GB/T 304.3-2023 Active

This document specifies the fitting principles between the bearing (hereinafter referred to as "bearing") and the shaft and bearing seat hole under normal working conditions, as well as the selection principles for threaded connections, recommended tolerance zones, geometric tolerances and surface roughness of the shaft and bearing seat hole. This document applies to bearing fitting design in the following situations: -- The bearing outer dimensions comply with the provisions of GB/T 9161-2001 (except for the K series), GB/T 9162-2001, GB/T 9163-2001 (except for the K and W series), and GB/T 9164-2001, and the bearing nominal inner diameter d ≤ 1,250 mm, nominal outer diameter D ≤ 2,000 mm; -- The bearing radial clearance complies with Group N specified in GB/T 9161-2001 and GB/T 9163-2001; -- The fitting shaft is a solid shaft or a thick-walled hollow shaft; -- The working temperature does not exceed 100℃.