A proper heat-treatment of the springs at 300°C is essential and gets the best results for high quality springs.

If a spring does not get heat-treated properly at the right temperature - the loss of height is much bigger.
The spring test shows you the different loss of heights of 3 springs with same specifications but heat treated at different temperatures.

A perfect heat-treatment guarantees a high quality spring, avoids sagging and saves wire.
PLEASE HAVE A LOOK AT THE VIDEO AND UNDERSTAND BETTER

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