BelleFlex™ Home /Tech Tips / Spring Rate

What is the spring rate?

The spring rate is the amount of force required divided by the corresponding deflection of a spring. This is measured in lb/in or N/mm. Every spring has its own spring rate, depending on its geometry and material.

The formula to determine the load at a specific deflection uses Poisson’s ratio, Young’s modulus, as well as the outside and inside diameters, height, and thickness of the specific Belleville disc spring. Our engineers are experienced in applying the formula to determine the spring you need, based on your specific requirements.