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Spring Wire Length

 

Compression Spring Wire Length formulas

\( L_c \;=\;  \pi \cdot D \)    (one coil wire length)

\( L_t \;=\;  L_c \cdot n_t \)     (total wire length)
Symbol English Metric
\( L_c \) = coil wire length \( in \) \( mm \)
\( L_t \) = total wire length \( in \) \( mm \)
\( \pi \) = Pi  \(3.141 592 653 ...\)  \(3.141 592 653 ...\)
\( D \) = mean coil diameter \( in \) \( mm \)
\( n_t \) = total number of coils \(dimensionless\) \(dimensionless\)

spring dimensions 1Spring wire length, abbreviated as \(L_c\) and \(L_t\), is the wire used to make a coil spring and is based on the number of coils, the mean coil diameter, and the pitch of the coils.   

Extension Spring Wire Length formulas

\( L_c \;=\;  \pi \cdot D \)    (one coil wire length)

\( L_t \;=\;  L_c \cdot ( n_t + 2 \cdot h ) \)     (total wire length)
Symbol English Metric
\( L_c \) = coil wire length \( in \) \( mm \)
\( L_t \) = total wire length \( in \) \( mm \)
\( \pi \) = Pi \(3.141 592 653 ...\)  \(3.141 592 653 ...\)
\( D \) = mean coil diameter \( in \) \( mm \)
\( n_t \) = total number of coils \(dimensionless\) \(dimensionless\)
\( h \) = height of 2 coils (hooks) \( in \) \( mm \)

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Extension Spring Wire Length formulas

\( L_c \;=\;  \pi \cdot D \)    (one coil wire length)

\( L_t \;=\;  L_c \cdot ( n_t + 2 \cdot h ) \)     (total wire length)
Symbol English Metric
\( L_c \) = coil wire length \( in \) \( mm \)
\( L_t \) = total wire length \( in \) \( mm \)
\( \pi \) = Pi \(3.141 592 653 ...\)  \(3.141 592 653 ...\)
\( D \) = mean coil diameter \( in \) \( mm \)
\( n_t \) = total number of coils \(dimensionless\) \(dimensionless\)
\( h \) = leg lengths of one and two extension \( in \) \( mm \)