special springs
Special springs from wire and tape
If something is not in stock, Durovis manufactures it to measure, mostly in-house. Special springs according to customer specifications are part of our daily business and a welcome challenge.
A large stock of raw materials enables special springs to be produced within a very short time. With 3D spring configurators and calculation programs, Durovis supports designers in the development of new parts. Here is a summary of what we can do for you:
Compression springs: | 0.08 - 90.00mm |
Tension springs: | 0.15 - 30.00mm |
Torsion springs: | 0.15 - 30.00mm |
Wire form springs: | 0.15 - 30.00mm |
Leaf springs: | 0.10 - 10.00mm |
Spiral springs: | 0.10 - 14.00mm |
Standard springs from stock: | 0.10 - 12.00mm |
Technical informations
Tempering
After cold forming, all springs (except for meterware) are subjected to a heat treatment. This annealing process increases the toughness and reduces residual stresses.
End turns
The designation “n” in the catalog indicates the number of active turns. There are also two applied end turns. For compression springs with a wire thickness of less than 0.5 mm, the end turns are applied. For springs from 0.5 mm, the end turns are additionally ground to a circumference of approx. 270°.
Spring calculation
The catalog springs were calculated according to DIN 2095, EN 15800 for compression springs, DIN 2097 for tension springs and DIN 2194 for torsion springs, each according to quality level 2.
Manufacturing compensation
The production of springs requires production compensation in order to be able to maintain the specified values. With our standard compression springs, the compensation takes place over the length L0, so the springs can be slightly longer than L0 before they are pressed on the block for the first time.
Shot blasting
To increase fatigue strength, the springs can be hammered with steel or glass balls. Our standard springs are not shot peened. If desired, the springs can be shot blasted later for an additional charge.
Surface protection
The springs made of spring steel wire are lightly oiled. The springs made of stainless spring steel have no surface treatment. On request, we can supply you with the springs with any corrosion protection you require.
Eyelets
The standard tension springs have a complete German eyelet at both ends according to DIN 2097 Figure 3. The position is normally 0 degrees. The eyelets have no opening. However, we can cut an eyelet opening according to your wishes at short notice.
Set
When placed, the compression spring is compressed onto the block and loses length. This process reduces the relaxation of the spring during operation. The standard springs are not set and can therefore be slightly longer than L0.
Tolerances
The manufacturing tolerances for compression springs correspond to EN 15800 No. 4, quality level 2, or for tension springs DIN 2097 No. 4, quality level 2.
Preload
When winding tension springs, twisting the wire creates a force that presses the coils against each other. The force to lift the coils apart is called preload.
Designation | WST-Nr. | Designation | DIN / EN | E-Module, G-Module | Temperature | Usage note |
Spring steel wire | 1.0600 | Sorte B | EN 10270-1SM | 206'000, 81'500 | -60 to +80°C | all common springs, without high demands |
Spring steel wire (Norm) | 1.1200 | Sorte C | EN 10270-1SH | 207'500, 82'500 | -60 to +120°C | all common springs, for increased demands |
Spring steel wire | 1.1211 | Sorte D | EN 10270-1DH | 207'500, 82'500 | -60 to +120°C | as grade C, but for oscillating loads |
Valve spring wire | 1.1230 | FDC | EN 10270-2 | 206'000, 78'500 | -60 to +80°C | for springs to moderate vibrations |
Valve spring wire | 1.1250 | VDC | EN 10270-2 | 206'000, 79'500 | -60 to +80°C | For valve springs to vibration stress |
