Extension Springs - Spring Steel / Music Wire

Technical drawing - Extension spring - Range ABC
This category consists of two different ranges. Due to differing dimensions, the two ranges complement each other very well. We have opted to collect them together into one. Range A is a European standard, while ranges B is an American series. This category is also available in stainless steel. Please note that stainless steel springs are 10% weaker than the corresponding springs in piano wire.

28-70014-description

Music wire

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Shopping Options
d - Wire diameter (in)
De - External diameter (in)
L0 - Unloaded length (in)
Ln - Max. loaded length (in)
Sn - Maximum travel (in)
Fn - Maximum load at Ln (lbs)
F0 - Initial force (lbs)
R - Spring constant (lb/in)

Items 1-10 of 1324

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View prices - Add to Cart Material d
Wire diameter (in)
De
External diameter (in)
L0
Unloaded length (in)
Ln
Max. loaded length (in)
Sn
Maximum travel (in)
Fn
Maximum load at Ln (lbs)
F0
Initial force (lbs)
R
Spring constant (lb/in)
Range SKU Stock Tech Drawing Read More 3D CAD
Music wire 0.0071 0.0630 0.2500 0.5402 0.2902 0.3192 0.0292 1.0278 B E00630070250M E00630070250M
Music wire 0.0071 0.0630 0.3098 0.7299 0.4201 0.3192 0.0292 0.6852 B E00630070310M E00630070310M
Music wire 0.0071 0.0630 0.3799 0.9299 0.5500 0.3192 0.0292 0.5139 B E00630070380M E00630070380M
Music wire 0.0071 0.0630 0.4402 1.1201 0.6799 0.3192 0.0292 0.3997 B E00630070440M E00630070440M
Music wire 0.0071 0.0630 0.5000 1.3098 0.8098 0.3192 0.0292 0.3997 B E00630070500M E00630070500M
Music wire 0.0079 0.0630 0.2500 0.4598 0.2098 0.4496 0.0405 1.9986 B E00630080250M E00630080250M
Music wire 0.0079 0.0630 0.3098 0.6000 0.2902 0.4496 0.0405 1.4275 B E00630080310M E00630080310M
Music wire 0.0079 0.0630 0.3799 0.7500 0.3701 0.4496 0.0405 1.0849 B E00630080380M E00630080380M
Music wire 0.0079 0.0630 0.4402 0.9098 0.4697 0.4496 0.0405 0.9136 B E00630080440M E00630080440M
Music wire 0.0079 0.0630 0.5000 1.0500 0.5500 0.4496 0.0405 0.6852 B E00630080500M E00630080500M
  1. E00630070250M
    In stock: 343
    Material Music wire
    d - Wire diameter (in) 0.0071
    De - External diameter (in) 0.0630
    L0 - Unloaded length (in) 0.2500
    Ln - Max. loaded length (in) 0.5402
    Sn - Maximum travel (in) 0.2902
    Fn - Maximum load at Ln (lbs) 0.3192
    F0 - Initial force (lbs) 0.0292
    R - Spring constant (lb/in) 1.0278
    Range B
  2. E00630070310M
    In stock: 510
    Material Music wire
    d - Wire diameter (in) 0.0071
    De - External diameter (in) 0.0630
    L0 - Unloaded length (in) 0.3098
    Ln - Max. loaded length (in) 0.7299
    Sn - Maximum travel (in) 0.4201
    Fn - Maximum load at Ln (lbs) 0.3192
    F0 - Initial force (lbs) 0.0292
    R - Spring constant (lb/in) 0.6852
    Range B
  3. E00630070380M
    In stock: 225
    Material Music wire
    d - Wire diameter (in) 0.0071
    De - External diameter (in) 0.0630
    L0 - Unloaded length (in) 0.3799
    Ln - Max. loaded length (in) 0.9299
    Sn - Maximum travel (in) 0.5500
    Fn - Maximum load at Ln (lbs) 0.3192
    F0 - Initial force (lbs) 0.0292
    R - Spring constant (lb/in) 0.5139
    Range B
  4. E00630070440M
    In stock: 57
    Material Music wire
    d - Wire diameter (in) 0.0071
    De - External diameter (in) 0.0630
    L0 - Unloaded length (in) 0.4402
    Ln - Max. loaded length (in) 1.1201
    Sn - Maximum travel (in) 0.6799
    Fn - Maximum load at Ln (lbs) 0.3192
    F0 - Initial force (lbs) 0.0292
    R - Spring constant (lb/in) 0.3997
    Range B
  5. E00630070500M
    In stock: 3,317
    Material Music wire
    d - Wire diameter (in) 0.0071
    De - External diameter (in) 0.0630
    L0 - Unloaded length (in) 0.5000
    Ln - Max. loaded length (in) 1.3098
    Sn - Maximum travel (in) 0.8098
    Fn - Maximum load at Ln (lbs) 0.3192
    F0 - Initial force (lbs) 0.0292
    R - Spring constant (lb/in) 0.3997
    Range B
  6. E00630080250M
    In stock: 4
    Material Music wire
    d - Wire diameter (in) 0.0079
    De - External diameter (in) 0.0630
    L0 - Unloaded length (in) 0.2500
    Ln - Max. loaded length (in) 0.4598
    Sn - Maximum travel (in) 0.2098
    Fn - Maximum load at Ln (lbs) 0.4496
    F0 - Initial force (lbs) 0.0405
    R - Spring constant (lb/in) 1.9986
    Range B
  7. E00630080310M
    In stock: 154
    Material Music wire
    d - Wire diameter (in) 0.0079
    De - External diameter (in) 0.0630
    L0 - Unloaded length (in) 0.3098
    Ln - Max. loaded length (in) 0.6000
    Sn - Maximum travel (in) 0.2902
    Fn - Maximum load at Ln (lbs) 0.4496
    F0 - Initial force (lbs) 0.0405
    R - Spring constant (lb/in) 1.4275
    Range B
  8. E00630080380M
    In stock: 248
    Material Music wire
    d - Wire diameter (in) 0.0079
    De - External diameter (in) 0.0630
    L0 - Unloaded length (in) 0.3799
    Ln - Max. loaded length (in) 0.7500
    Sn - Maximum travel (in) 0.3701
    Fn - Maximum load at Ln (lbs) 0.4496
    F0 - Initial force (lbs) 0.0405
    R - Spring constant (lb/in) 1.0849
    Range B
  9. E00630080440M
    In stock: 214
    Material Music wire
    d - Wire diameter (in) 0.0079
    De - External diameter (in) 0.0630
    L0 - Unloaded length (in) 0.4402
    Ln - Max. loaded length (in) 0.9098
    Sn - Maximum travel (in) 0.4697
    Fn - Maximum load at Ln (lbs) 0.4496
    F0 - Initial force (lbs) 0.0405
    R - Spring constant (lb/in) 0.9136
    Range B
  10. E00630080500M
    In stock: 34
    Material Music wire
    d - Wire diameter (in) 0.0079
    De - External diameter (in) 0.0630
    L0 - Unloaded length (in) 0.5000
    Ln - Max. loaded length (in) 1.0500
    Sn - Maximum travel (in) 0.5500
    Fn - Maximum load at Ln (lbs) 0.4496
    F0 - Initial force (lbs) 0.0405
    R - Spring constant (lb/in) 0.6852
    Range B
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Material

