GB/T 4772.2-1999

This standard specifies the mounting dimensions, shaft extension dimensions, and output power ratings for rotating electrical machines with frame numbers 355 to 1000 and flange numbers 1180 to 2360. It is applied in the design, manufacturing, and procurement of large industrial motors and generators, ensuring mechanical interchangeability and compatibility with driven equipment such as pumps, compressors, and conveyors. The standard is critical for heavy machinery applications in industries like power generation, mining, and large-scale manufacturing where standardized motor mounting and output characteristics are required.