BS ISO 1328-2:2020 pdf free.Cylindrical gears - ISO system of flank tolerance classification.Definitions and allowable values of double flank radial composite deviations. BS ISO 1328-2 This document establishes a gear tooth classification system relevant to double flank radial composite deviations of individual cylindrical involute gears and sector gears. It specifies the appropriate definitions of gear tooth deviations, the structure of...