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Extension Springs | Produced In Spring Steel (Music wire)

Technical drawing - Extension spring - Range ABC

Range A&B. Over 1,000 dimensions in stock. All extension springs produced of the highest quality in Europe and America.

Find the correct dimensions by using the filters underneath. Open the filters by clicking the downward arrow.
If you know the stock-number, please write it in the search box at the top of the page.

See quantity discount by clicking on the green basket next to the item.
We can deliver within 24 hours, if you order before 15:45 from Monday till Thursday and before 14:30 on Fridays, if the item is in stock. Orders placed Saturday and Sunday are being shipped the following Monday.

About the spring
This range consists of two different series. Due to differing dimensions, the two series complement each other very well. We have therefore opted to collect them together into one. Series A is a European standard, while series B is an American standard. Both series are of the highest quality and both listed in metrics.

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28-70014-description

Music wire
Shop By
Shopping Options
d - Wire diameter (mm)
De - External diameter (mm)
L0 - Unloaded length (mm)
Ln - Max. loaded length (mm)
Sn - Maximum travel (mm)
Fn - Maximum load at Ln (N)
F0 - Initial force (N)
R - Spring constant (N/mm)
Range
Material

Items 1-10 of 1324

Set Descending Direction
View prices - Add to Cart Material d
Wire diameter (mm)		 De
External diameter (mm)		 L0
Unloaded length (mm)		 Ln
Max. loaded length (mm)		 Sn
Maximum travel (mm)		 Fn
Maximum load at Ln (N)		 F0
Initial force (N)		 R
Spring constant (N/mm)		 Range SKU Stock Tech Drawing Read More 3D CAD
Music wire 0.18 1.60 6.35 13.72 7.37 1.42 0.13 0.18 B E00630070250M E00630070250M
Music wire 0.18 1.60 7.87 18.54 10.67 1.42 0.13 0.12 B E00630070310M E00630070310M
Music wire 0.18 1.60 9.65 23.62 13.97 1.42 0.13 0.09 B E00630070380M E00630070380M
Music wire 0.18 1.60 11.18 28.45 17.27 1.42 0.13 0.07 B E00630070440M E00630070440M
Music wire 0.18 1.60 12.70 33.27 20.57 1.42 0.13 0.07 B E00630070500M E00630070500M
Music wire 0.20 1.60 6.35 11.68 5.33 2.00 0.18 0.35 B E00630080250M E00630080250M
Music wire 0.20 1.60 7.87 15.24 7.37 2.00 0.18 0.25 B E00630080310M E00630080310M
Music wire 0.20 1.60 9.65 19.05 9.40 2.00 0.18 0.19 B E00630080380M E00630080380M
Music wire 0.20 1.60 11.18 23.11 11.93 2.00 0.18 0.16 B E00630080440M E00630080440M
Music wire 0.20 1.60 12.70 26.67 13.97 2.00 0.18 0.12 B E00630080500M E00630080500M
  1. E00630070250M
    In stock: 358
    E00630070250M
    Material Music wire
    d - Wire diameter (mm) 0.18
    De - External diameter (mm) 1.60
    L0 - Unloaded length (mm) 6.35
    Ln - Max. loaded length (mm) 13.72
    Sn - Maximum travel (mm) 7.37
    Fn - Maximum load at Ln (N) 1.42
    F0 - Initial force (N) 0.13
    R - Spring constant (N/mm) 0.18
    Range B
  2. E00630070310M
    In stock: 537
    E00630070310M
    Material Music wire
    d - Wire diameter (mm) 0.18
    De - External diameter (mm) 1.60
    L0 - Unloaded length (mm) 7.87
    Ln - Max. loaded length (mm) 18.54
    Sn - Maximum travel (mm) 10.67
    Fn - Maximum load at Ln (N) 1.42
