GB/T 1800.1-2020 Geometrical product specifications (GPS)—ISO code system for tolerances on linear sizes—Part 1:Basis of tolerances, deviations and fits

Scope

This part of GB/T 1800 establishes an ISO code system for linear dimensional tolerances, which applies to the following types of dimensional elements:
a) cylindrical surfaces;
b) two relatively parallel surfaces.
This part defines the basic concepts and related terms of the ISO code system for linear dimensional tolerances, and provides a standardized method for selecting commonly used tolerance zone codes from a variety of options.
In addition, this part defines the basic terms for the fit of two dimensional elements that are not subject to direction and position constraints, and explains the principles of "reference hole" and "reference axis".

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