The market requirements placed on fastener solutions are extremely complex, As a general rule such solutions can be classified into two main groups - detachable fasteners and permanent fasteners, Detachable fasteners are required where they may need to be undone, perhaps in the event of damage or because the application requires it. Here the market requirements are for low-cost parts and assembly materials, together with a high level of operating and process reliability. Permanent fasteners are used where components cannot be repaired and, for safety reasons, where they must never be removed (for example the airbag in a car), Here the market requires short assembly times, a high level of process reliability, and it goes without saying that the fasteners must never get lost.
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