Geometric specifications
ISO GPS specification. ST - Requirements applied to micro and macrogeometry of products

There are four main families of geometric specifications that are defined by the standard. ISO 1101 :

• geometric form specifications;

• geometric orientation specifications;

• geometric position specifications;

• the geometric specifications for flapping.

A geometric specification describes a requirement by defining:

• the toleranced element (the geometric element to be observed);

• the tolerance zone, or more precisely an evaluation element (median element of the tolerance zone in the default case), with or without orientation or position constraints. The tolerance zone is the space of variation...