DIN EN 3431 : 2008 Title: Aerospace series - Nuts, hexagonal, self-locking, with counterbore and captive washer, in heat resisting steel, silver plated - Classification: 1000 MPa (at ambient temperature)/425 °C; German and English version EN 3431:2007 Year: 2008 Publisher: DIN Media GmbH Availability: Within 1-2 working days