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When designing a spring and specifying its dimensions, it is critical that the number of coils be counted correctly, as this can have a huge effect on the strength of the spring. Spring end types and end grinding will make a difference in how you count active coils. 

The spring rate, or stiffness, indicates how a spring will perform under load. It is defined as the amount of load required to compress the spring by a unit of length. In heavy-duty applications, selecting a spring with the correct spring rate is essential to ensure that the spring can absorb the required forces without compromising its structural integrity or functionality. A higher spring rate indicates a stiffer spring, which is beneficial for applications involving heavy loads, but it must be balanced with the need for flexibility and shock absorption.