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Basic dimensions

basic dimensions D 1 , d 1 D 2 , d 2 D , d d 3 P H
basic dimensions

Values for calculation

$ D $ $ \mathrm{mm} $
$ d $ $ \mathrm{mm} $
$ P $ $ \mathrm{mm} $

Calculation

Height of fundamental triangle

$$H=\cfrac{\sqrt{3}}{2}\cdot P$$

Basic pitch diameter of internal thread

$$D_2=D-2\cdot\cfrac{3}{8}\cdot H$$

Basic pitch diameter of external thread

$$d_2=d-2\cdot\cfrac{3}{8}\cdot H$$

Basic minor diameter of internal thread

$$D_1=D-2\cdot\cfrac{5}{8}\cdot H$$

Basic minor diameter of external thread

$$d_1=d-2\cdot\cfrac{5}{8}\cdot H$$

Basic smaller diameter of external thread

$$d_3=d_1-\cfrac{H}{6}$$