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DIN 7500-1, flat head, case-hardened (-O-) galvanised steel, blue passivated (A2K)
A2 stainless steel with drill tip and shaped thread made of hardened steel and a cone slot H. For fasteners in aluminum and steel substructures in the non-approved area
Steel and galvanized blue passivated with sealing washer. Predominant mounting in wood as well as in steel substructure < 2 mm and aluminum substructure < 3 mm in the non-approved area
ISO 14585, A4 stainless steel, shape C (with tip)
ISO 15482 (replaces DIN 7504), drive PH, coating: Blue zinc-plated (A2K)