What Affects the Life Cycle of a Spring?
There are several factors that can affect the life cycle of your springs. One main factor is exceeding your spring’s elasticity and load limits. Other factors that will affect your spring’s fatigue life are its environmental surroundings and any friction as well as the impact it is submitted to.
Exceeding your spring’s max safe travel or max safe load is the main reason it can fail and take a permanent set. A spring isn’t always capable of traveling down to solid height. If your spring has a tight coil index or a small number of coils, it may be under a lot of stress. Having a stressed spring will put it at risk of not compressing as far as you’d like. To avoid this from happening, you can make a few adjustments as shown in the force chart below.
| Less Force | More Force |
|---|---|
| – Wire Diameter | + Wire Diameter |
| + Outer Diameter | – Outer Diameter |
| + Coils | – Coils |
| + Free Length | – Free Length |
When a spring goes inside a hole or over a shaft, there must be clearance between the spring’s diameters and the walls of the hole or shaft. If your spring is really tight against those walls, there will be friction when it travels. This will wear out the wire and lessen the spring’s force thus causing either a permanent set or risk of breakage.
Environment is also very important to your spring’s design. Picking the wrong material type can definitely cause your spring to fail. We have a page on the properties of common spring materials. You can visit this page to confirm that you’ve selected the correct material or use the information to select a material type. Be sure to take into consideration the temperature and humidity your spring will be exposed to, as well as any magnetic fields surrounding it.
Your spring’s life cycle is affected by all of these factors. There are specific formulas used to calculate the approximate life expectancy of a coil spring. Feel free to contact our engineers and sales team for further help on calculating the life cycle of your spring.
That’s a deceptively simple question, with a lot going on underneath. In truth, how long a spring lasts depends on how it’s designed, how it’s used, and the environment it works in. Some springs might last for just a few thousand cycles, while others keep going strong for millions.
In this guide, we’ll walk through what really affects a spring’s lifespan (also known as spring fatigue life), how to avoid common pitfalls like coil spring failure, and how to make better choices when designing your own custom spring—whether you’re using a tool like Spring Creator 5.0 or getting help from the engineers at Acxess Spring.
Springs don’t just wear out randomly—there are always reasons behind it. The life cycle of a spring is all about how it handles stress, and a few key things can really make or break how long it lasts:
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Stress and how often it’s used – Springs bend every time they’re loaded. If they bend too far or too often, they start to weaken. The more stress, the fewer cycles they survive.
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Material matters – Not all spring materials are created equal. Some are better for humid environments, others can handle high temps. Pick the wrong one and your spring may rust, deform, or crack early.
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The design itself – Things like wire size, number of coils, and the overall shape of the spring all affect how much stress gets distributed across it.
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Fit and friction – If your spring is squeezed into a tight space and rubbing on other parts, that friction eats away at it fast.
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Where it’s used – Heat, moisture, chemicals, and even magnetic fields can all reduce a spring’s life if it’s not made to deal with them.
Knowing what your spring is up against helps you design something that’ll hold up over time—and save you headaches down the road.
One of the quickest ways to ruin a spring is by pushing it too far. If you compress it more than it's designed for (beyond its maximum safe travel) or apply more load than it can handle (maximum safe load), it may not bounce back. That’s what we call taking a permanent set—basically, the spring is stretched or squished to the point where it won’t return to its original shape.
Springs aren’t always meant to be compressed all the way down to their solid height. Trying to do so—especially if your spring has a tight coil index or just a few coils—can stress it out way beyond what it was built for.
Tools like Online Spring Force Tester are super helpful here. They’ll show you the max travel and max load before you even build the spring, and it would let you test your design at different loads, so you can tweak the design ahead of time instead of watching it fail in the real world.
The coil index (that’s the ratio between the diameter of the coil and the thickness of the wire) and the number of coils play a big part in how durable your spring is. A coil index that’s too tight—meaning thick wire and small coil diameter—puts a ton of stress on the spring every time it moves. Not good for long-term use.
The same goes for having too few coils. When there aren’t enough, the load isn’t spread out well, and each coil takes more punishment. That means the spring could wear out or snap way sooner than you'd like.
The sweet spot? A moderate coil index (usually somewhere between 6 and 12) and enough coils to distribute the stress evenly. It’s all about balance.
Need your spring to be stronger? Softer? You can fine-tune that by tweaking the design. Here’s a simple way to look at it:
|
Parameter |
To Make It Softer |
To Make It Stronger |
|
Wire Diameter |
Use thinner wire |
Use thicker wire |
|
Outer Diameter (OD) |
Make the OD wider |
Make the OD narrower |
|
Number of Coils |
Add more coils |
Use fewer coils |
|
Free Length |
Increase spring length |
Shorten the spring |
These changes don’t just affect the spring’s force—they also change how much stress it’s under. For example, a stronger spring (thicker wire, fewer coils) usually deals with more stress, which can shorten its fatigue life. So when you’re adjusting your design, make sure to keep an eye on the stress levels too. Again, Spring Creator 5.0 makes this easy to visualize in real time.
If your spring is rubbing up against something every time it moves—like the wall of a hole or a shaft—it’s going to wear out fast. This kind of friction can thin the wire, mess with the spring’s performance, and eventually lead to failure.
Always leave a little clearance. A spring should be just slightly smaller than the hole it sits in, or slightly bigger than the shaft it wraps around. That way, it can move freely without scraping against other surfaces.
Watch out for signs like shiny spots, unusual wear, or reduced force over time. These are signs your spring is rubbing too much, and that friction could lead to early failure.
How Does the Environment Affect a Spring’s Fatigue Life?
Springs don’t live in a vacuum (unless they do—hello, aerospace engineers!). Most springs have to deal with moisture, heat, chemicals, or all of the above. If your material can’t handle the environment, your spring’s going to fail early.
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Moisture? Use stainless steel or plated finishes to avoid rust.
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High heat? Consider chrome silicon.
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Magnetic fields or sensitive electronics? Look into non-magnetic materials like beryllium copper.
Check out Acxess Spring’s spring material guide to find out what each material is good for. Picking the right one makes a massive difference in how long your spring lasts.
So, how long do springs last? The honest answer is: it depends. But if you pay attention to the right factors—stress, material, fit, environment—you can build springs that last for millions of cycles.
Whether you’re designing with Spring Creator 5.0 or brainstorming with an engineer, just remember that small choices early on make a big difference later.
5 Key Takeaways:
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Don’t push the limits. Overloading or over-compressing is a fast track to failure.
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Design with balance. A good coil index and enough coils help reduce stress.
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Tweak wisely. Want more or less force? Change the wire size, diameter, coils, or length—but don’t forget about stress.
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Avoid rubbing. Friction from tight fits causes wear, which weakens your spring fast.
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Match material to the environment. The right spring material stands up to heat, moisture, and more.
Get these basics right, and your spring won’t just last—it’ll thrive.