Basic dimensions

basic dimensions R 1 R 2 h 3 z H 1 a c a c 30° P Nut thread Screw thread H 4 d 2 d 3 d D 1 D 2 D 4
basic dimensions

Values for calculation

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


Clearance on the crest

$\text{if }\ P=1.5$
$\text{else if }\ P\le 5$
$\text{else if }\ P\le 12$

Height of the overlapping

$$H_1=0.5\cdot P$$

Height of internal threads


Height of external threads


Minor diameter for internal threads


Major diameter for internal threads

$$D_4=d+2\cdot a_c$$

Minor diameter for external threads

$$d_3=d-2\cdot h_3$$

Pitch diameter for external threads

$$d_2=d-0.5\cdot P$$

Dimension $ z $

$$z=0.25\cdot P$$

Dimension $ R_{1max} $

$$R_{1max}=0.5\cdot a_c$$

Dimension $ R_{2max} $