Spring Mean Coil Diameter

formulas that use Spring Mean Coil Diameter

\(\large{ D = D_o - d  }\)
\(\large{ D = D_i + d  }\)

Where:

\(\large{ D }\) = mean coil diameter

\(\large{ D_i }\) = inner diameter

\(\large{ D_o }\) = outer diameter

\(\large{ d }\) = wire diameter

Solve for:

\(\large{ D_i = D_o - 2 \; d  }\)

\(\large{ D_o = D_i + 2 \; d  }\)