Extension springs

Other custom springs
What is an extension spring?

What is an extension spring?

Anyone who has ever seen a trampoline up close knows what an extension spring is. Time and again, those springs are subjected to load on their pulling power. The spring stretches until the load is removed and the spring shrinks back to its starting position.
extension springs have attachment 'eyes'. We offer a range of finishings: English eyes (winding runs to the heart of the spring before forming the eye), German eyes (a transformed winding), lateral eyes, loose eyes, loose laser-processed pieces, double eyes, all sorts of eye stems, and so on.
And you should know that each end can be different. Nothing is impossible with Hermans Verenfabriek!

What are applications for extension springs?

Besides trampolines, you find extension springs used in many other types of fitness equipment, as well as in door closers and tensioners for architectural canvas. Agricultural implements, garage doors, ovens and many machines have extension springs too.

How do we make your extension springs?

We use 0.15 mm to 14 mm spring steel quality wire to make extension springs, using, 1.1200, SH - EN 10270-1 (bright spring steel) and 1.4310 (stainless steel spring steel). And we can use other materials too.

In addition to those regular materials, we work a lot with the following:

  • Stainless steel 302 - 1.4310
  • Stainless steel 316 - 1.4401
  • Stainless steel 631 - 1.4568
  • SH - EN 10270-1

We also have a large stock of pre-galvanized materials.

  • We calculate the load for static or dynamic applications. Our tolerances for extension springs comply with DIN 2095. To check performance, we carry out load tests and a statistical process control (SPC). You can obtain a material analysis certificate on request.
  • We will finish your extension springs with English eyes (winding runs to the heart of the spring before forming the eye), German eyes (a transformed winding), lateral eyes, loose eyes, loose laser-processed pieces, double eyes, all sorts of eye stems, and so on.
  • We can deliver your extension springs in any shape and size.
Order your extension springs now
Request a quote