How to measure compression spring

1. With one hand holding the base of the spring, another hand holding the caliper. 2. The caliper on the outer edge of the * after a coil, * big size measurement. (this is known as a diameter OD) 。 3. Caliper on the center of the spring steel wire. This is known as a wire size or material. You should also be measured at the end of the wire in order to compare and accurate. 4. Put the uncompressed calipers on the whole length of the spring. This is called free length. 5. Calculate the total coil, from the beginning of the end, close to the location of the wire cutting. Ensure that calculate all coil, including any part of the coil.
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