scope:

This Japanese Industrial Standard specifies the tolerance classification of injection-molded plastic cylindrical involute gears (hereafter referred to as gears), the terms and definitions relevant to flank deviations and radial composite deviations of gears, and the flank tolerance classification system and radial composite tolerance classification system of gears.

These tolerances are applicable to the following ranges :

a) normal module (m_n) 0.1 mm or over up to and including 2.0 mm;

b) reference diameter (d) 1 mm or over up to and including 280 mm;

c) number of teeth (z) 3 or more;

d) helix angle (β) 45° or less;

e) facewidth (b) 0.2 mm or over up to and including 40 mm.