Spring Index - Effect on Cost

The Spring Index is the ratio between a spring's mean coil diameter and its wire diameter. Typically, our engineering team follows a guideline: a Spring Index ranging from 4 to 12 is considered ideal. Venturing beyond these boundaries necessitates additional considerations before manufacturing.

Potential effects of an index outside of the 4 to 12 limits:

• Longer machine setup time = higher cost

• Slower production rate = higher cost

• Accelerated tool wear = higher cost

• Squareness issues = fit/function problems

Reach out to Southern Precision Spring to collaborate on your next spring design.