scope:

This standard applies to spur and helical gearing of 20 through 120 diametral pitch and coarser is found in ANSI B6.1-1968, "Tooth Proportions for Coarse-Pitch In volute Spur Gears."(AGMA 201.02).

The tooth proportions shown herein will be suitable for many gear designs of finer than 120 diameter pitch, however, such designs should be checked for suitability, particularly in the areas of contact ratio, undercutting and clearance.

Information on tooth proportions for spur and helical gearing of 20 degree pressure angle and having 7 or more teeth is given the main body of this standard.

Gear Design with low numbers of teeth should be checked for suitability, particularly in the areas of contact ratio, undercutting and clearance.