Custom Extension Springs Manufacturer
Custom-made extension springs tailored to your specific specifications. Discover Filame's deep expertise, production capabilities, sector expertise, materials and finishings.
The extension spring is generally intended to operate by extension and is therefore the opposite of the compression spring.
This is calculated as a compression spring possibly taking a prestressing force into account called initial tension. Extension springs are generally cylindrical in shape and can be differentiated by the variety of hooks that can be formed at their ends (English hooks, German hooks, elongated hooks, etc.).
Available in all dimensions and qualities from 0.1 to 8 mm in wire thickness in small, medium or large series. Extension springs are available only up to 20 mm in small and medium series.
Design Your Spring
Use Filame’s interactive calculation tool to size and preview your spring. Compute rates, loads, Wahl stress corrections, and submit verified parameters for rapid quoting.
Technical Specifications
- Wire thickness: 0.1 mm to 8 mm (standard), up to 20 mm (special small/medium series).
- Hooks: English, German, elongated, and custom designs.
- Materials: Carbon steel, stainless steel (1.4310, 1.4401), Inconel, and more.
- Standards: Manufactured according to EN 13906-2.
Worked Steels
- SM, SH, DH grade spring steel, ...
- Pre-coated galvanised SM grade, galvanised SH grade, Bezinal © SM grade and Bezinal © SH grade steel
- Oteva © silicon-chrome oil-tempered steel
- Stainless steel 1.4310, 1.4310 HS, 1.4401, 1.4568, 1.4462, 17/7 PH
- Low-carbon stainless steel 1.4301
- 1.4441 implant grade stainless steel
- Inconel 600, 625, 718, 750
- Monel, Nimonic, Elgiloy …
Finishings
- Pre-stressed shot peening
- Oiling
- Zinc plating
- Cataphoresis
- Teflon © coating
- Geomet © coating
- Passivation
- Phosphate treatment
- Colour coding
- Marking
- Ultrasonic cleaning
- Unit packaging in sachets, etc.
Product samples
Industries we serve
The Filame Group manufactures precision components for a wide range of industries. Discover the main sectors we serve:
We also serve many other sectors. For more details on all of our industry services, visit our Industries & customers page, or contact us for any custom requests.