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Disc springs
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How do I calculate disk springs?
For the calculation of plate springs, the coefficients must be calculated first.
After you calculate the deflection.
Then, the spring constant
The full explanation is in our blog.
We recommend always ask an expert to rely on the calculations. At Inexal we have a tool to calculate the stacking force and deflection of disc springs.
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How can disc springs be stacked?
Disc springs are placed in four different ways.
- A single disc spring
- Parallel stacking
- Stack series
- Parallel stacked in series
Read more about the stack of disc springs here.
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Which series of disc springs are there?
There are three groups of disc springs. Called:
- Group 1.
- Group 2.
- Group 3.
All three of the groups have three series. Called:
- Series A
- Series B
- Series C
Read more about the groups and series of disc springs here.
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What is the load/deflection curve of a single disc spring
The load/deflection curve of a single disc spring is not linear. The force formation depends on the ratio between height and thickness. If the ratio is small (0.4 series A), the feature is almost a straight line. The load deflection becomes more and more curved as the ratio h0/t increases.
Up to a ratio of 1.5, disc springs can be safely pressed into the flat position. At a ratio of 1.5, the curve is flat for a significant range of deflection. This is a useful consideration for wear compensation.
Above 1.5 the disc spring shows more and more regressive characteristics and is able to push through and therefore needs to be fully supported. At ratios greater than 2, the disc springs may reverse when brought to the flat position.
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What are group 3 disc springs?
Group 3 disc springs have a material thickness of >6 mm. These disc springs are only available through customized disc springs at Inexal.
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What are group 1 disc springs?
Group 1 disc springs are defined when the steel thickness is <1.25 mm. Disc springs from group 1 can be found here.
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What are group 2 disc springs?
Group 2 disc springs have a material thickness of 1.25 to 6 mm. Disc springs from group 2 can be found via this link.
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What are disc springs according to series A?
Series A disc springs have a:
External Diameter / Thickness Steel = 18 (or less) & Free Length / Thickness Steel = 0.4
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What are Disc springs according to series B?
Disc springs according to series B have:
Series B:
De/t = 28 and a Ho/t = 0.75
The De is the external diameter of the disc spring.
The t is the thickness of the steel.
The Ho is the free length in the circle of the disc spring.
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What are Disc springs according to series C?
Series C has the following parameters:
De/t = 48 and Ho/t = 1.3
The De is the external diameter of the disc spring.
The t is the thickness of the steel.
The Ho is the free length in the circle of the disc spring.
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What are the tolerances on the thickness of disc springs?
The tolerances on the disc spring thickness mainly depend on the group in which the disc spring is located:
| Group | Thickness in mm: | Tolerance in mm: |
| Group 1 | 0.2 t/m 0.6 | +0.02 / -0.06 |
| > 0.6 t/m < 1.25 | + 0.03 t/m -0.09 | |
| Group 2 | 1.25 t/m 3.8 | + 0.04 / - 0.12 |
| > 3.8 t/m 6.0 | + 0.05 / - 0.15 | |
| Group 3 | > 6.0 t/m 16.0 | +0.10 / - 0.10 |
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What are the tolerances on the forces of the disc springs?
The tolerances on disc spring force mainly depend on the group the cup spring is in:
| Group | Thickness in mm: | Tolerance force in %: |
| Group 1 | < 1.25 | +25% / -7.5% |
| Group 2 | 1.25 t/m 3.0 | + 15% t/m -7.5% |
| > 3.0 t/m 6.0 | + 10% / - 5% | |
| Group 3 | > 6.0 t/m 16.0 | +5% / - 5% |
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What are the tolerances on the height of disc springs?
The tolerances on disc spring height mainly depend on the group in which the disc spring is in:
| Group | Thickness in mm: | Tolerance height in mm: |
| Group 1 | < 1.25 | +0.1 / -0.05 |
| Group 2 | 1.25 t/m 3.0 | + 0.15 t/m -0.08 |
| > 3.0 t/m 6.0 | + 0.2 / - 0.1 | |
| Group 3 | > 6.0 t/m 16.0 | +0.3 / - 0.3 |
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