    F0 - Initial force (N) 0.13
    R - Spring constant (N/mm) 0.12
    Range B
  3. E00630070380M
    In stock: 281
    E00630070380M
    Material Music wire
    d - Wire diameter (mm) 0.18
    De - External diameter (mm) 1.60
    L0 - Unloaded length (mm) 9.65
    Ln - Max. loaded length (mm) 23.62
    Sn - Maximum travel (mm) 13.97
    Fn - Maximum load at Ln (N) 1.42
    F0 - Initial force (N) 0.13
    R - Spring constant (N/mm) 0.09
    Range B
  4. E00630070440M
    In stock: 83
    E00630070440M
    Material Music wire
    d - Wire diameter (mm) 0.18
    De - External diameter (mm) 1.60
    L0 - Unloaded length (mm) 11.18
    Ln - Max. loaded length (mm) 28.45
    Sn - Maximum travel (mm) 17.27
    Fn - Maximum load at Ln (N) 1.42
    F0 - Initial force (N) 0.13
    R - Spring constant (N/mm) 0.07
    Range B
  5. E00630070500M
    In stock: 4,121
    E00630070500M
    Material Music wire
    d - Wire diameter (mm) 0.18
    De - External diameter (mm) 1.60
    L0 - Unloaded length (mm) 12.70
    Ln - Max. loaded length (mm) 33.27
    Sn - Maximum travel (mm) 20.57
    Fn - Maximum load at Ln (N) 1.42
    F0 - Initial force (N) 0.13
    R - Spring constant (N/mm) 0.07
    Range B
  6. E00630080250M
    In stock: 134
    E00630080250M
    Material Music wire
    d - Wire diameter (mm) 0.20
    De - External diameter (mm) 1.60
    L0 - Unloaded length (mm) 6.35
    Ln - Max. loaded length (mm) 11.68
    Sn - Maximum travel (mm) 5.33
    Fn - Maximum load at Ln (N) 2.00
    F0 - Initial force (N) 0.18
    R - Spring constant (N/mm) 0.35
    Range B
  7. E00630080310M
    In stock: 204
    E00630080310M
    Material Music wire
    d - Wire diameter (mm) 0.20
    De - External diameter (mm) 1.60
    L0 - Unloaded length (mm) 7.87
    Ln - Max. loaded length (mm) 15.24
    Sn - Maximum travel (mm) 7.37
    Fn - Maximum load at Ln (N) 2.00
    F0 - Initial force (N) 0.18
    R - Spring constant (N/mm) 0.25
    Range B
  8. E00630080380M
    In stock: 248
    E00630080380M
    Material Music wire
    d - Wire diameter (mm) 0.20
    De - External diameter (mm) 1.60
    L0 - Unloaded length (mm) 9.65
    Ln - Max. loaded length (mm) 19.05
    Sn - Maximum travel (mm) 9.40
    Fn - Maximum load at Ln (N) 2.00
    F0 - Initial force (N) 0.18
    R - Spring constant (N/mm) 0.19
    Range B
  9. E00630080440M
    In stock: 217
    E00630080440M
    Material Music wire
    d - Wire diameter (mm) 0.20
    De - External diameter (mm) 1.60
    L0 - Unloaded length (mm) 11.18
    Ln - Max. loaded length (mm) 23.11
    Sn - Maximum travel (mm) 11.93
    Fn - Maximum load at Ln (N) 2.00
    F0 - Initial force (N) 0.18
    R - Spring constant (N/mm) 0.16
    Range B
  10. E00630080500M
    In stock: 40
    E00630080500M
    Material Music wire
    d - Wire diameter (mm) 0.20
    De - External diameter (mm) 1.60
    L0 - Unloaded length (mm) 12.70
    Ln - Max. loaded length (mm) 26.67
    Sn - Maximum travel (mm) 13.97
    Fn - Maximum load at Ln (N) 2.00
    F0 - Initial force (N) 0.18
    R - Spring constant (N/mm) 0.12
    Range B
Page
per page
Material
Music wire

The wire is certified in accordance with DIN 17223 Class C Wire WERKSTOFF NO. 1.1200 – EN Norm 10270-1
Working temperature between -30 ºC and +120 ºC
Recommended for use in dry environments.

