Compression springs in piano wire, electrogalvanised wire and stainless steel wire

Tech Drawing - Compression springs in piano wire, electrogalvanised wire and stainless steel wire

Order Monday-Thursday before 15:30 and Friday before 14:45 and we’ll dispatch your order the same day with expected delivery within 2-4 days. This applies to all stocked compression springs

See quantity discounts and prices by clicking on the shopping cart next to the required product.

To find the spring you want quickly and easily, use the range sliders.

Even though we have Denmark’s largest selection of standard compression springs with over 500,000 stocked compression springs in more than 5,000 different sizes, we have made it easy to find the right compression spring and exactly the quantity you need.

We have everything from small compression springs used in precision engineering to large compression springs for industrial applications. The selection of standard compression springs covers lengths from 2.00 mm to 1080.00 mm. The selection is produced in accordance with current DIN standards with the highest quality demands in Europe and America.

What is a compression spring?
 

Compression springs are used in a wide range of products where compressive force is needed. This can include everything from hearing aids, ballpoint pens and lawnmowers, through to industrial machinery and much more.

Compression springs are basically a component that can accumulate force and work at optimal levels for a prolonged period, provided that they are used and dimensioned correctly. The force accumulates in the spring as it is being compressed, and is released when the spring is allowed to return to its original length.

Piano wire: dry environment
 

Piano wire springs are recommended for use in dry environments. The material offers no protection against rust. Piano wire springs are approximately 10% stronger than stainless steel springs.

Electrogalvanised compression springs are made from piano wire, which is then electrogalvansed. This gives the compression springs an attractive, shiny surface. Electrogalvanisation only provides moderate corrosion resistance, but if the spring is used in a humid environment, the service life will be prolonged compared to the same spring made from piano wire without surface treatment.

Stainless steel wire: humid environment
 

For humid environments we recommend springs made from stainless steel wire. Stainless steel springs are approximately 10% weaker than piano wire springs.

If you use springs in environments where they are exposed to harsh chemicals or salt water, we recommend springs in a specific type of stainless steel (AISI 316). We do not keep these in stock, but we can custom-produce them on request. Contact us for further information.

Springs for cutting and testing
 

If you are unsure about the length/travel you need, we have springs in lengths of 300, 500 and 1,000 mm manufactured specifically to be cut to length and used for prototypes and testing. Sort by lengths using the slider below.

6-46655-description

Stainless steel 302

6-46095-description

Music wire

6-46719-description

Galvanised

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Shopping Options
d - Wire diameter (mm)
De - External diameter (mm)
Di - Internal diameter (mm)
L0 - Unloaded length (mm)
Ln - Max. loaded length (mm)
Sn - Maximum travel (mm)
Fn - Maximum load at Ln (N)
R - Spring constant (N/mm)
Range
Material

Items 1-10 of 5404

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View prices - Add to Cart Material d
Wire diameter (mm)
De
External diameter (mm)
Di
Internal diameter (mm)
L0
Unloaded length (mm)
Ln
Max. loaded length (mm)
Sn
Maximum travel (mm)
Fn
Maximum load at Ln (N)
R
Spring constant (N/mm)
SKU Stock Tech Drawing Read More 3D CAD
Stainless steel 302 0.15 1.45 1.15 3.05 1.55 1.50 0.85 0.55 C00570060120S C00570060120S
Music wire 0.15 1.45 1.15 3.05 1.55 1.50 1.02 0.67 C00570060120M C00570060120M
Stainless steel 302 0.15 1.45 1.15 4.83 2.29 2.54 0.85 0.32 C00570060190S C00570060190S
Music wire 0.15 1.45 1.15 4.83 2.29 2.54 1.02 0.39 C00570060190M C00570060190M
Stainless steel 302 0.15 1.45 1.15 6.35 2.90 3.45 0.85 0.23 C00570060250S C00570060250S
Music wire 0.15 1.45 1.15 6.35 2.90 3.45 1.02 0.28 C00570060250M C00570060250M
Stainless steel 302 0.15 1.45 1.15 7.87 3.51 4.36 0.85 0.19 C00570060310S C00570060310S
Music wire 0.15 1.45 1.15 7.87 3.51 4.36 1.02 0.23 C00570060310M C00570060310M
Stainless steel 302 0.15 1.45 1.15 9.65 4.24 5.41 0.85 0.16 C00570060380S C00570060380S
Music wire 0.15 1.45 1.15 9.65 4.24 5.41 1.02 0.19 C00570060380M C00570060380M

Items 1-10 of 5404

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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.
If a compression spring in AISI 316 is required, we can make them to order.

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 compression springs are made from piano wire, which is then electrogalvanised. Electrogalvanisation means that the compression 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).
DIN 2098 defines the spring’s dimensions based on wire thickness.

