Introducing Bosswinn Tension Springs: Engineered for Reliable Force and Controlled Motion

At Zhuji Bosswinn Springs Co., Ltd. , we are dedicated to the research, development, and precision manufacturing of high-quality metal hardware accessories, serving industries from automotive and home appliances to electronics and industrial machinery. Within our comprehensive range of spring solutions, our Tension Springs (also known as extension springs) stand as a testament to our commitment to engineering excellence. These springs are expertly designed to provide a precise, controlled pulling force, making them indispensable components in countless applications where reliable energy storage and restoration are paramount.

What is a Tension Spring?

A tension spring is a type of open-coil helical spring designed to absorb and store energy by resisting a pulling force. Unlike compression springs which are pushed together, tension springs are actuated by being pulled apart. They are characterized by their tightly wound coils, which are typically in contact with one another in their free state, creating what is known as initial tension. This initial tension is the force required to just begin separating the coils. When a load is applied, the spring stretches, storing mechanical energy, and upon release of the force, it powerfully retracts to its original shape and length, creating a sling back effect. To facilitate this pulling action, tension springs are almost always fitted with some form of end attachment, such as hooks, loops, or eyes.

Unmatched Advantages in Design and Function

The primary advantage of Bosswinn's tension springs lies in their ability to provide a consistent and reliable pulling force across a wide range of industries. They are engineered to handle significant loads and repetitive stress cycles without failure. Their tightly wound design ensures a high degree of initial tension, allowing for precise control in mechanisms that require a specific starting force.

Furthermore, the versatility in end configurations—from simple machine hooks and cross-over hooks to full loops and right-angle extensions—allows our springs to be seamlessly integrated into virtually any assembly, providing engineers with flexible design solutions. Whether the need is for a tiny spring in a delicate electronic device or a heavy-duty spring in a vehicle suspension system, Bosswinn's tension springs offer the perfect balance of strength, flexibility, and durability.

Precision Engineering and Manufacturing with Key Physical Parameters

At Bosswinn, our tension springs are born from a meticulous manufacturing process that ensures durability and peak performance. With over 30 years of experience in spring production, we utilize high-quality materials, typically steel alloys selected for their specific mechanical properties, including high-carbon steel, music wire, and various alloy steels. Our production process incorporates advanced CNC processing and rigorous heat treatment to enhance the springs' fatigue life and resilience, ensuring they meet the highest international standards.

Our manufacturing capabilities are defined by precise physical parameters to meet exact customer specifications:

• Wire Diameter: We can produce springs from wires with a diameter as small as 0.1mm up to 8mm, offering flexibility for both micro-electronic components and heavy-duty industrial applications.

• Material Options: We work with a wide range of materials, including music wire (carbon steel), stainless steel, and alloy steels such as 51CrV4, SEA9260/9254, and SUP grades. Our commitment to material science is further demonstrated by our proprietary high-strength steel wire, which offers 30% higher strength and 2X longer fatigue life compared to standard steels.

• Custom Dimensions: We manufacture springs to specific customer requirements, offering various end types (e.g., dual hooks, full loops) and precisely controlling the outer diameter and free length to ensure perfect integration into any assembly. A representative example of our precision is a small dual-hook tension spring with a wire diameter of 1.2 mm (0.05 inches) , an outer diameter of 10 mm (0.39 inches) , and a free length of 65 mm (2.54 inches) .

• Surface Treatment: To enhance corrosion resistance and durability, we offer multiple surface treatment options such as electroplating, painting, polishing, and blackening. Our standard small springs often feature a dry feel oil surface for added corrosion protection.

• Quality Certifications: Our commitment to quality is backed by ISO 9001:2015, ISO/TS16949, and ISO14000 certifications, ensuring every spring meets strict industry standards.

Versatile Applications Across Industries

The unique characteristics of Bosswinn's tension springs make them the preferred choice for a wide array of applications. You will find our springs at work in:

• Automotive and Transportation: Used in vehicle suspension systems, braking mechanisms, and heavy-duty assemblies where high pulling strength is required.

• Recreation and Fitness: The hundreds of hook-end extension springs on a trampoline that form the jumping surface are a classic example. They are also common in exercise equipment like chest expanders.

• Home Appliances and Furniture: Essential components in washing machines to suspend the drum, as well as in furniture, doors, and windows to help them close smoothly and securely.

• Industrial and Agricultural Machinery: Used in materials handling equipment, agricultural machines, and petrochemical facilities for load dispersal and mechanical control.

• Electronics and Small Devices: Providing reliable return forces in toys, small electronics, and precision instruments, ensuring functionality in tight spaces.