Menu

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

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

Calculation

Clearance on the crest

$\text{if }\ P=1.5$
$\text{if }\ P=1.5$
Equations in LaTeX code
\text{if }\ P=1.5
$$a_c=0.15$$
$a_c=0.15$
Equations in LaTeX code
a_c=0.15
$\text{else if }\ P\le 5$
$\text{else if }\ P\le 5$
Equations in LaTeX code
\text{else if }\ P\le 5
$$a_c=0.25$$
$a_c=0.25$
Equations in LaTeX code
a_c=0.25
$\text{else if }\ P\le 12$
$\text{else if }\ P\le 12$
Equations in LaTeX code
\text{else if }\ P\le 12
$$a_c=0.5$$
$a_c=0.5$
Equations in LaTeX code
a_c=0.5
$\text{else}$
$\text{else}$
Equations in LaTeX code
\text{else}
$$a_c=1$$
$a_c=1$
Equations in LaTeX code
a_c=1

Height of the overlapping

$$H_1=0.5\cdot P$$
$H_1=0.5\cdot P$
Equations in LaTeX code
H_1=0.5\cdot P

Height of internal threads

$$H_4=H_1+a_c$$
$H_4=H_1+a_c$
Equations in LaTeX code
H_4=H_1+a_c

Height of external threads

$$h_3=H_1+a_c$$
$h_3=H_1+a_c$
Equations in LaTeX code
h_3=H_1+a_c

Minor diameter for internal threads

$$D_1=d-P$$
$D_1=d-P$
Equations in LaTeX code
D_1=d-P

Major diameter for internal threads

$$D_4=d+2\cdot a_c$$
$D_4=d+2\cdot a_c$
Equations in LaTeX code
D_4=d+2\cdot a_c

Minor diameter for external threads

$$d_3=d-2\cdot h_3$$
$d_3=d-2\cdot h_3$
Equations in LaTeX code
d_3=d-2\cdot h_3

Pitch diameter for external threads

$$d_2=d-0.5\cdot P$$
$d_2=d-0.5\cdot P$
Equations in LaTeX code
d_2=d-0.5\cdot P

Dimension $ z $

$$z=0.25\cdot P$$
$z=0.25\cdot P$
Equations in LaTeX code
z=0.25\cdot P

Dimension $ R_{1max} $

$$R_{1max}=0.5\cdot a_c$$
$R_{1max}=0.5\cdot a_c$
Equations in LaTeX code
R_{1max}=0.5\cdot a_c

Dimension $ R_{2max} $

$$R_{2max}=a_c$$
$R_{2max}=a_c$
Equations in LaTeX code
R_{2max}=a_c
On this page