ISO 677:1976 Preview
Straight bevel gears for general engineering and heavy engineering -- Basic rack
This standard was last reviewed and confirmed* in 2015.
*Therefore this version remains current
Specifies the dimensional characteristics of the basic rack, having a constant bottom clearance. In these gear pairs the tip angle of one gear is equal to the difference between the designed shaft angle and the root angle of the mating gear. Gives profile and some notes and defines the terms basic rack and reference line.