Extension Spring

Your Professional Extension Spring Supplier

We have over 20 years spring manufacturing experience, and today produce the world's largest range of coil springs for the automotive aftermarket.tobacco pusher springs, In addition to replacement coil springs, we also stock market leading ranges of Gas, Leaf and Sport springs.At Hangzhou Norvee Machine Co., Ltd, we are dedicated to meeting the needs of our clients and providing them with reliable auto parts solutions.

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Why Choose Us

Wide Range of Applications
Our wide range of products includes tobacco pusher springs, gas springs (gas struts), coil springs, extension springs, and more.

Main Market
With our dedication to excellence, we have established long-term partnerships with clients from various countries such as the USA, Canada, Germany, Holland, Australia, Russia, Ukraine, and more.

Our Service
Reputable companies, in order to improve the majority of the customers pre-market after-sales service.

Company Honor
Located in Hangzhou, China, we specialize in providing OEM services based on clients' drawings or samples.

Advantages of Using Extension Springs

Energy Storage

Extension springs efficiently store mechanical energy when extended, releasing it to return to their original position.

Durability

Made from robust materials, extension springs are resistant to fatigue, wear, and environmental factors, ensuring a long service life even under repeated use.

Versatility

With various sizes, materials, and end configurations available, extension springs can be tailored to fit a wide range of applications, from small precision devices to large industrial machinery.

Product Parameters

Material Testing
We monitor every lot of wire material that is submitted for testing and prototyping to ensure the highest quality product.

Dimensional Accuracy
This involves measuring critical dimensions of the extension spring, such as wire diameter, outer diameter, length, and the number of active coils. This ensures that the spring conforms to your specified design requirements.

Load Testing
This test involves subjecting the extension spring to various loads to verify that it can extend and retract without any deformation or failure. The load should be applied gradually to prevent sudden overloading.

Elasticity and Stress Testing

This test evaluates how well the spring returns to its original shape after being stretched. It measures factors like modulus of elasticity and yield strength to ensure the spring can handle the expected loads.

Fatigue Testing

Extension springs are often subjected to repeated cycles of loading and unloading. Fatigue testing simulates these conditions to ensure the spring can withstand the anticipated number of cycles without failure.

Load Testing

This involves applying a load to the spring and measuring the corresponding deflection. This helps characterize the spring’s behavior under different loads.

Visual Inspection

A visual examination of the spring is crucial to identify any surface defects, such as cracks, pitting, or other anomalies.

Specification

Item	Spec
Style	Hardware spring
Material	Stainless steel,alloy,brass, copper, aluminum,iron etc
Usage	Car,high-speed rail,Industrial,furniture,toy,gift,office equipment etc
Size	Customized size
Color	Sliver, black, white etc, can customized
Design	Customized
Surface	Zn-plating, Ni-plating, Cr-plating, Tin-plating, copper plating, silver plating etc
Sample time	About 3-7 days

Extension Spring Capabilities

Material Shapes & Sizes

.004 to .625 inches (.1016 to 15.875mm) in wire diameter

Up to 2 inches (50mm) in bar stock

Round wire

Square wire

Rectangular wire

Special section wire

And a large variety of materials available

Common Uses for Extension Springs

Garage doors: Garage doors may be one of the most well-known extension spring applications. These are the springs that attach to the sides of your door that come into play when you attempt to raise or lower the door, helping to mitigate some of the strength needed to lift or close a door that may weigh hundreds of pounds.

Automotive: You may not find extension springs as much in modern cars, as they were a key component of your vehicle’s carburetor.

Trampolines: Trampolines are another very popular use of extension springs. You can see them in action as you or your family members jump up and down since extension springs enable the trampoline to bounce.

Toys: In the past, many more toys utilized extension springs for shooting actions, but both the tiny springs themselves and the projectiles they fired were considered unsafe for children.

Pliers: The vise-grip type of pliers that not only grip but can be locked into position to keep the grip tight use extension springs, which are employed to hold the grip in place.

Washing machines: A washing machine is probably one of the last things you might think of when it comes to mechanical extension spring applications, but in fact, they are a critical part of the machinery.

Medical devices: For centuries, the medical world has relied on springs to function. You can be sure that includes extension springs. You can find extension springs in stretchers, surgical lights and more.

Farm equipment: Just as many automobiles use extension springs, farm vehicles use them, as well. However, they are especially useful for farm vehicles because these machines are so heavy and require so much pulling strength.

Packing & Delivery

Packaging:

For the plate heat exchanger and plates, standard export plywood boxes are used to protect the products from damage during delivery;
Shipping:
1. Delivered by Air
2. Shipped by Sea
3. Delivered by international express like DHL, TNT, UPS, etc.
4. Based on the requirements of the customers.
5. Packaging Detail: plywood case or as your request.
6. Delivery Detail: 10days

customized packaging

We customize the packing according to the requirements.

FAQ

Q: What material should I choose for the extension spring?

A: Common materials for extension springs include music wire, different grades of stainless steel, and other specialized non-steel alloys. Consider the corrosion resistance and your application's temperature and loading requirements.

Q: What are the benefits of using hook ends on extension springs?

A: Hook ends provide a simple and efficient way to attach extension springs to various components, ensuring a secure connection while maintaining flexibility in movement. The design of hook ends allows for easy installation and removal, making them ideal for applications where springs may need to be replaced or adjusted frequently, such as in automotive systems, industrial machinery, or consumer products like trampolines. Extension springs with hook ends are particularly useful when you need to minimize installation time without sacrificing performance.

Q: How can I extend the life of my extension spring?

A: To enhance the longevity of extension springs:
Optimize Design: Minimize stress by choosing an extension spring with the right wire diameters or investigate whether you can reduce your application’s design loads.
Material and Environmental Protection: Choose suitable materials and treatments for specific environmental conditions.
Frequency Considerations: Ensure the operating frequency is significantly lower than the spring's natural frequency to avoid resonance vibration wear and tear.

Q: What materials are commonly used for extension springs?

A: Extension springs are typically manufactured from various types of high-quality steel, including music wire, stainless steel, and spring steel alloys. The choice of material depends on factors like the application, environmental conditions, and desired spring properties.

We're professional extension springs manufacturers and suppliers in China, specialized in providing high quality custom service. We warmly welcome you to buy cheap extension springs from our factory. For price consultation, contact us.

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