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Cross-sectional area of the bolts

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

Values for calculation

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

Calculation

Height of fundamental triangle

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

Basic pitch diameter of external thread

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

Basic minor diameter of external thread

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

Basic smaller diameter of external thread

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

Cross‐sectional area of the bolts

$$A_b=\cfrac{π\cdot\left(d_2+d_3\right)^2}{16}$$