China Spring Manufacturers Suppliers Factory - Customized Spring Made in China

Sanwei:Your Professional Spring Manufacturer!

Hebei Sanwei Fasteners Co., Ltd. is a high-tech enterprise specializing in the research, development, production, and sale of fasteners, located in Hebei Province, China. Since its establishment,wei has been committed to providing customers with high-quality, high-performance fastener solutions, which are widely used in various fields such as construction, machinery manufacturing, automobile, and power communication.

Stainless Steel Coil Springs
Standard: DIN2098. Name: Stainless Steel Coil Springs. Material: 304, 316 stainless steel. Grade: A2-70, A4-80
Custom Coilover Springs
Name: Customized Coil Springs. Material: Customized. Grade: Customized. Nominal Diameter: Customized
Universal Coil Springs
Standard: DIN2098. Name: General Purpose Coil Springs. Material: carbon steel, spring steel, alloy steel, etc.. Grade: 4.8 grade, 5.8 grade, 8.8 grade
Precision Coil Springs
Standard: DIN2098. Name: Precision Coil Springs. Material: carbon steel, spring steel, alloy steel, etc.. Grade: 4.8 grade, 5.8 grade, 8.8 grade, 10.9 grade
Colck Springs
Standard: DIN43801. Name: Scroll Springs. Material: Carbon steel, spring steel, alloy steel, etc.. Grade: 4.8 grade, 5.8 grade, 8.8 grade, 10.9 grade
Spring Leaf
Name: Spring Plate. Material: carbon steel, spring steel, alloy steel, etc.. Grade: 4.8 grade, 5.8 grade, 8.8 grade. Surface treatment: ZP,YZ,BLACK
General Leaf Springs
Name: Universal leaf spring. Material: carbon steel, spring steel, alloy steel, etc.. Grade: Grade 4.8,5.8,8.8,10.9. Finish: ZP,YZ,BLACK
Wave Springs
Name: Wave Spring. Material: carbon steel, spring steel, alloy steel, etc.. Grade: 4.8 grade, 5.8 grade, 8.8 grade. Surface treatment: ZP,YZ,BLACK
Concial Springs
Standard: DIN2098. Name: Conical Springs. Material: carbon steel, spring steel, alloy steel, etc.. Grade: 4.8 grade, 5.8 grade, 8.8 grade
Torsion Springs
Name: Torsion Spring. Material: carbon steel, spring steel, alloy steel, etc.. Grade: 4.8 grade, 5.8 grade, 8.8 grade. Finish: ZP,YZ,BLACK

Why Choose Us

OEM/ODM Service
Our customised fasteners are made to your special requirements. It can be fully threaded or partially threaded, and the thread, driving method, material, length, head shape, plating and all these can be specially designed according to your needs.

Good CNC machining technology
From material selection to finished products, Handan Sanwei provides you with comprehensive solutions when it comes to customised fasteners. The fasteners we make are high precision and strong. No matter what kind of precision you need, we can meet it and guarantee your satisfaction.

Strong engineering design team
Our company has an excellent and professional engineering team, and a number of technicians are elites in the industry. The staff always strives to explore new methods and technologies. From the selection of metals and special alloy materials to the finished fasteners, we can solve all aspects of the whole project engineering.

Professional Testing Laboratory
Quality assurance and testing is an important part of producing fasteners. Handan Sanwei has a specialised quality testing laboratory with spectrometers, hardness testers, tensile testers, salt spray test chambers and other equipment, where raw materials and final products are strictly tested. In addition, the company also has experienced testing experts who use professional methods to comprehensively test the fasteners and finally give you a detailed test report.

Digital Quality Control System
We rely on our self-developed full-process digital quality inspection system to strictly control every step from raw materials entering the factory to finished products being shipped. This system will always monitor the quality of the products to ensure that each batch of products meets the industry standards and complies with customer requirements. In addition, it collects and feeds back data in real time, giving you a clear understanding of product quality.

Advantages of Spring

Energy Storage
Springs excels at storing energy. When you compress or stretch a spring, it holds onto that energy. It’s like a miniature battery, ready to release its power when needed. This ability makes springs crucial in many mechanical devices.

Shock Absorption
Springs are natural shock absorbers. They can absorb a sudden impact and spread it out over time, protecting other parts of a machine or structure from damage.

Force Control
Springs allow precise force control in many applications. By choosing the correct spring rate, engineers can fine-tune how much force is applied in a system.

Space Efficiency
Springs can pack a lot of functionality into a small space. They can provide force, movement, or energy storage without taking up much room.

Versatility
Springs come in countless shapes and sizes. This variety means there’s likely a spring solution for almost any mechanical challenge.

