Extension Springs for Energy Storage and Tension Control in Mechanical Systems
When designing systems that require tension control, elastic energy storage, or reliable force regulation, Extension Springs are often the ideal solution. These versatile components are essential in engines, automated systems, and consumer products where stretching and recoiling forces need to be carefully managed.
At Dongguan Sango Hardware Fasteners Co., Ltd., we specialize in the manufacturing of custom extension springs that provide the reliable tension control and energy storage needed for your mechanical systems.
1. What Is an Extension Spring?
An Extension Spring is a type of spring that is designed to absorb and store tensile energy. It works by resisting a stretching force and returning to its original length once the force is removed. These springs are designed to expand under a pulling force and contract when the force is released.
🔩 Key Benefits:
- Energy storage for controlled release
- Tension control for balance and stability
- Durable and reliable under tension
- Space-efficient and adaptable for a wide range of applications
- Available in custom lengths, diameters, and spring rates
2. Types of Extension Springs
🔹 Standard Extension Spring
- Regular cylindrical shape with loops at both ends
- Common in door mechanisms, sprinkler systems, and industrial applications
🔹 Tapered Extension Spring
- Tapered design to provide progressive tension
- Ideal for automotive suspension systems and high-load environments
🔹 Double-Torsion Extension Spring
- Combines torsion spring and extension spring features
- Used in latch mechanisms, grip systems, and mechanical timers
🔹 Heavy-Duty Extension Spring
- Designed for high tensile load and heavy-duty machinery
- Often used in agricultural machinery or industrial press systems
🔹 Miniature Extension Spring
- Compact size and lightweight design
- Used in medical devices, electronics, and precision instruments
3. Applications of Extension Springs
Extension springs are essential in systems requiring precise tension control and energy storage. Common applications include:
- 🚗 Automotive suspension systems
- 🛠 Power tools and hand tools
- 🧪 Medical devices and laboratory equipment
- 📦 Packaging machines, conveyor systems
- 🔒 Locking mechanisms and safety devices
- 🎮 Toys, fitness equipment, and exercise machines
These springs are integral to load balancing, positioning control, and system safety across multiple industries.
4. Material and Finish Options
| Material | Benefits | Best Applications |
|---|---|---|
| Stainless Steel | Corrosion-resistant, high strength | Food processing, medical equipment |
| Carbon Steel | High tensile strength, cost-effective | Automotive, industrial machinery |
| Spring Steel | Excellent for high-cycle applications | Heavy-duty machinery, compression systems |
| Brass | Non-corrosive, low friction | Precision applications, light loads |
| Phosphor Bronze | Elasticity, corrosion resistance | Electronics, small mechanisms |
Finish options:
- Passivated stainless steel for rust resistance
- Powder coating for added durability and color coding
- Electroplating (zinc, nickel) for corrosion protection
- Black oxide or phosphate coating for industrial use
5. Customization from Sango Hardware
We offer:
- 📏 Spring diameters: 0.5mm to 25mm
- 📐 Free length: 5mm to 200mm
- 🧩 Material types: Stainless steel, carbon steel, spring steel, brass
- ⚙️ Spring rate: Custom-designed to fit load specifications
- 🔩 End types: Extended hook, machine eye, double loops
- 🧪 Surface treatments: Zinc plating, nickel plating, powder coating, black oxide
Additionally, we provide CAD models, custom packaging, and engineering services to meet your design needs.
6. Case Study: Extension Springs for Automatic Door Mechanism
Client: U.S.-based manufacturer of automated doors for commercial buildings
Problem: Existing spring designs were causing premature wear in high-traffic areas
Sango Solution:
- Delivered custom M6 × 70mm extension springs with closed ends
- Material: Stainless steel 302 for high tensile strength and corrosion resistance
- Provided tensile load testing and force calculation sheets
Result:
- Increased spring lifespan by 50%
- Improved overall system reliability and reduced downtime
- Expanded use of custom extension springs across all automatic door designs
7. Why Choose Sango Hardware for Extension Springs?
🏭 Precision Manufacturing
- CNC spring winding, heat treatment, and grinding for custom load ratings
🧪 Quality Assurance
- Tensile, cycle life, and dimensional checks on every batch
📐 Engineering Support
- Customized spring rate, length, and material for your unique applications
📦 OEM/Export Ready
- RoHS, REACH compliant, English documentation, custom labeling, bulk or retail packaging
8. Conclusion: The Right Spring for the Right Application
Whether you need tension control, energy storage, or shock absorption, Extension Springs are an essential component for your mechanical systems. With customizable options in material, size, and force rating, these springs provide reliable performance in even the most demanding environments.
Contact Dongguan Sango Hardware Fasteners Co., Ltd. today to discover how our extension springs can improve the functionality and durability of your products.