Tooth proportions for fine-pitch gearing are similar to those of coarse pitch gearing except in the matter of clear-
ance. For 20 degree profile angle fine-pitch gearing, this standard provides a system of enlarged pinions which
use the involute form above 5 degrees of roll. Data on 14- 1/2 and 25 degree profile angle systems , as well as a
discussion of enlargement and tooth thickness are included in the annexes.
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