# Spring Pitch

Written by Jerry Ratzlaff on . Posted in Fastener

Spring pitch, abbreviated as p, is the angle of the coils.  The pitch should be 0.5D or smaller.  If the pitch excedes 0.5D, the spring deflection increases to the extent that the coil diameter changes.

## formulas that use Spring Pitch

 $$\large{ p = \frac{ L \;-\; h }{ n_a } + d }$$

### Where:

$$\large{ p }$$ = pitch

$$\large{ L }$$ = free length

$$\large{ h }$$ = solid coil height

$$\large{ n_s }$$ = spring rate

$$\large{ d }$$ = wire diameter

Tags: Equations for Spring