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Spring Index ....
Spring Stress Values....
Compression Spring Formula....
Compression Spring End Designs .... Extension Springs.... Rectangular Section Springs.... Conical Helical Springs....
A spiral spring consists of a strip or wire wound in a flat spiral . This is subject
to a torque to produce an angular deflection. A typical spiral spring is a clock spring
Note: metres (m) have been shown as the units of length in all of the variables above
for consistency. In most practical calculations milli-metres will be more
The spring rate k is defined on this webpage as the torque (Nm)per unit angular deflection (θ ).
Spiral Spring Formulae
length of Strip
Spring sureface stress
Links to Spring Design
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Last Updated 5/09/2009