Valve spring wire | VD-CrV | VDCrV | EN 10270-2 | 206'000, 79'500 | -60 to +200°C | for high dynamic stress |
Valve spring wire | VD-SiCr | VDSiCr | EN 10270-2 | 206'000, 79'500 | -60 to +160°C | for highest dynamic stress |
Spring steel wire | 1.8159 | 51CrV4 | DIN 17221 | 206'000, 78'500 | 0 to +80°C | for hot forming, for high stresses |
Spring steel wire | 1.7103 | 67SiCr5 | DIN 17222 | 206'000, 78'500 | 0 to +80°C | for hot forming, for highest stresses |
Spring steel wire stainless (Norm) | 1.4310 | X10CrNi188 | EN 10270-3 | 195'000, 73'000 | -200 to +250°C | for food industry, corrosion resistant |
Spring steel wire stainless (V2A) | 1.4568 | X7CrNiAl177 | EN 10270-3 | 200'000, 78'000 | -200 to +350°C | for high stress, at elevated temperature |
Spring steel wire stainless (V4A) | 1.4571 | X6CrNiMoTi17 | EN 10270-3 | 180'000, 68'000 | -200 to +300°C | in the environment of aggressive media, acid resistant |
Brass wire | 2.0321 | CuZn37 | DIN 17682 | 112'000, 35'000 | -200 to +60°C | in alkaline water, seawater, non-magnetic |
Bronze wire | 2.1020 | CuSn6 | DIN 17682 | 103'500, 39'000 | -200 to +60°C | non-magnetic, solderable, corrosion resistant |
Beryllium bronze wire | 2.1247 | CuBe2 | DIN 17682 | 130'000, 49'000 | -200 to +150°C | antimagnetic, corrosion resistant, non-sparking |
Hastelloy C4 | 2.4610 | NiMo16Cr16Ti | DIN 17744 | 195'000, 76'400 | -100 to +400°C | in very corrosive environments, for heat-resistant springs |
Inconel X750 | 2.4669 | NiCr15Fe7TiAl | DIN 17744 | 214'000, 74'000 | -100 to +600°C | high temperature resistant, non-magnetic |
Nimonic 90 | 2.4969 | NiCr20Co18Ti | - | 241'000, 85'000 | -100 to +650° C | resistant to high temperatures, resistant to gases |
Description | Material-Nr. | Description | DIN / EN | E-Modul, G-Modul | Tempering °C / Duration | Tensile strength (soft) | Tensile strength (hard) |
Spring band steel | 1.0601 | C 60 | DIN 17222 | 206'000, 78'000 | 225-250 °C / 0.5-1h | -620 | 1180-1680 |
Spring band steel | 1.1221 | Ck 60 | DIN 17222 | 206'000, 78'000 | 225-250 °C / 0.5-1h | -620 | 1180-1680 |
Spring band steel | 1.0603 | C 67 | DIN 17222 | 206'000, 78'000 | 225-250 °C / 0.5-1h | -620 | 1230-1770 |
Spring band steel | 1.1231 | Ck 67 | DIN 17222 | 206'000, 78'000 | 225-250 °C / 0.5-1h | -640 | 1230-1770 |
Spring band steel | 1.0605 | C 75 | DIN 17222 | 206'000, 78'000 | 225-250 °C / 0.5-1h | -640 | 1320-1870 |
Spring band steel | 1.1248 | Ck 75 | DIN 17222 | 206'000, 78'000 | 225-250 °C / 0.5-1h | -640 | 1320-1870 |
Spring band steel | 1.1274 | Ck 101 | DIN 17222 | 206'000, 78'000 | 225-250 °C / 0.5-1h | -690 | 1500-2100 |
Spring band steel | 1.0904 | 55 Si 7 | DIN 17222 | 206'000, 78'000 | 225-250 °C / 0.5-1h | -740 | 1300-1800 |
Spring band steel | 1.7103 | 67 SiCr 5 | DIN 17222 | 206'000, 78'000 | 225-250 °C / 0.5-1h | -800 | 1500-2200 |
Spring band steel | 1.8159 | 50 CrV 4 | DIN 17222 | 206'000, 78'000 | 225-250 °C / 0.5-1h | -740 | 1400-2000 |
Spring band steel | 1.4310 | X12CrNi 17 7 | DIN 59381 | 195'000, 73'000 | 350-450 °C / 1h | -800 | 1100-2200 |
Spring band steel | 1.4401 | X5CrNiMo 1810 | DIN 59381 | 195'000, 71'000 | 350-450 °C / 1h | -740 | 1400-2000 |
Spring band steel | 1.4568 | X7CrNiAl 17 7 | DIN 59381 | 200'000, 78'000 | 450-550 °C / 1h | -800 | 1500-2200 |
Micro springs
The trend towards miniaturization continues. As a result, the interest in micro springs is growing. Automated assembly lines require not only high precision and cleanliness (medical technology) but also good spring detangling properties. To meet the increasing demand of our customers, we also offer micro springs, made of stainless wires and spring bronze, from wire thickness 0.08 mm. With our decades of experience in spring production, we can provide you with the best advice.