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Spring Essentials – The Importance of Spring Index

by | Jan 1, 2006 | Articles, Springs Magazine

The index of a spring is a key indicator of spring design. As we explained in a previous issue, the index is the mean diameter divided by the wire size. This ratio tells us how tightly the spring is coiled. For any given wire size, there is a diameter that is too small for the wire to be formed around without damaging the material.

Springs with smaller indexes tend to have shorter lives than those with larger indexes.This is important for spring designers to take into consideration when designing springs for long life.

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