Your Professional Extension Springs Supplier
Zhuji Xuanyu Spring Co., Ltd. (formerly Zhuji Printing Machine Spring Factory) is a high-quality spring manufacturer with 28 years of professional experience, recognized as a pioneer and leader in China’s printing press and die-cutting machine industries. We are consistently dedicated to providing exceptional spring solutions for our clients.
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Drawbar SpringsDrawbar Springs have a special end design. They use a threaded rod or pull ring instead of a hook. This gives you a stronger and safer connection. The rod or ring bolts directly to your machine. This -
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Power SpringsWe have special knowledge in Power Springs. We know how to pick the right strip width and thickness. We control the coiling tension with care. Our heat treatment process is also tuned for flat strip. -
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Stainless Steel Pull SpringsStainless Steel Pull Springs are our answer for corrosive environments. They use SUS304 or SUS316 stainless steel. This gives them great rust protection and chemical resistance. They also keep the -
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Pulling SpringsPulling Springs is a general name for tension springs. They are the same as Tension Springs in our product line. The name product points to their main job. They provide a pulling force to keep -
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Extension Springs With Hook EndsExtension Springs with Hook Ends are one of the most popular spring types. They have hooks on both ends. This design makes them fast and easy to put in your machine. You do not need special tools. -
![Stainless Steel Tension Springs]()
Stainless Steel Tension SpringsStainless Steel Tension Springs are made for tough places where rust is a problem. Normal steel springs rust fast in wet or acidic conditions. Our product stay clean and keep their strength. We use -
![Heavy Duty Extension Springs]()
Heavy Duty Extension SpringsHeavy Duty Extension Springs are built for tough jobs. They are different from regular springs. They use thicker wire and stronger alloys. This allows them to handle much heavier loads. Our Heavy -
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Extension Coil SpringsExtension Coil Springs are one of the most common spring types in the world. They give you a pulling force when you stretch them. The spring has a spiral coil shape with hooks or loops on each end. -
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Trampoline SpringsTrampoline Springs might look simple, but safety is our top priority. A poor spring can break during use. This can cause serious injury. That's why our Trampoline Springs are made with great care. We -
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Garage Door Tension SpringsGarage Door Tension Springs are one of our most mature products. They are made to balance the weight of garage doors. This helps the door move up and down with ease. The idea is simple. The spring -
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Tension SpringsOur Tension Springs are a core product at Zhuji Xuanyu Spring Co., Ltd. We have focused on them for 28 years. We started in a small factory in Zhuji, Zhejiang. Today, we serve global brands like -
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Swivel Hook Extension SpringUnlike standard fixed-hook extension springs, this design allows multi-angle movement, misalignment compensation, and dynamic load adaptation during operation. It effectively reduces stress
Why choose us
Quality Control
We maintain a strict internal inspection process. Each batch of products undergoes multiple tests, including accuracy, pressure resistance, and service life. Key inspection data can be provided upon request.
Logistics Solutions
With extensive export experience, we can arrange sea freight or international express delivery (DHL, FedEx, etc.) and offer trade terms such as FOB Ningbo/Shanghai to ensure safe and efficient delivery.
Sales Market
We have established stable supply partnerships in Southeast Asia, Europe, North America, and the Middle East, and we have served customers from countries such as Germany, Japan, the United States, and India for many years.
Our Service
From order placement to shipment, we maintain close communication. You can track order progress at any time, and we can provide photos or videos of key production stages upon request, allowing you to monitor quality remotely.
Product Description
|
Model |
Extension springs |
|
Material Type |
SS302(AISI302)/ SS304(AISI304)/ SS316(AISI316)/SS301(AISI301)/SS631/65Mn(AISI1066)/60Si2Mn(HD2600)/55CrSiA(HD1550)/Music wire/C17200/C64200, Etc. |
|
Wire diameter |
0.1~20 mm |
|
I.D |
>=0.4 mm |
|
O.D |
>=0.6 mm |
|
Free length |
>=3 mm |
|
Body Length |
>=0.5 mm |
|
Total Coils |
>=2 |
|
Hook Type |
Cross over hook, extended hooks, machine hooks, side hooks |
|
Hook Length |
>=1 |
|
Tolerance |
>=0.05 mm |
|
Packaging |
PE bags, Cartons, Pallets |
|
Warranty period |
One year |
|
Application |
Electronic producats, Children toys, Baby carriage, Bicycle, Kitchen appliances, Cameras, Printers, Office equipment, Precision equipment and various kinds of vehicles |
|
Finish |
Zinc plating, Nickel plating, Anodic oxidation,Black oxided,Electrophoresis, Power coating, Gold plating, Silver plating, Tin plating, Paint,Chorme, Phosphate, Dacromet,Oil coating, Copper plating, Sand blasting, Passivation, Polishing,Etc. |
|
Notes |
1. Please offer us your spring spec,we can make spring based on your requirements. |
|
2. Discount offered if with large order quantity. |
Our custom spring manufacturing capabilities include:
• The common wire diameter for extension springs ranges from 0.1mm to 25.00mm, and non-standard customization is supported.
• A variety of ends, including twist, German hooks, cross center, side loops, flat stock hooks and extended hooks.
• An array of material types including stainless steel, music wire, hard drawn and more.
• Custom extension spring designs to match your specific requirements and tensions.
We have the expertise and latest equipment to design and manufacture your next extension spring order.
How to Measure an Extension Spring
Proper measurement is crucial to ensure that an extension spring fits and functions as intended in its application. Here’s how to measure the key dimensions of an extension spring:
Wire Diameter (WD): The thickness of the spring wire is one of the most important measurements. To measure the wire diameter, use a digital caliper and place it around the wire to get an accurate reading. Small variations in wire diameter can significantly impact the spring’s performance.
Outer Diameter (OD): This is the distance across the outermost part of the spring coil. To measure it, use a caliper to measure from one side of the coil to the opposite side at its widest point. This ensures that the spring will fit properly in the housing or space it is intended for.
Free Length (FL): The free length is the total length of the spring, including the coils and any hooks or loops. To measure this, stretch the spring gently so that it is not under load, and use a ruler or caliper to measure from one end of the spring to the other.
Total Coils (TC): Count the number of full coils in the spring, excluding any that form the hooks or loops. The number of coils affects the spring’s tension and overall flexibility, so this is an important factor to consider.
Hook Type: Measure the length and shape of the spring’s hooks or loops to ensure they will fit within your assembly. Different hook types provide different levels of strength and durability, so this is crucial for selecting the right spring.
We offer a wide range of materials to suit various applications
Stainless Steel
Corrosion-resistant and durable.
01
Steel
Provides high tensile strength.
02
Wire
Versatile options for diverse needs.
03
Copper
Excellent conductivity.
04
Brass
Resistant to corrosion and wear.
05
Before manufacturing extension springs, designers and manufacturers need to work together to determine the important parameters of each spring. In extension springs, designers need to define:
Spring diameter: The size of a circular spring’s cross section.
Free length: The length of the spring when at rest.
Maximum extended length
The farthest the spring can be stretched without damaging or overstressing the spring.
Ends
The loops or hooks at each end of the spring.
Wire diameter
Along with material, wire diameter does a lot to determine the behavior of the spring.
Certificates
FAQ
As one of the most professional extension sprins manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to wholesale bulk customized extension sprins made in China here from our factory. Contact us for more details.
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