Specification

Standard	DIN
Name	Spring
Material	Stainless Steel,carbon steel, spring steel, alloy steel, etc.
Grade	4.8 grade, 5.8 grade, 8.8 grade
Wire diameter	M0.3-M10 or as request
Surface treatment	ZP,YZ,BLACK
Size	According to the requirements

Application of Spring

Aerospace industry
In the aerospace industry, precision and reliability are paramount. A spring’s usage ensures the safe and efficient operation of aircraft and spacecraft. Aerospace engineers rely on various types of springs, including compression springs, torsion springs, and helical springs, to meet specific design requirements.

Agriculture
In agriculture, springs find their place in a variety of applications, contributing to the efficiency of farming equipment. Springs are used in plows, harrows, and tillers to provide tension and keep components in their proper positions. Extension springs help manage the tension of belts and chains, ensuring smooth power transmission in agricultural machinery.

Furthermore, springs are essential components in irrigation systems, helping to control valve movements and maintain proper water distribution. Their ability to store and release energy makes them valuable in this industry.

Automotive industry
The automotive industry relies heavily on springs to enhance vehicle performance and safety. One of the most common applications is in suspension systems. Coil springs and leaf springs are used to absorb shocks, provide stability, and ensure a comfortable ride. Torsion springs are found in various automotive components, including doors and trunk lids.

Mechanical watches
Springs also play a role in the operation of mechanical watches. Clock springs store mechanical energy and release it in a controlled manner to power the watch’s movement. This precision is essential to the functioning of these timepieces.

Industrial settings
In industrial settings, springs are ubiquitous. They serve as essential components in various machines and mechanical devices, providing the necessary force and motion control. Springs are used in conveyor systems, assembly machines, and industrial robots to handle and manipulate materials efficiently.

Maintenance and Repair
When it comes to maintenance and repair, springs are often the unsung heroes. They are used to replace worn-out or damaged springs in a wide range of equipment, from vehicles to household appliances. Springs must be carefully selected to match the original specifications to ensure the proper functioning of the repaired equipment.

Types of Spring

Type One: Coiled Springs

Coiled springs, often made by winding a wire around a cylinder, are perhaps the most common type of spring and can be found in countless applications. These springs come in various forms, each serving distinct purposes.
Springs of Compression
Compression springs are designed to resist being compressed, meaning they push back when you press on them. This makes them ideal for applications requiring a resistance to force, such as shock absorbers in vehicles or the retractable ink tip in a ballpoint pen.

Springs of Extension
On the other hand, extension springs are designed to resist being extended, making them perfect for applications requiring a pulling force. You can find these springs in objects like garage doors, trampolines, and even in the retractable cord of a vacuum cleaner.

Springs of Torsion
Torsion springs work a little differently. These springs are designed to resist twisting or rotational movements. They are often used in applications like clothespins, door hinges, and even in the winding mechanism of a mechanical clock.

Spiral Springs
Last but not least, spiral springs, such as those found in traditional watch mechanisms, store and release rotational energy. They are commonly used in applications that require long-term rotational energy storage.

Type Two: Leaf Springs

Leaf springs are made from rectangular metal plates, also known as leaves. The rectangular metal plates are normally bolted and clamped, and they have major use in heavy vehicles. Below are the different types of leaf springs and their applications.
Elliptical Leaf Spring
Connecting two semi-elliptical springs in opposite directions creates an elliptical leaf spring, forming an elliptical shape. In older cars, these springs attached the axle and frame, eliminating the need for shackles, as both semi-elliptical springs elongated equally during compression. However, they are no longer used in modern vehicles.

Semi Elliptical Leaf Spring
These are the most popular leaf springs in automobiles. They are made from steel leaves with different lengths but the same width and thickness. The uppermost/longest leaf at the two ends is the master leaf. The arrangement of the steel leaves resembles a semi-elliptical shape.

Quarter Elliptical Leaf Spring
Also known as the cantilever-type leaf spring, the quarter elliptical leaf spring is also old. They have one end fixed on the side member of the frame with the aid of a U-Clamp or I-Bolt. The other is freely connected to the front axle. When the front axle beam is subjected to a shock load, the leaves straighten to absorb the shock.

Three-quarter Elliptical Leaf Spring
This type combines a quarter elliptical spring and a semi-elliptical spring. One end of the semi-elliptical part attaches to the vehicle frame, while the other connects to the quarter elliptical spring, which is then secured to the frame with an I-bolt.

Transverse Leaf Spring
A transverse leaf spring is created by mounting a semi-elliptical spring across the vehicle’s width. The longest leaf is positioned at the bottom, with the mid-portion fixed to the frame using a U-bolt.

Type Three: Disk Springs

Disk springs are singular or multiple springs stacked together in series or parallel arrangements, allowing them to absorb high loads in tight spaces. Types of disk springs include:
Belleville Disk Spring
Also known as the coned-shaped disk spring, the Belleville disk spring has a cupped construction. They do not lie flat. Instead, they take a canonical shape that compresses and allows them to handle heavy loads.

