| Load class | ISO 10243 | ISO D | Raymond® NAAMS |
|---|---|---|---|
| Extra light | Light green30 / 50 % | ||
| Light | Green25 / 35 % | Green25 / 40 % | |
| Medium | Blue20 / 30 % | Blue25 / 40 % | Blue25 / 40 % |
| Medium-heavy | Red20 / 30 % | ||
| Heavy | Red15 / 25 % | Red20 / 30 % | Bronze15 / 25 % |
| Extra heavy | Yellow15 / 20 % | Yellow17 / 25 % | Green15 / 20 % |
| Ultra heavy | Grey10 / 15 % |
The colour shows the load class within one series. Raymond® and ISO colours are not interchangeable. Percentages show the typical travel s1 (dynamic) / sn (static) as a share of the free length L0.
| Part No. | Series | Colour | Hole øDh · mm | Rod øDd · mm | LengthL0 · mm | Travels1 (dyn) · mm | ForceF1 (dyn) · N | Stock | Price Ex. VAT | |
|---|---|---|---|---|---|---|---|---|---|---|
| Loading die springs... | ||||||||||
How to choose a die spring
Set the hole diameter Dh, the rod diameter Dd and the free length L0 you have room for.
Add the preload to the working stroke. The total is the travel the spring has to take.
The force is roughly F = c × s, where c is the spring rate and s the total travel.
For springs that move regularly, use the dynamic values s1 and F1. The static values sn and Fn apply to constant loads or springs that are only used now and then.
Choose the series first, then compare installation dimensions, travel and force. Never choose by colour alone.
- ISO 10243
- ISO 10243 is the international standard for die springs in stamping and forming tools. Four load classes: green, blue, red and yellow.
- ISO D
- ISO D uses the same colour code as ISO 10243 and adds two classes: light green (extra light) and grey (ultra heavy).
- Raymond® NAAMS
- Raymond® NAAMS die springs have their own colour code: blue, red, bronze and green.
Service life depends mostly on travel, operating speed, guidance, installation and temperature. For reliable operation:
- Use several springs with a smaller deflection each, rather than a few springs close to their limit.
- Guide long springs on a rod, in a hole or both.
- Make sure the contact surfaces are flat and parallel.
- Never compress the spring to solid length.
- Do not mix series, lengths or load classes in the same tool.
- Replace all springs that share the same load at the same time.
Die springs are wound from rectangular wire in high-strength chromium alloy steel, made for dynamic use under high loads. At high temperatures the force and service life drop, so always stay within the travel limits and the operating temperature of the application.
- What is the difference between a die spring and a standard compression spring?
- Die springs are made for very high forces in small spaces. The rectangular wire carries a high load with comparatively short travel.
- Can I choose a die spring by its colour alone?
- No. The colour only shows the load class within a series, and Raymond® and ISO use different colour systems. Always compare installation dimensions, spring rate, travel and force.
- How many die springs do I need?
- Divide the total force you need by the force of one spring at the working stroke. Round up and spread the springs evenly in the tool.
- What is the difference between dynamic and static travel?
- Dynamic travel s1 is for springs that are compressed again and again. Static travel sn is for springs under constant load or used only occasionally. For frequent cycling, keep within s1.
- Why should all die springs in a tool be replaced together?
- Springs in the same tool go through the same load cycles. If you replace only one, the force is spread unevenly because the old springs may already have settled or fatigued.