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Trumpf Power Fastener In a cold forming process, Trumpf Power Fasteners simultaneously cut and form the fastening element directly from the material being worked, the upper sheet being spot fastened to the lower sheet in a tight, form-locked connection. There is no damage to surface coatings or intermediate layers. These corrosion-resistant joints require no preparatory or refinishing operations, and incur no costs for fasteners. A clean and economical principle which provides long lasting, tight connections of attractive appearance.