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Spring Pitch Calculator

Formula

The formula to calculate the Spring Pitch is:

$SP = \frac{L - 3D}{NA}$

Where:

$SP$ is the Spring Pitch (in/coil)
$L$ is the length (in)
$D$ is the diameter (in)
$NA$ is the number of active coils

What is Spring Pitch?

Spring Pitch is the distance between the coils of a spring, measured in inches per coil. It is calculated by subtracting three times the diameter of the spring from its length and then dividing by the number of active coils. This measurement is crucial in determining the mechanical properties and behavior of the spring under load.

Example Calculation

Let's assume the following values:

Length (L) = 10 inches
Diameter (D) = 0.5 inches
Number of Active Coils (NA) = 20

Using the formula:

$SP = \frac{10 - 3 \times 0.5}{20} = 0.425 \text{ in/coil}$

The Spring Pitch (SP) is 0.425 in/coil.