Spring Mean Coil Diameter

Written by Jerry Ratzlaff on . Posted in Fastener

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 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 \(\large{  in}\) \(\large{ mm }\)

 

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Tags: Spring Equations