Curved Disk Spring
Also known as crescent washers, they apply light pressure to their mating par to resist loosening as a result of vibration. They are suitable for distributing loads of threaded bolts, screws, and nuts evenly in machines that produce constant vibration.

Slotted Disk Spring
Slots on the outer and inner diameter of a disc create a slotted disk spring. This design reduces the load and increases deflection, making slotted disk springs widely used in automatic transmissions, clutches, and overload couplings.

Wave Disk Springs
Wave disk springs have multiple waves per turn and are suitable for providing prices and predictable loading. Here, they can act as a cushion by absorbing stress due to axial compression.

Manufacturing Process Of Springs

Since there are spring types and spring washers, multiple treatment and correction procedures turn the spring into its different types. The most common spring manufacturing process is using a wire with a pre-defined inner diameter and winding it.

Before winding starts, spring wire is loaded to the manual or cnc winding machine in rolls. The wire is straightened and fed into the winding machine automatically.

Winding

Winding springs involves taking the fed wire and passing it through guides to a mandrel. The wire is rolled over a mandrel at specific angles with the desired tension. The feed rate and angles is important to match the end spring’s specifications. This process is also called coiling. Once the spring reaches its desired length, it is cut-off from the rest of the wire.

Heat Treating

When the spring is being coiled, it is bent, shaped and deformed. This builds up stresses inside the spring. Residual stresses stay inside the material of the spring and are concentrated at some regions leaving an inconsistent spring rate.

Heat treatment processes like tempering and annealing ensure correct spring stiffness and remove residual stresses. To do this, springs are heated to a fixed temperature and allowed to cool at different rates depending on the material.

Grinding

When a spring is cut off abruptly from the main wire, it does not have smooth or straight ends. In the grinding process a spring is brushed against a grinding tool which spins at moderate RPM.

For large springs, the springs are grinded on a single ended grinder and for smaller sized springs, both ends can be ground simultaneously. The abrasion surface removes layer of spring metal giving it an even size and length for precision.

This gives each batch of springs a good squareness and consistent torsion spring rate. This process is frequent to stock conical springs.

Coating and Finishing

Springs are coated for to improve their properties and performance. In many cases, this also affects the spring rate and mechanical properties. Spring are also electroplated with zinc or copper to improve their rust resistance or conductance. Electropolished springs also have better wear resistance and fatigue resistance.
Powder coating: This is an aesthetic option which provides resistance to moisture and UV protection. Powder coated springs can withstand unintentional abrasion and chipping.

Anodizing: Anodizing is a relatively expensive finishing method for springs. Anodized springs have increased corrosion resistance and surface hardness. It also makes the surface non-conductive for applications in electronics.

Packaging and Shipping

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FAQ

Q: I need a customized fastener, but it's not on your website. What do I do?

A: Please send us your request with detailed drawings or photos, then we will make the quotation for you accordingly.

Q: In general, how long can delivery be made after receiving an order?

A: Regular orders can be completed and shipped within 15-20 working days after receiving the deposit and confirming product details.

Q: During the product usage process, if we encounter technical problems, can you provide technical support?

A: Sure. We have a professional technical team that can provide you with technical consultation and guidance through methods such as telephone, email, or video conference.

Q: What is the packaging method of the product?

A: 50KG bag and pallet.

Q: What is the difference between spring and compression spring?

A: Compression springs differ from extension springs in regards to how they work. While extension springs become longer under a load, compression springs become shorter. Compression springs are designed for use in applications where two components try to push towards each other.

Q: What happens if you compress a spring too much?

A: Excessive compression can cause spring fatigue. This means the spring loses its ability to return to its original shape after compression. This can result in permanent deformation, reduced spring force, and, ultimately, spring failure.

Q: Do springs twist when compressed?

A: Its design features and material properties determine a spring's behavior under compression. Compression springs do not twist when compressed because their axis is straight; however, if you apply an off-center load to a compression spring during compression, some twisting may occur due to unequal forces between coils.

Q: Do springs weaken over time?

A: Yes, springs can weaken over time due to various factors like creep, fatigue, and constant load. When a spring is subjected to continuous stress, whether from compression or other forces, it can experience a gradual loss of tension and its ability to return to its original shape.

Q: How to reinforce a spring?

A: Heat treatment is a widely used process to strengthen springs. The material's internal structure can be modified by subjecting the spring to carefully controlled heating and cooling, enhancing its strength and toughness.

Q: How do you know if a torsion spring is left or right?

A: To determine if a torsion spring is left or right-wound, examine the end of the spring coils. A right-wound spring will have the end of the last coil pointing clockwise, while a left-wound spring will have the end of the last coil pointing counter-clockwise.

We're professional spring manufacturers and suppliers in China, specialized in providing high quality products and service. We warmly welcome you to wholesale customized spring made in China here from our factory. Contact us for quotation.

Stainless Steel Flange Bolts, chemical anchor, Slotted Hex Nut