Stainless steel

The wire is certified in accordance with DIN 17224 AISI 302 WERKSTOFF NO. 1.4310 – EN Norm 10270-3
Working temperature between -200 ºC and +250 ºC
Can be used in dry and humid or wet environments.

Galvanised

The wire is certified in accordance with DIN 17223 Class C Wire WERKSTOFF NO. 1.1200 – EN Norm 10270-1
Working temperature between -30 ºC and +120 ºC
Galvanised extension springs are made from piano wire, which is then electrogalvanised. Electrogalvanisation means that the extension spring is given a shiny, more corrosion-resistant surface.
Recommended for use in dry environments.

Tolerances

Series A and C: (See which series a spring belongs to in the “Series” column in the table).
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 will consequently not be stated for these series.

Series B: (See which series a spring belongs to in the “Series” column in the table).
See here for more information. (link to tolerances)

Series D: (See which series a spring belongs to in the “Series” column in the table).
The series is produced for use in testing and prototyping. There are therefore no tolerances for this series.

As this series is designed for testing, the cut spring’s coils will vary from spring to spring, and so the spring constant cannot be defined.

Datasheet and 3D CAD

If you want a PDF datasheet or a 3D CAD drawing of the spring in .step, .iges or .sat format, these can be downloaded for free by clicking on the 3D CAD symbol next to the item number in the table.

Terminology
Tech Drawing - Extension springs in piano wire, electrogalvanised wire and stainless steel wire
d
=
Wire diameter in mm
De
=
Udvendig diameter i mm (Di + (d*2))
LK
=
Ubelastet længde på fjederkrop
L0
=
Fri ubelastet længde, L0 er kun vejledende, L0 kan variere noget.
L1
=
Belastet længde i mm ved F1
L2
=
Belastet længde i mm ved F2
Ln
=
Max belastet længde i mm (min. længde / max belastning)
F0
=
Forspænding (N)
F1
=
Delvis belastning i N (Newton) ved L1
F2
=
Yderligere belastning i N (Newton) ved L2
sn
=
Max belastning i N (Newton) ved Ln (bør ikke anvendes)
R
=
Max vandring i mm. (L0 + Ln) (bør ikke anvendes)
R
=
Fjederkonstant i N/mm
LH
=
Indvendig øjehøjde i mm
m
=
Åbning (luft) ved øje i mm
x
=
Øjestilling
1 N
=
0,10197Kg
1Kg
=
9,80665N
Force calculation

The max. force in Newtons (Fn) for an extension spring in certified piano wire is approx. 10% higher than for the same dimensions in stainless spring steel.

Calculating initial tension (F0):
The initial tension (F0) of an extension spring is also called the initial force. This indicates how much force will be used to activate the extension spring.

Initial tension (F0) or initial force is for guidance only, as it can vary from batch to batch. As a rule of thumb, you can say that the initial tension (F0) corresponds to approx. 10-15% of maximum force (Fn).

Initial tension (F0) = Maximum force (Fn) - (Spring constant (R) x Maximum travel (Sn))

 

For example, the initial tension for stock number 32600 (Fn = 237 N, R = 2.67 N/mm and Sn = 75.70 mm) is calculated as:

237 N - (2,67 N/mm * 75,70 mm) = 35 N

The calculation of spring force at a given length:
If you want to know how much force an extension spring produces at a given length/travel, you can use the following formula:

Force at a given length (F1) = Initial tension (F0) + (Maximum travel (Sn) * Spring constant (R))

For example, stock number 32600, where R = 2.67 N/mm, where we want to know the force for a travel of 55 mm and F0 is approx. 35 N.

35 N + (55 mm * 2,67 N/mm) = 182 N

Design of loops

Series A: (See which series a spring belongs to in the “Series” column in the table).
German loops as per DIN 2097, random angle.

The loop position (X) is variable and the loops can therefore be turned in relation to one another. The external diameter of loops may well exceed the external diameter of the body.

German loop
German loop

Series A: Tolerance of loop width
The tolerance for deviations of loop width is determined based on the formula below. Note that you must use a value determined based on the spring’s coil ratio to be able to calculate the tolerance.