DIN 2095 defines the force as the determining parameter. The number of coils will therefore vary. L0 is for guidance only and may well be longer than stated in the tables. Once loaded the spring will set itself and thus achieve the correct length. Deviations are usually observed with a large coil ratio ((De - d) / d), where the spring has a thin wire in relation to the diameter.

Mean diameter Tolerances

Dm (mm)
From
To
0,63
1,00
1,00
1,60
1,60
2,50
2,50
4,00
4,00
6,30
6,30
10,00
10,00
16,00
16,00
25,00
25,00
31,50
31,50
40,00
40,00
50,00
50,00
63,00
63,00
80,00
80,00
100,00
100,00
125,00
125,00
160,00
160,00
200,00
Gütegrad 2 (mm)
Coil ratio (Dm / d)
4 ⇒ 8
8 ⇒ 14
14 ⇒ 20
+ - 0,07
+ - 0,10
+ - 0,15
+ - 0,08
+ - 0,10
+ - 0,15
+ - 0,10
+ - 0,15
+ - 0,20
+ - 0,15
+ - 0,20
+ - 0,25
+ - 0,20
+ - 0,25
+ - 0,30
+ - 0,25
+ - 0,30
+ - 0,35
+ - 0,30
+ - 0,35
+ - 0,40
+ - 0,35
+ - 0,45
+ - 0,50
+ - 0,40
+ - 0,50
+ - 0,60
+ - 0,50
+ - 0,60
+ - 0,70
+ - 0,60
+ - 0,80
+ - 0,90
+ - 0,80
+ - 1,00
+ - 1,10
+ - 1,00
+ - 1,20
+ - 1,40
+ - 1,20
+ - 1,50
+ - 1,70
+ - 1,40
+ - 1,90
+ - 2,20
+ - 1,80
+ - 2,30
+ - 2,70
+ - 2,10
+ - 2,90
+ - 3,30

Series B: (See which series a spring belongs to in the “Series” column in the table).
In this series, the number of coils is not specified, as the spring is produced with a defined unloaded length and a specific force. In order to achieve the forces, the number of coils will be the variable.

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 - Compression springs in piano wire, electrogalvanised wire and stainless steel wire
d
=
Wire diameter in mm
De
=
External diameter (Di + (d*2))
Dm
=
Mean diameter in mm (De - d)
Di
=
Internal diameter in mm (De - (d*2))
n
=
Number of effective elastic coils
nt
=
Coils total (n+2)
L0
=
Free unloaded length. Lo is for guidance only. Lo can vary slightly.
L1
=
Loaded length in mm at F1
L2
=
Loaded length in mm at F2
Ln
=
Max. loaded length in mm (min. length/max. load)
F1
=
Partial load in N (Newtons) at L1
F2
=
Additional load in N (Newtons) at L2
Fn
=
Maximum load in N (Newtons) at Ln (should not be used)
sn
=
Maximum travel (compression) in mm (Lo-Ln) (should not be used)
R
=
Spring constant in N/mm
Dd
=
Arbor diameter over which the spring can work
Dh
=
Hole diameter in which the spring can work
1 N
=
0,10197 Kg
1 Kg
=
9,80665 N
Force calculation

If you want to know how much force a compression spring produces for a given length/travel, you can use the following formula:

Travel (s) x Spring constant (R)

If a spring is compressed 16 mm (s) and has a spring constant of 3 N/mm (R), this produces a force of: 16 mm x 3 N/mm = 48 N

16 mm x 3 N/mm = 48 N (ca. 4,8kg)

If a compression spring with a very high spring constant and carrying capacity is required, coloured die springs may be recommended. Read more

Spring constant

The spring constant tells you how much force a spring produces per millimetre when it is compressed. If a spring has a spring constant of 1.5 N/mm and it is compressed 10 mm, then the force of the spring is 15 N.

Series A, B and C:  The spring constant is given in the table.

Series D:  There are no spring constants for this range of springs. These springs are designed to test and try where the springs can be shortened to achieve the desired length. The spring constant depends on the length, so we are unable to provide a general spring constant.

Configuration of ends

Series A:   (See which series a spring belongs to in the “Series” column in the table).
Springs with a wire thickness of up to 0.8 mm are closed but unground.
Springs with a wire thickness of 1.0 mm and above are closed and ground.

Series B and C:  (See which series a spring belongs to in the “Series” column in the table).
The product page for each individual product shows if it is closed and ground or unground.

Series D:  (See which series a spring belongs to in the “Series” column in the table).
As the series is produced for testing and cutting, the design of the ends is not defined.

Comp. spring, Closed, ground
Closed, ground
Comp. spring, Closed, unground
Closed, unground
Comp. spring, Not closed
Not closed
Winding direction

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

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

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 a compression 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.

Misc.

If the compression spring is compressed to Ln (the max. loaded length), it will set itself. It will then not return to its original length.

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