DIN EN 4321 : 2006 Title: Aerospace series - Bolts, double hexagon head with lockwire holes, relieved shank, long thread, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated - Classification: 1550 MPa (at ambient temperature)/650 °C; German and English version EN 4321:2004 Year: 2006 Publisher: DIN Media GmbH Availability: Within 1-2 working days