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Compression Spring Measurement Guide

Compression spring dimensions are defined as the measurements critical to the design of a compression spring. There are endless compression spring designs, and knowing how to find precise measurements will help you determine the best spring for your needs.

To measure a compression spring, you can use dial calipers, a micrometer, a ruler or tape measure for larger springs.

5 Compression Spring Dimensions

When measuring a compression spring, you must determine the following five elements:

  1. Outer diameter is measured by placing your dial calipers on the outside of the coil’s width.
  2. Inner diameter is defined as the width of the inside of a coil spring’s diameter measured from the center of the helix. Sometimes, inner diameter can be difficult to measure accurately. The formula to calculate inner diameter is I.D. = O.D. – 2d where 2d is two wire diameters.
  3. Defined as the full length of an uncompressed spring, free length is easy to find. To measure, place your calipers on the full length of the spring.
  4. Wire diameter is found by placing your calipers on the wire in the center of your spring.
  5. Total coil count is defined as each full rotation and the remainder of the last coil.

As you learn about taking accurate spring dimensions, explore compression spring terminology for helpful symbols and definitions.

illustration of how to measure compression spring force

Get Your Free Compression Spring Quote Today

For more than 70 years, Master Spring has designed and manufactured custom compression springs for a range of applications. We are dedicated to measuring, testing and innovating custom spring solutions that work within your specifications and budget. The Master Spring team wants to talk to you, learn your industry, and find the best spring and wire form manufacturing solution for you.

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