Spring Index
Spring index, abbreviated as C, a dimensionless number, is the ratio between the spring and wire diameter for a helical spring. This number tells how tight the springs coils are. All wire sizes have a limit to the coil diameter being formed, too small there can be damage to the material. A higher spring index has a smaller wire and a larger spring diameter. A lower spring index has a larger wire and a smaller spring diameter.
Spring Index formulas |
||
\(\large{ C = \frac{ D }{ d } }\) \(\large{ C = \frac{ 2 \; r }{ d } }\) |
||
Symbol | English | Metric |
\(\large{ C }\) = spring index | \(\large{ dimensionless }\) | |
\(\large{ D }\) = spring diameter | \(\large{ in }\) | \(\large{ mm }\) |
\(\large{ r }\) = spring radius | \(\large{ in }\) | \(\large{ mm }\) |
\(\large{ d }\) = wire diameter | \(\large{ in }\) | \(\large{ mm }\) |
Tags: Spring