DIN EN 4498 : 2007 Title: Aerospace series - Bolts, large bihexagonal head, close tolerance normal shank, medium length thread, in heat resisting nickel base alloy, passivated, with aluminium pigmented coating, Classification: 1 550 MPa (at ambient temperature)/315 °C; German and English version EN 4498:2005 Year: 2007 Publisher: DIN Media GmbH Availability: Within 1-2 working days