This standard contains the ISO system of accuracy relevant to corresponding flanks of individual cylindrical
involute gears. It provides definitions for gear tooth accuracy terms, the structure of the gear accuracy system
and the allowable values of pitch, profile and helix deviations. A normative annex for tangential composite toler-
ances and an informative annex for allowable values of profile form, profile slope, helix form and helix slope
deviations are provided.