This document specifies the geometry of bevel gears. The term bevel gears is used to mean straight@ spiral@ zerol bevel and hypoid gear designs. If the text pertains to one or more@ but not all@ of these@ the specific forms are identified. The manufacturing process of forming the desired tooth form is not intended to imply any specific process@ but rather to be general in nature and applicable to all methods of manufacture. The geometry for the calculation of factors used in bevel gear rating@ such as ISO 10300 (all parts)@ is also included. This document is intended for use by an experienced gear designer capable of selecting reasonable values for the factors based on his/her knowledge and background. It is not intended for use by the engineering public at large. Annex A provides a structure for the calculation of the methods provided in this document.