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This European Standard specifies the characteristics of laminated washers, in corrosion resisting steel, for maximum operating temperature 120 °C, for aerospace applications. The standard EN 3903 has been prepared by the AeroSpace and Defence Industries Association of Europe - Standardization (ASD-STAN), with the participation of German experts at DIN Standards Committee Aerospace (NL). The responsible German standardization committee is Working Committee NA 131-03-01 AA "Verbindungselemente (Spiegelausschuss zu ISO/TC 20/SC 4" ("Aerospace fasteners (mirror committee to ISO/TC 20/SC 4)") at DIN Standards Committee Aerospace (NL).