What we wind / Extension springs
Extension springs
Pulls back when stretched
Tightly wound so the coils press on each other at rest. That built-in squeeze, the initial tension, is the load you must pass before it starts to stretch.
| Wire | 0.3 to 5.0 mm |
|---|---|
| Size | Outside diameter 3 to 50 mm, body up to 250 mm |
| Materials | Music wire, 302 and 316 stainless, oil-tempered and chrome silicon for heat |
| Finishes | Plain and oiled, zinc, passivated, black oxide |
| Quantities | One prototype to production runs |
Options
- Machine hooks, the everyday choice
- Crossover hooks, for a lower stress point
- Extended or offset hooks to reach an anchor
- Initial tension set to your number
Where you'll find them: Garage and trailer doors, lever returns, tensioners, gym kit.
Before you send a drawing
- Is there a minimum order?
- Not for samples: one spring is fine. Production runs usually start at a few hundred, because setting a coiler takes the same hour whether it makes ten or ten thousand.
- What tolerances do you hold?
- EN 15800 grade 2 for compression springs unless your drawing asks for tighter. Tell us which dimension matters most and we hold that one closest.
- Will you sign our NDA?
- Yes, before you send the drawing. Yours or ours. Drawings stay on our server and nobody outside the works sees them.
Four answers get you a quote
Load and travel, the space it lives in, where it works, and how many. A drawing helps; a used sample also works.