Spring Mean Coil Diameter

Written by Jerry Ratzlaff on . Posted in Fastener

Spring Mean Coil Diameter formulas

$$\large{ D = D_o - d }$$

$$\large{ D = D_i + d }$$

Symbol English Metric
$$\large{ D }$$ = mean coil diameter $$\large{ in}$$ $$\large{ mm }$$
$$\large{ D_i }$$ = inner diameter $$\large{ in}$$ $$\large{ mm }$$
$$\large{ D_o }$$ = outer diameter $$\large{ in}$$ $$\large{ mm }$$
$$\large{ d }$$ = wire diameter $$\large{ in}$$ $$\large{ mm }$$

Tags: Spring Equations