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This standard establishes the calculation procedures for determining specification limits for external and internal cylindrical involute gearing with constant gear ratio when the desired tooth thickness is known. This standard also shows the relationships between backlash and the tooth thickness, centre distance, and tooth deviations in a pinion and gear mesh. This standard applies to the following types of gears: external and internal parallel axis cylindrical involute spur and helical gears; involute worms and crossed-axis helical gears; spur and helical racks; and involute spur and helical sector gears The formulae in this standard apply to gears of all sizes and materials, and to all manufacturing methods. This document does not provide guidance on selecting the tooth thickness or the tolerance on the thickness.