Extension Springs | Produced In Electrogalvanised Spring Steel

DIN 17223 C-Wire WERKSTOFF NO. 1.200
Working temperature between -30 ºC and +120 ºC

The galvanised range is manufactured of electro-galvanised music wire. Electro-galvanisation means that the spring gets a blank and more corrosion resistant surface.

Fn for stainless steel spring steel is approx. 0.88 x Fn for music wire.

Calculation of the initial force (F0):
The initial force F0 or the initial tension is for guidance only due to differing production processes.
F0 = Fn - (R * Sn). A rule of thumb is however that F0 is 10-15% of Fn.

For example, for stock number 32600, Fn = 237 N, R = 2,67N/mm og Sn = 75,70mm. F0 = 237N - (2,67N/mm * 75,70mm) = 237N - 202N = 35N

The calculation of spring force for a given length:
Calculation of spring force at a given length is: F0 + (travel * R).
For example, for stock number 32600 where R = 2.67 N/mm, the desired travel is 55 mm and F0 is approx. 35 N. 35N + (55mm * 2,67N/mm) = 35N + 147N = 182N

Normally right-handed

Standard springs are not defined with a specific direction of wind. Depending on production, the springs may be produced either right or left wound. If you require a specific direction of wind a special spring must be produced.

If an extension spring with an exact value for one of the following parameters is required, springs must be custom-made:
- Loop type
- Loop height (LH)
- Loop position (X)
- Loop width (if the spring is to be incorporated into a tube)
- Opening at loop (m)
- Initial force (F0)