scope:

This Standard specifies the characteristics of the standard basic rack tooth profile for cylindrical involute gears (external or internal) for general and heavy engineering.

This Standard applies to the standardized modules specified in JIS B 1701-2.

The defined profile does not take into account the possible cut-off of the height of internal teeth. This height is to be calculated for each case.

The standard basic rack tooth profile defined in this Standard constitutes a geometrical reference for a system of involute gears in order to fix the sizes of their teeth. It does not constitute a definition of a cutter, but a cutter should be defined from this standard basic rack tooth profile in order to realize a conforming profile.

NOTE: The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows:

ISO 53: 1998 Cylindrical gears for general and heavy engineering-Standard basic rack tooth profile (IDT)

The symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/ lEC Guide 21-1.