Spring Pitch

on . Posted in Fastener

Spring pitch, abbreviated as p, is to the distance between successive coils or turns in a helical spring.  It is an important parameter that defines the spring's geometry and can affect its performance characteristics, such as stiffness and load carrying capacity.  The spring pitch is measured along the axis of the spring and is the axial distance between two adjacent points on the wire that forms the coil.  In other words, it is the distance from one point on a coil to the corresponding point on the next coil, measured parallel to the axis of the spring.

The spring pitch can be an essential factor in designing springs for specific applications.  It is related to the spring's wire diameter, the number of coils, and the spring's overall length.  By altering the pitch, you can change the spring's characteristics, such as its stiffness and the amount of force it can exert when compressed or extended.

 

Spring Pitch formula

\(\large{ p = ( L - h  \;/\; n_a )  + d  }\) 
Symbol English Metric
\( p \) = pitch \( deg \)  \( rad \) 
\( L \) = free length \( in \) \( mm \)
\( h \) = solid coil height \(in \)  \(\ mm \) 
\( n_s \) = spring rate \(lbf\;/\;in\) \(kg\;/\;mm\)
\( d \) = wire diameter \( in \) \( mm \)

 

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Tags: Spring