What Are Extension Springs?
Extension springs – also called tension springs – are tightly wound helical springs designed to store energy when pulled apart. These springs apply a resistive force as they extend, returning to their original position when the load is released. Each spring is manufactured to perform under precise force requirements, cycles, and environmental demands.
Technical Specifications
| Specification | Range / Options |
|---|---|
| Wire Diameter | 0.1 mm – 25.4 mm |
| Outer Diameter | Application Dependent |
| Free Length | Manufactured per drawing |
| Ends / Hooks | Machine loop, crossover hook, extended loop, custom formed |
| Tolerances | BS1726 / customer-specific |
| Surface Finishes | Zinc plating, passivation, shot-peening, special coatings |
| Spring Types | Cylindrical, conical, hourglass, barrel |
Material Options:
Stainless Steel (302, 316, 17-7 PH), Inconel, Phosphor Bronze, Carbon Steel, Super Duplex, Hastelloy, plus all four NACE spring material and others upon request.
Applications by Industry:
Aerospace & Defence: Control surfaces, payload deployment, damping
Industrial Automation: Actuators, control mechanisms, robotics
Medical: Surgical tool tension components, precision instruments
Automotive: Throttle return, flat return, suspension auxiliaries
Oil & Gas: Valve return systems, downhole tool components
Find out more about our industries
Quality Assurance & Engineering Support
Springtech is AS 9100 D & BS EN ISO 9001: 2015 certified and follows stringent quality procedures. Every spring is manufactured under traceable controls, with the option for:
- Shot-peening for fatigue life enhancement
- Design validation through simulation and load testing
- Material certification and compliance documentation
- First Article Inspection Reports (FAIR) upon request
- In-process and final dimensional inspection
Why Springtech?
We supply fully engineered, application-specific extension springs, every component is manufactured to deliver exceptional performance in demanding environments. All of our springs are produced onsite at our advanced facility in High Wycombe, supported by a dedicated engineering and validation centre.
Our experienced team works collaboratively with customers to ensure each spring exceeds its lifecycle requirements, with careful attention to load conditions, fatigue performance, material suitability, and dimensional tolerances. We’re trusted by industry leaders across aerospace, defence, oil & gas, and medical sectors for our technical capability and reliable production standards.
With in-house design support, material traceability, and rigorous validation procedures including shot-peening, first article inspection, and tailored fatigue testing. Springtech delivers precision extension springs you can depend on.