comply with Group 0 in GB 4604 "Rolling Bearings-Radial Internal Clearance";
d. The shafts are solid or made of thick-walled steel;
e. The housings are made of cast steel or cast iron.
This standard is not applicable to the bearings without inner (outer) ring or the bearings for special purpose (such as airframe bearings and instrument bearings).
