China Customized Coil Springs Manufacturers Suppliers Factory - Wholesale Service

Sanwei:Your Professional Coil Springs 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

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 Coil Springs

Lightweight Construction: Coil springs are lightweight yet powerful. The coiled shape adds strength to the spring, enabling it to bear heavier weights with less material.

Maintenance-Free Design: The simple design and mechanism of coil springs eliminate the need for frequent maintenance. They resist compression and stretching based on their material and winding tightness and do not require lubrication or cleaning.

Versatility: Coil springs can be customized in shape, size, and strength to meet specific needs. They can be manufactured to tight tolerances to fit precisely around shafts or in holes.

Simple Installation: Installing a coil spring is often straightforward.You just need the right tools and a little know-how. Many DIY enthusiasts find coil springs easier to work with than other types. This simplicity can save time and money.

Durability: Coil springs are built to last.They can handle a lot of stress without breaking. Made from robust materials, they can withstand heavy use. This durability means fewer replacements and less waste.

Application of Coil Springs

Automotive Industry
In the automotive industry, coil springs are used in car suspension systems to ensure vehicle stability, shock absorption, and comfort. They are designed to withstand the repetitiveness of daily use and harsh driving conditions across every vehicle type from domestic cars to heavy-duty trucks, buses, and off-road vehicles. Other uses include seat mechanisms, clutch assemblies, brake systems, engine valves and vibration dampening to reduce noise inside the vehicle.

Construction Equipment
Construction equipment relies on coil springs for vibration control and operational efficiency. They are used in machinery such as bulldozers, excavators, and cranes to absorb shocks, maintain equipment alignment, and reduce wear and tear, ensuring reliability and safety on construction sites. Other common types of uses include concrete mixers, truck tailgates and vibrating screens and feeders.

Agricultural Machinery
Agricultural machinery, including tractors, combines, and ploughs, use coil springs to manage the uneven terrain and heavy loads. They maintain stability, improve ride quality, and extend the lifespan of machinery in demanding environments. Other uses include tractor seats, baler machinery, and sprayer arms for crops.

Firearms Uses
Coil springs are essential components in firearms, found in magazine springs, trigger springs, and recoil springs. In detonators, they are compressed and held in a flattened state until activation. Their reliability and durability make them suitable for the constant use demanded by loaded weapons.

Residential Use
The average home contains a multitude of coil springs in nearly every room. They are found in mattresses, chairs, and couches to provide support and absorb impact. Modern children’s toys use springs to activate their functions and keep them operational. Coil springs are also crucial in switches, garage door openers, cabinets, appliances, and countless other applications. In many ways, homes rely heavily on coil springs for smooth and effortless living.

Springs in Pens
Compression coil springs are employed to extend and retract the ballpoint of a pen. These springs need to be elastic enough to compress to a solid height. For proper functionality, the spring must have a suitable index and an adequate number of coils relative to its free length and wire diameter. Generally, a larger diameter and more coils result in a lighter spring.

Specification

Standard	DIN
Name	Coil Springs
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

Types of Coil Springs

Compression Springs
Compression springs store and release energy when subjected to a compressive force. As the spring compresses, it stores energy within its structure. When the force is removed, energy is released, and the spring expands to its original length. In their original state, compression spring coils have space between them; they absorb shock and maintain force between components.

Tension Springs
This type of spring, also known as an extension spring, works by resisting a pulling force. It absorbs and stores energy as it extends and then at a certain length, will create a return force and bring two components back to their original position. In their original, unloaded state, the adjacent coils will touch each other - however, the initial tension must be overcome before a tension spring extends.

Torsion Springs
Torsion springs function by applying torque or rotational force. They activate when a force is applied to their arms, twisting the spring. The energy stored during this twisting motion is released as the spring returns to its original position. They are ideal for applications requiring controlled, rotational movements.

Manufacturing Process of Coil Springs

Material Selection
Common spring materials include stainless steel, carbon steel, chrome silicon, chrome vanadium, and speciality materials such as Inconel, elgiloy, and titanium. Non-ferrous metals such as phosphor bronze and beryllium copper may also be used.

Design and Engineering of Coil Springs
The next step is to calculate the spring specifications, using formulas to determine dimensions, load capacities, spring rates and the spring constant. These calculations ensure the spring can withstand the operational stressors without buckling or experiencing permanent deformation. Engineers also consider space constraints and may conduct simulations to predict the spring's behaviour under different loads and conditions.

The Winding Process
The coiling winding process is a fundamental step in coil spring manufacturing. It involves shaping metal wire into the desired coil form. This process requires precision and control to ensure the resulting spring meets all requirements, including diameter, pitch, and the total number of coils.

Cold Winding vs. Hot Winding
Two primary methods are used in the winding process: cold and hot coiling. The choice of a hot or cold coil is predominantly determined by the wire size that needs to be coiled. Cold winding is performed at room temperature and is typically used for wire diameters up to about 26mm. It allows for high precision and is suitable for most industrial applications. On the other hand, hot winding involves heating the metal before winding (up to 900 degrees celsius) and is used for larger diameters.

Heat Treatment
Heat treatment modifies the coil spring material’s microstructure and improves its mechanical properties. These enhancements include tensile strength, hardness, durability, and resistance to fatigue.

Common heat treatment methods include annealing, quenching, and tempering, which achieve the desired level of hardness and elasticity. Advanced techniques like cryogenic treatment may further enhance the spring's wear resistance and durability.

Surface Treatment and Finishing
Surface treatments improve aesthetic appearance and significantly extend a spring's lifespan. These treatments include painting, galvanising, phosphating, coating with nickel, zinc, and epoxy materials, and plating with metals such as chrome. These methods create protective barriers and modify the surface properties of a spring, minimising corrosion and improving a spring's performance.

Quality Assurance and Testing
The final step is quality assurance and testing. Standard tests for coil springs include load testing, fatigue testing, and dimensional checks. These tests assess the spring's ability to handle specified stresses, its durability over repeated use cycles, and whether its dimensions align with design specifications.

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: Can Coil Springs Be Welded?

A: Due to the critical nature of the metallurgy of coil springs, we will never recommend that a user weld on or to a coil spring. The welding will heat the spring material and damage the grain structure and alter the local metallurgy of the spring. Additionally, due to the chemical composition of the spring steel, the weld will not fully integrate with the spring steel and will fail easily.

Q: How long do coil springs last?

A: The longevity of a coil spring largely depends on its use and the environment. In general, coil springs in standard automotive applications can last between 50,000 to 100,000 miles. However, exposure to extreme stress or corrosive elements May reduce their lifespan.In other applications, coil spring lifespan will depend heavily on the type of spring (compression, extension, torsion, etc) as well as on the material, tolerances, and other technical specifications for the springs.

Q: Do coil springs sag over time?

A: Yes, coil springs do sag over time due to a combination of factors, including material fatigue and continuous stress from vehicle operation. This leads to a decrease in spring height and a noticeable drop in ride height, which can negatively impact handling and vehicle stability.

Q: Does it matter which way a coil spring is installed?

A: Yes, the coil direction of your spring does make a difference. It won't change the performance or lifespan of a spring, but it will determine if it will be able to be installed in specific types of products or applications.

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

A: Unlike compression and tension springs, torsion springs are designed to resist twisting or rotational forces. They store mechanical energy by twisting or rotating around an axis.

Q: What are coil springs coated with?

A: Powder coating is the best coating for heavy-duty coil springs. However, zinc and epoxy are also popular coatings that enhance corrosion resistance.

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

coil springs, spring