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Die springs (tool springs) are cylindrical helical springs made from oval wire. The dimensions with regard to the installation space and the spring forces show constant values. Thread diameter, number of turns, thread pitch and block length are not specified, since these dimensions require a higher production-related balance.
These springs work just like a normal compression spring. The more it is compressed, the greater the force of the spring. A die spring does not have a round spring wire, but a rectangular variant is used. These rectangular spring wires generate higher forces.
Thanks to its design, this spring can deliver high force in a small space. They have to absorb a high load with a relatively high frequency. Die springs have to withstand strong impacts and are made for a long service life.
Die springs are subject to DIN standards and must be manufactured with the material: chrome vanadium 50CrV4 as standard.
The color coding is based on the code used in production. The springs are manufactured according to the European standard ISO 10243:2010.
There are different classes that can withstand different loads. Each of these classes has its own color coding. We produce die springs with the same lengths and diameters so that you can interchange the springs (different color codes). Spring diameters are matched to the specified groove and pin diameters. Diameter, capacity, length and also colors correspond to the ISO 10243 standard.
The ISO 10243 standard defines parameters for compression springs with a rectangular cross-section as follows:
D outside diameter, equal to the diameter of the housing;
d inner diameter, equal to the diameter of the guide pin;
Lo Free Length, the length of the spring at rest;
R-value (N/mm). This is the load in Newtons (N) required to deflect the spring 1 mm (1 mm 0.04 in; 1 N 0.102 kgf 0.225 lbf).
Die springs are characterized by their high strength and short spring deflection. Almost all die spring sizes are divided into 4 color categories, these categories are formed based on the force and stroke of the die springs. Please note the colors given in the table. If a spring with more or less force is desired, it can be used with the same dimensions – but with a different color code – as the spring has the same installation dimensions.
Alcomex offers you 4 spring colors in the catalogue, according to the ISO 10243 standard:
BV violet, very low load;
BG Green, low load;
BA Blue, Medium Duty;
BR Red, medium duty;
BY Yellow, heavy burden.
BB Brown, very heavy burden.
Two strands of springs with ISO standard diameters and lengths but with some distinguishing features:
Black, extra light load, with working deflections up to 50% of free length;
BO Orange, super heavy load, for extra large loads.
| Norm | Series | Force | Total load long life | Cycles | Maximum working totale load | Cycles | Block deflection |
| ISO 10243 | Green | Light load | 30% | +3.000.000 | 40% | 200.000 | Approx. 50% |
| ISO 10243 | Blue | Medium load | 25% | +3.000.000 | 37,5% | 200.000 | Approx. 45% |
| ISO 10243 | Red | Medium load | 20% | +3.000.000 | 30% | 200.000 | Approx. 40% |
| ISO 10243 | Yellow | Heavy load | 17% | +5.000.000 | 25% | 200.000 | Approx. 35% |
| ISO 10243 | Brown | Very heavy Load | 10% | +5.000.000 | 15% | 200.000 | Approx. 30% |
Thanks to the steel used and the thermal treatment of the springs, all the springs in the catalog have a wide range of uses, these springs can be used at temperatures from -30°C to +250°C.
Die springs with static or dynamic loads are made from high-quality chrome-vanadium steel 50CrV4 according to ISO10243. This material guarantees a very long service life. By using high-quality chrome vanadium spring steel (50CrV4/DIN 17225/SAE 6150) and a special wire geometry (rectangular wire), maximum compressive strength and service life are achieved.
