Spring Wire Length
Spring 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.
Compression Spring Wire Length formulas |
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| Symbol | English | Metric |
| \( L_c \) = coil wire length | \( in \) | \( mm \) |
| \( L_t \) = total wire length | \( in \) | \( mm \) |
| \( \pi \) = Pi | \(3.141 592 653 ...\) | |
| \( D \) = mean coil diameter | \( in \) | \( mm \) |
| \( n_t \) = total number of coils | \(dimensionless\) | |
Extension Spring Wire Length formulas |
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\( L_c = \pi \; D \) (one coil wire length) \( L_t = L_c \; ( n_t + 2 \; h ) \) (total wire length) |
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| Symbol | English | Metric |
| \( L_c \) = coil wire length | \( in \) | \( mm \) |
| \( L_t \) = total wire length | \( in \) | \( mm \) |
| \( \pi \) = Pi | \(3.141 592 653 ...\) | |
| \( D \) = mean coil diameter | \( in \) | \( mm \) |
| \( n_t \) = total number of coils | \(dimensionless\) | |
| \( h \) = height of 2 coils (hooks) | \( in \) | \( mm \) |
Extension Spring Wire Length formulas |
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\( L_c = \pi \; D \) (one coil wire length) \( L_t = L_c \; ( n_t + 2 \; h ) \) (total wire length) |
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| Symbol | English | Metric |
| \( L_c \) = coil wire length | \( in \) | \( mm \) |
| \( L_t \) = total wire length | \( in \) | \( mm \) |
| \( \pi \) = Pi | \(3.141 592 653 ...\) | |
| \( D \) = mean coil diameter | \( in \) | \( mm \) |
| \( n_t \) = total number of coils | \(dimensionless\) | |
| \( h \) = leg lengths of one and two extension | \( in \) | \( mm \) |
