Easy to solve your doubts.
The most accurate way is with a pair of calipers, especially if it's a smaller spring. The next best is a sliding rule.
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The best way is to use the spark test. With a hand rotary tool, gentle touch the spring to the sanding plate. If the spring sparks, it is carbon steel. To learn more follow the link below to our blog post about materials.

For smaller wire diameters, a hand help nipper will work. However, large wire diameters should be cut with an abrasive cut off wheel.

Our expertise in the custom manufacturing of extension springs and garter springs allows us to meet even the most challenging job specifications.

Precise, high tolerance springs with outstanding resistance to corrosion and temperature variations.