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Torsion Spring Measurement Guide

Torsion springs exert rotary force by twisting. Designed to fit a variety of applications, torsion springs include a coiled section of wire and two legs. Common torsion spring applications include mouse traps, car door handles and clipboard clamps. To find out how to measure torsion springs, follow this brief guideline.

8 Torsion Spring Dimensions

How to measure a torsion spring guideTo begin, it’s important to understand a few fundamental features of torsion spring design. When you measure a torsion spring, you must determine the following elements:

  • Wind direction
  • Outer diameter
  • Inner diameter
  • Wire diameter
  • Leg length 1
  • Leg length 2
  • Body length
  • Total coils

For more clarification around spring and wire form terms, explore our terminology glossary. Follow the steps below to obtain correct torsion spring measurements.

Measuring Torsion Springs

To measure a torsion spring, you will need a micrometer, dial calipers, or a tape measure for larger springs, such as garage door springs. Use the following instructions to find accurate torsion spring measurements:

  1. To find the wind direction, examine the end of the spring. If it points in a counterclockwise direction, it is right wound. If it points in a clockwise direction, it is left wound.
  2. Measure the outer diameter by placing your dial calipers in the middle of the spring, as the end coils may skew slightly larger.
  3. Inner diameter can be found by placing your dial calipers across the hole within the coils.
  4. Position your dial calipers on the leg to measure the wire diameter.
  5. Leg length is measured from the center of the spring to the end of the leg. Measure several times for an accurate reading. Repeat this measurement for the second leg.
  6. Find the body length by measuring the overall end-to-end length of the spring.
  7. Count the total coils, starting under where the leg leaves the spring’s body. Count all full coils until you reach the other end, including a fraction of a coil.


From standard torsion springs to complex, made-to-order items, Master Spring works closely with you to determine your application requirements. Learn more about torsion spring designs and custom prototyping, or contact us for help with your spring measurement.

Get Your Free Torsion Spring Quote Today

Master Spring designs and manufactures custom torsion springs for a range of applications and industries, including commercial lighting, renewable energy, and others. Our modern technology can manufacture torsion springs with wire diameters as small as 0.010” or as large as 0.250” (0.25 mm to 6.4 mm). Common torsion spring materials include:


  • High carbon spring wire
  • Carbon and alloy wire
  • Hard drawn wire
  • Alloy steel wire
  • Stainless steel wire
  • Non-ferrous alloy wire

No matter your design, size specifications or budget, the Master Spring team wants to talk to you and find the best torsion spring solution for your exact application.

Request a FREE Torsion Spring Quote

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1340 Ardmore Ave., Itasca, IL 60143

Phone: 708.453.2570 | Fax: 708-453-6420