Guide to Torsion Spring Measurement

Specifying the right torsion spring for your application is the first step in achieving project success. Obtaining an accurate torsion spring measurement is essential. It is not difficult to obtain an accurate spring measurement if you use the correct tools and follow the right steps in taking the measurement.

The required tools include a micrometer, calipers, and a ruler or tape measure. Using these tools, obtain the following four measurements:

Find the wire diameter.
To achieve the highest degree of accuracy, use a micrometer to measure the wire diameter in two different locations on the torsion spring and take the average. This will assure precise readings and accurate ordering.

Find the outside diameter.
Typically referred to as “OD”, measurement of the outside diameter should be taken in the middle of the spring, since the end coils tend to run large.

Find the inside diameter.
Use your calipers to measure the inside diameter of the torsion spring. Since this is a more difficult measurement to accurately read, it is a good idea to double or triple check the measurements.

Measure the leg length of the spring.
Measure from the center to the end. Since the center of the spring is not marked, you’ll need to use your best judgment on this measurement. Again, double and triple checking is a good idea.

Determine the angle or relationship of the legs.
There are four major angles, all based from the center of the spring – 90°, 180°, 270°, and 360° relationship of legs.

Determine the direction of the wind.
Right hand springs follow a counterclockwise rotation. Left hand springs follow a clockwise rotation.

For more details and pictures regarding torsion spring measurement, read our guide to measuring torsion springs. Keep in mind, if you have an unusual spring of any type that is not easy to measure, you can speak to a member of our team for identification and ordering assistance. You can also shop our extensive selection of stock torsion springs.