These tolerances apply to the following types of gears: (a) Spur and helical gears made in accordance with American Standard 20-0eg Involute FinePitch System for Spur and Helical Gears (ASA B6. 7-1956; AGMA 236.04). (b) Straight@ spiral@ * Zerol bevel and hypoid gears. (c)Worms and wormgears with axes at right angles@ comprising cylindrical worms with helical threads and wormgears hobbed for fully conjugate tooth surfaces (not helical gears).