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DIN 7500-1, case-hardened (-O-) galvanised steel, blue passivated (A2K) with anti-friction coating
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Self-tapping screws form a nut thread in cast blind holes, rim holes and drilled, lasered and punched sheet metal parts. Unlike thread cutting, self-tapping does not interrupt the material structure in the receiving thread. Instead, the material is displaced and strain-hardened.
Non-cutting thread formation
Low rolling torques with high thread flank overlap
High clamping force
High load-bearing capacity
Protection against loss (reduced likelihood of screw working loose)
The formed thread corresponds to a standard metric thread
The suitability of the GEFU for the application or component in question must be determined through preliminary testing. Guideline values for suitable hole diameters are specified in DIN 7500-2.
Examples of materials suitable for this type of non-cutting direct screw connection are ductile materials such as: steel (up to approx. 500 N/mm²), die-cast zinc, aluminium, copper and copper alloys etc.
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