ISO Die springs

Technical drawing - Die springs

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 die springs

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

Use the range sliders below to navigate around our large selection of ISO die springs quickly and easily.

What is an ISO die spring?

Die springs function like conventional compression springs. The more it is compressed, the more energy it releases. A die spring is produced from a rectangular spring wire, which provides greater force than ordinary round spring wire. The wire in ISO die springs is a little more rounded than in Raymond die springs. This is due to the way the wire is produced.

Characteristic of die springs is the significant force produced and a short spring travel. Virtually every size of die spring is divided into 4 colour categories, which are based on the force and travel of the die spring. See the colour groups under the table. If a spring with either more or less force is required, a spring with the same dimensions – but with a different colour code – can be used, as the spring has the same installation dimensions.

The series is manufactured in accordance with the ISO 10243 standard. This ensures the high quality. Die springs are available with a maximum force (Fn) from 100 N to 11,344 N (10.2 kg - 1,156.76 kg.)

ISO die springs can be used in a myriad of applications that require large forces in confined spaces. Die springs are mainly used in the tool industry. For use under extreme load, we recommend using the Raymond series (link to the Raymond series)

Please note that the colour code is not the same for ISO and Raymond die springs.

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Shopping Options
L0 - Unloaded length (mm)
Ln - Max. loaded length (mm)
Sn - Maximum travel (mm)
Fn - Maximum load at Ln (N)
R - Spring constant (N/mm)
Dd - Max shaft (mm)
Dh - Min. hole (mm)
S1 - Travel at F1 (mm)
L1 - Length at F1 (mm)
F1 - Force in N at S1 (N)
h - Thread height (mm)
b - Thread width (mm)

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Min. hole (mm)
Max shaft (mm)
Unloaded length (mm)
Spring constant (N/mm)
Travel at F1 (mm)
Length at F1 (mm)
Force in N at S1 (N)
Maximum travel (mm)
Max. loaded length (mm)
Maximum load at Ln (N)
SKU Stock Tech Drawing Read More 3D CAD
10,00 5,00 25,00 10,00 6,25 18,75 63,00 10,30 14,70 103,00 R203-104 R203-104
10,00 5,00 25,00 16,00 5,00 20,00 80,00 9,50 15,50 152,00 R204-104 R204-104
10,00 5,00 25,00 22,10 3,75 21,25 83,00 7,50 17,50 166,00 R205-104 R205-104
10,00 5,00 25,00 36,90 3,75 21,25 138,00 6,20 18,80 229,00 R206-104 R206-104
10,00 5,00 32,00 8,50 8,00 24,00 68,00 13,10 18,90 111,00 R203-105 R203-105
10,00 5,00 32,00 13,00 6,40 25,60 83,00 12,20 19,80 159,00 R204-105 R204-105
10,00 5,00 32,00 17,50 4,80 27,20 84,00 9,60 22,40 168,00 R205-105 R205-105
10,00 5,00 32,00 27,90 4,80 27,20 134,00 8,00 24,00 223,00 R206-105 R206-105
10,00 5,00 38,00 6,80 9,50 28,50 65,00 15,60 22,40 106,00 R203-106 R203-106
10,00 5,00 38,00 11,90 7,60 30,40 90,00 14,40 23,60 171,00 R204-106 R204-106

Items 1-10 of 403

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SAE-AISI 9254 (G92540) Silicon-Chromium Steel

Working temperature between -200 ºC and +200 ºC

ISO die springs are manufactured in accordance with ISO 10243


There are no tolerances for ISO die springs. They just need to stay within the minimum hole (Dh) and maximum shaft (Dd) dimensions.

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.

Color coding

The colour labelling is done by powder coating without a special protection from corrosion.

Minimun load - Longest travel
Medium load - medium travel
High load - short travel
Particularly high load - shortest travel
Winding direction

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

Standard die 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.

The maximum force (Fn) and/or maximum travel (Sn) should not be exceeded, as this reduces the service life significantly. To avoid uncontrolled dynamic stress, die springs should always be fitted with a specific initial tension.

The longest service life is achieved with load and travel of max. 25% of the free length (L0).


If die springs in cars or other applications are fitted or replaced with our die springs, Sodemann Industrifjedre A/S cannot be held responsible for any differences in performance or damage.

This also applies to customers who visit Sodemann Industrifjedre A/S and get help and/or guidance.

It is not possible to get custom-made die springs.

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