Precision Extension Springs: Engineered for Tensile Force & Motion Control
This comprehensive display from Zhejiang Zhengna Technology Co., Ltd. highlights our extensive capabilities in manufacturing high-quality extension (tension) springs. The assortment features a wide range of sizes, coil densities, and end configurations—from standard full loops to specialized hooks and custom bends. With finishes including bright zinc, black oxide, and others, these springs are designed to provide reliable, consistent tensile force in countless applications, from industrial machinery to consumer products.
Image: A collection of precision extension springs in various sizes and configurations, showcasing different hook styles (full loop, reduced loop, side hooks) and protective finishes.
Product Specifications & Design Flexibility
| Design Aspect |
Available Options & Specifications |
Application Advantage |
| Material & Wire Type |
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High-Carbon Steel (Music Wire): Most common, excellent strength and fatigue life.
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Stainless Steel (302, 316): For corrosion or high-temperature resistance.
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Oil-Tempered Wire: For heavy-duty applications.
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Copper Alloys (Phosphor Bronze): For non-magnetic or conductive needs.
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Material selection is based on your application's load, environmental, and longevity requirements. |
| End Configurations |
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Standard Hooks: Full loop, reduced loop, cross-center.
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Special Hooks: Side hooks, extended hooks, German hooks (as pictured).
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Threaded Ends / Custom Bends: For specific attachment needs.
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Ends are designed for secure attachment, optimal force alignment, and to minimize stress concentration. |
| Spring Geometry |
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Wire Diameter: From fine (0.5mm) to heavy gauge (5mm+).
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Coil Diameter & Length: Fully customizable to your space and stroke requirements.
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Initial Tension: Can be engineered to require a specific force to begin extension.
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Every dimension is calculated to deliver the precise force and deflection needed for your mechanism. |
| Surface Finish |
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Zinc Plating (Bright/Blue): Standard corrosion protection.
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Black Oxide/Powder Coat: For appearance or added protection (as shown on black spring).
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Passivation (SS): For stainless steel springs.
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Electropolishing: For clean, deburred surfaces.
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Protects against corrosion, reduces friction, and can meet aesthetic requirements. |
| Common Applications |
Garage Door Systems, Agricultural Equipment, Exercise Machines, Automotive Interiors, Electronic Hatch Latches, Toys, and countless return/balance mechanisms. |
Versatile components for creating motion, counterbalancing weight, or providing a return force. |
Why Partner with Zhejiang Zhengna Technology for Extension Springs?
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Wide Design & Production Range: As shown, we produce springs in a vast array of sizes and styles. We can manufacture from small, precise springs for electronics to large, heavy-duty springs for industrial use.
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Engineering for Performance & Life: We calculate the optimal design to meet your load, deflection, and cycle life requirements, focusing on stress distribution at the hooks—a critical failure point.
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Customization is Standard: We don't just sell catalog items. We customize the wire, coil, hook, and finish to integrate perfectly into your specific assembly.
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Consistent Quality Across Batches: Our advanced coiling equipment and strict process control ensure that every spring delivers identical force characteristics, batch after batch, which is crucial for automated assembly.
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Full Technical Support: From prototype to production, we provide support on material selection, end configuration, and testing to ensure your spring performs as intended.
Our Development and Manufacturing Process
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Requirement Analysis: We determine the needed initial tension, spring rate, maximum extension, and end configuration based on your application.
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Design & Prototyping: Our engineers create a spring design and can provide samples for functional testing and fit-check.
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Precision Coiling & End Forming: Utilizing CNC spring coilers and formers to create the body and precisely shape the hooks for maximum durability.
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Heat Treatment & Finishing: Applying stress relief and tempering, followed by the specified surface treatment for protection.
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Rigorous Testing: Samples undergo load-deflection testing and cycle life testing to validate performance before full-scale production.
Need a reliable extension spring for your design? Send us your force, space, and environmental requirements for a free spring calculation and quotation.
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