GB/T 45683-2025

This standard defines the principles and rules for specifying general geometrical tolerances and general size specifications within the Geometrical Product Specifications (GPS) framework. It is applied in mechanical engineering and manufacturing industries to control the permissible variation in the form, orientation, location, and size of product features without requiring individual tolerance indications on drawings. The standard is used during design, production, and quality inspection to ensure consistent interpretation of default tolerances for features like holes, shafts, and planar surfaces.