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The Engineer’s Guide to Specialty Springs
Table of Contents
Think of a specialty spring as a spring that’s built for your design—not the other way around. Unlike standard catalog springs that come in fixed sizes and shapes, specialty springs are tailored in terms of coil shape, length, strength, and materials. They’re designed to meet unique requirements: whether it’s squeezing into a tight space, handling an unusual load, or fitting perfectly with a specific assembly. So, if you’re working on a project that’s even a little out of the ordinary, chances are you’ll need a custom spring to bring your idea to life.
Let’s break it down spring-by-spring. Each type has a unique role to play, and knowing when to use which one can make all the difference.
1. Compression Springs
These are the classic coil springs that push back when you press them. You’ve seen them in everything from click pens to car suspensions. When you apply a load, the spring compresses and stores energy, which is released when the load is removed.
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Use them when: You need a force that pushes two parts apart, or returns a component to its original position after being pressed.
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Design tip: Make sure you leave room for the spring to compress—but don’t let it compress all the way to "solid height," or it could get damaged over time.
2. Extension (Tension) Springs
These springs do the opposite of compression springs. They pull back when stretched. They’re usually tightly wound and come with hooks or loops at the ends so they can attach to components.
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Use them when: You want something to return to its original position after being pulled—like in a garage door system or trampoline springs.
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Design tip: Pay attention to the initial tension—that’s the built-in force required to start stretching the spring.
3. Torsion Springs
Torsion springs are all about twisting. Instead of stretching or compressing, they provide a rotational or torque-based force. The spring is usually anchored at one end and twisted at the other.
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Use them when: You’re working with rotating parts—like a clothespin, a mouse trap, or a door hinge that closes on its own.
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Design tip: Always twist them in the direction they were coiled, or they’ll weaken faster and fail sooner.
4. Conical Springs
These springs are shaped like a cone—wider at one end and tapering to a point. Because of this shape, the coils can nest inside each other when compressed.
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Use them when: You need more compression travel but want to save space on the solid height.
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Design tip: Their shape also helps prevent buckling, which makes them a good choice for vertical applications without guides.
5. Barrel Springs
These look like a barrel—narrow at both ends and wider in the middle. It’s a subtle design tweak that adds a lot of stability.
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Use them when: You need a longer spring that can compress under load without bending or buckling sideways.
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Design tip: Perfect for situations where space is tight, but stability is still important.
6. Double Torsion Springs
Double torsion springs combine two torsion springs wound in opposite directions, connected by a central wire segment. They can deliver more torque and symmetrical force.
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Use them when: You need balanced torque or extra rotational force, like in certain clamps, tools, or lid mechanisms.
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Design tip: Make sure the center section is long and strong enough to keep both coils from interfering with each other.
7. Garter Springs
These are springs formed into a circle by connecting the ends of an extension spring. They apply a constant radial force, like a rubber band made of coiled wire.
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Use them when: You need constant circular pressure—great for things like oil seals or holding components snugly around a shaft.
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Design tip: The way the ends connect (hook, tapered, or connector) affects the strength and reliability of the loop.
8. Magazine Springs
These are specially-shaped compression springs used inside firearm magazines. They’re often curved or zigzagged to match the shape of the magazine.
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Use them when: You need even, reliable force in a tight, irregularly shaped container.
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Design tip: These springs often work close to their solid height, so design them carefully to avoid long-term fatigue.
9. Wire Forms
Wire forms aren’t necessarily coiled like typical springs. Instead, they’re custom bent into shapes that provide some flexibility or structure.
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Use them when: You need a piece of wire to bend, snap, hold, or latch without complex mechanics.
- Design tip: Tempered wire gives you the best combination of formability and spring-back.
Designing a spring from scratch might sound intimidating, but Spring Creator 5.0 makes it surprisingly easy—even if this is your first time working with springs. It's a free online tool from Acxess Spring that helps you calculate all the important specs.
How It Works:
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Pick your spring type. Choose between compression, extension, or torsion.
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Fill in the blanks. Enter known values like wire diameter, number of coils, or target loads.
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Get instant results. You’ll see spring rate, travel, load points, stress levels, and even warnings if something looks unsafe.
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See it in 3D. You can view a rotating model of your spring and download CAD files for your designs.
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Get a quote. Use the Instant Spring Quote feature to find out what it would cost to make your spring.
Why You’ll Love It:
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It checks for errors and unsafe conditions automatically.
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It gives you real engineering data that’s about 99% accurate.
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You can download blueprints and spec sheets to share or use in reports.
Even if you’re still learning the ropes, this tool gives you the power to design with confidence. And if you get stuck, Acxess Spring’s engineers are just a message away.
If you're new to spring design—or just trying to wrap your head around all the possibilities—this section sums up the essentials. These quick takeaways will help solidify the most important lessons from the guide. Keep these in mind as you move forward in your projects, and you'll already be ahead of the game.
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Custom springs = custom solutions. Specialty springs help you solve real design problems with precision.
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Master the basics. Knowing your load, travel, and spring rate makes you a smarter designer.
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Different spring types do different jobs. Match the right spring to the task at hand.
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Use the tools. Spring Creator 5.0 is a huge time-saver that does the math for you.
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Get expert help. Don’t hesitate to reach out to the pros at Acxess Spring for advice and guidance.
No matter where you are in your engineering journey, remember: springs are powerful, flexible tools—and when you know how to design them well, your projects become that much better. Now go build something great—and make it bounce back!