We are the sole European distributor for Tohatsu Die Springs
- Hole Diameter
- This identifies the outside diameter (OD) of the die spring. Die springs are available in eight different hole sizes matched to standard drill sizes. Each spring is made to fit in the hole, so the OD of the spring is actually less than the hole diameter.
- Rod Diameter
- This is a nominal identification of the inside diameter (ID) of the die spring. Die springs are available in eight different hole sizes matched to standard stripper bolts. Each spring is made to fit over the rod, so the ID of the springs is actually greater than the rod diameter.
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- Load (Operating Force)
- This is the force built up by compressing the spring. Load is expressed in terms of total Newtons, which is the load on the spring per a specific unit of deflection. Load is generated and stress on the coils increases.
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- Operating Travel
- The distance which is subtracted from the spring length after operating force has been applied.
- Stress
- In a spring, this describes the internal force that resists deflection under load. This force is equal to, and in the opposite direction of, the external load. Stress is expressed in Newtons per square millimetre of sectional area.
- Free Length
- The length of a die spring before it is subject to any operating force or load.
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- Deflection
- The amount of change in spring length after operating force has been applied. The compressed length is computed by subtracting the initial compression and the operating travel from the free length.
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- Preload
- The distance the free length of the die spring is reduced by the pressure of the assembled tool.
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- Solid Height
- The length of a spring when it is compressed by enough load to bring all the coils into contact with each other.
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- Remove Set
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The manufacturing process of closing a compression spring to solid to eliminate load loss in operation.
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- Permanent Set
- This happens when the elastic limit is exceeded and the spring does not return to its original length when the load is released.
- Elastic Limit
- The maximum compression stress that a die spring can endure without taking permanent set.
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Nitrogen Gas Springs