DIN 17223 C-Wire WERKSTOFF NO. 1.200
Working temperature between -30 ºC and +120 ºC.
Produced in spring steel for use in dry environment. The spring steel is not rust-resistant.
If needed for use in humid/wet environment, choose from our collection of models in stainless steel here.

Tolerances

Range A: (The A Range consists of springs with 5 digits, ie: "32200")

All dimensions and forces in accordance with DIN 2097 (Grade 2). DIN 2097 defines the force as the determining parameter. The number of coils may therefore vary and is consequently not stated for these ranges.

Range B: (The B Range consists of springs with 11 digits and 2 letters, ie: "E03600552000M")

For more information, contact Sodemann-Springs.US

Calculation of spring force

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

Loops

Range A:Closed German loops in accordance with DIN 2097, random angle.

Tolerance at loop height (LH) is from 0.8 to 1.1 * Dm. The loop position (X) is variable and the loops can therefore be turned in relation to one another. The diameter of loops may well exceed the external diameter of the body. The tolerance for deviations is determined based on the definition below.

Coil ratio (dm/d)
Gütegrad 2
0mm - 6mm
d
6mm - 12mm
1,5 * d
12mm +
By agreement or by choice of production


Example: Stock number 32600 has a wire thickness of 2.5 mm. The external diameter is 18 mm, which produces a mean diameter of 15.5 mm. From the table above, we can determine how wide the loop must be. First we must work out the coil ratio using the formula Dm/d. The loop width can then be determined using the table above.
Coil ratio: 15.5 mm/2.5 mm = 6.2 mm
Loop width: 18 mm + (1.5 * 2.5 mm) = 21.75 mm

Range B: Loops in this range are closed loops without a specific loop shape and with a random angle. Every effort is made to keep the same external diameter as the spring body. However, the external diameter of the loop may vary.

Winding direction

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.

Misc.

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)

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