De (external diameter) + value from coil ratio table

Example: Stock number 32600 has a wire thickness (d) of 2.5 mm. The external diameter (De) is 18 mm, which produces a mean diameter (Dm) of 15.5 mm.

Based on the coil ratio table, we can therefore arrive at the value that needs to be added to the spring’s external diameter (De) to find the max. external diameter of the loop.

Coil ratio: 15,5 mm / 2,5 mm = 6,2 mm
Loop max. width: 18 mm + (1,5 * 2,5 mm) = 21,75 mm

Coil ratio table
Coil ratio: (dm/d)
Gütegrad 2
0 mm - 6 mm
d
6 mm - 12 mm
1,5 * d
12 mm +
The design of loops can be arranged on agreement.

Serie A: - Tolerance of internal loop height
Tolerance of internal loop height (LH) is from 0,8 mm to 1,1 * Dm.

(E.g. Stock number 32600 has a mean diameter (Dm) of 15.5 mm.
Min. internal loop height = 0.8 * 15.5 mm = 12.4 mm.
Max. internal loop height = 1.1 * 15.5 mm = 17.05 mm.

Loop height (LH)
Loop height (LH)

Series B and C: (See which series a spring belongs to in the “Series” column in the table).
Loops in this range are German loops without a specific loop shape and with a random angle. Exceptions are stock numbers 503 and 503RF, which have English loops.

Det tilstræbes at holde samme udvendige diameter på øjet som på fjederkroppen. Øjets udvendige diameter kan dog variere. Der er ingen tolerance på disse serier.

English loop
English loop

Series D: (See which series a spring belongs to in the “Series” column in the table).
There are no loops for this series. It is intended for testing and cutting. The customer must, therefore, create their own loops. To extend the service life of the spring, we recommend making loops in soft bends without notches. If the loop is bent too sharply, this may result in a weak point in the spring.

Series D have no loops
Series D have no loops

Service life of springs

The service life of a spring is generally very difficult to define. A large number of parameters come into play, and it is therefore impossible to define a service life.

Parameters with a significant influence on service life include: Installation, installation method, number of movements, vibrations, shocks, torsion, length of travel, non-axial travel, temperature, wear against other surfaces, environment of use, any cleaning agents, lateral impacts, etc.

Always dimension an extension spring so that it delivers the desired travel and force with as little exertion as possible. This will give the spring the longest possible service life.

Applying the maximum load to the spring or exceeding it will shorten its service life and may cause it to become permanently distorted.

Therefore we recommend that you do not use more than 75% of the maximum travel (Sn) of conical springs.

Winding direction

Usually right. The force and application is not affected by the direction of wind.

Standard extension springs are not defined with a specific direction of wind. Depending on production, the springs may be either right or left wound.

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)

Safety requirements for extension springs in structures where a person is suspended from the spring, e.g. baby hammocks and baby bouncers

When using springs for baby hammocks or baby bouncers, for instance, or other structures where a person is suspended from a structure in some way, you must be aware of the following:

Spring deformities or breakages
A spring is a technical object that can be deformed, or that may break during use. There may be invisible defects in the alloy of a spring wire, and during the manufacture of the spring defects may also occur that can weaken the spring. Improper use of a spring can also reduce the service life of a spring and result in the spring becoming deformed or breaking.

A spring must always be dimensioned so that the spring always incorporates a safety factor that corresponds to the risk in use.

Safety device – IMPORTANT!
If a spring is to be used in a structure where a person is suspended in some way from the structure, and the spring will be a load-bearing element between the person and the structure, a separate appropriate safety device must be installed between the person and a fixed point. This ensures that the person cannot fall down if the spring becomes deformed or breaks.

It is always the user of a spring – in any structure where persons can fall or otherwise injure themselves – who is responsible for ensuring that the structure is correctly designed so that no personal injury can result if a spring becomes deformed or breaks.

Sodemann Industrifjedre A/S DOES NOT recommend the use of springs in structures where people are suspended from the spring.

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