Expansion and
narrow shaft

Constant tension force with expansion screws

Expansion screws are a particularly flexible form of special screws. They reach their highest possible tension force by application of super-elastic installation torque. Length variations in the application, for example due to temperature changes, therefore have no impact on the strength of the bolted joint. The screws therefore have elastic characteristics.

Because of their flexibility, expansion screws are especially suited for high temperature applications, such as engine production. 

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