When it comes to designing the specifications for your custom springs, progressive vs. linear rates is one of the decisions you will have to make. Both compression and extension springs can have either a linear or progressive rate, so it’s a decision that can be applied to many springs that we create.

Here’s a basic breakdown of linear rate and progressive rate springs to help you understand the difference between the two types of design choices.

spring manufacturing machineLinear Spring Rate

Springs with a linear rate maintain a constant, equal distance between coils. These springs follow Hooke’s Law, which states that the distance a spring will compress or extend is directly proportional to the force applied to it. The equation of Hooke’s law is written as F = k × e. Linear springs, or constant rate springs, are a common order for manufacturers.

Variable rate springs differ from linear rate springs in that they do no maintain an equal distance between coils. There are two main types of variable rate springs:

Progressive Spring Rate

The distance between the coils of springs with a progressive rate either increase or decrease as more coils are added. This can be at a constant rate, or the distance between coils can increase substantially at an equal rate. This allows the spring to have multiple rates. The initial rate will require a certain amount of force to deflect the spring, but as the coils condense (or expand) a greater amount of force becomes necessary for spring deflection to take place.

The advantage of progressive spring rate in compression spring design, for example, is that the compression spring will be able to become stiffer more quickly. The springs are also able to absorb small amounts of force while also being firm enough to handle large amounts of force.

The Parts You Need, The Way You Need Them

When you work with The Yost Superior Co., You can get the spring and wire form parts you need tailored to your precise specifications. Looking for springs with a linear, progressive, or dual spring rate? Get in touch with us today and let us know exactly what you need.