GB/T 321-1980
AbolishedPreferred numbers and preferred number series
优先数和优先数系
Application Summary AI generated
This standard defines a system of preferred numbers and their series, based on geometric progressions, to be used as a unified basis for selecting product parameters and dimensions. It is applied across all Chinese industries, including mechanical, electrical, and civil engineering, to rationalize product specifications, reduce variety, and facilitate interchangeability and modular design. The standard ensures consistency in parameter selection for components like screw threads, bearing sizes, and electrical ratings during design and manufacturing.
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Transparency note: The application summary and key sentences on this page were automatically generated by AI from the standard's original text. This content has not been human-verified and should not be used for compliance or regulatory purposes. Always refer to the official standard document from the issuing authority.