DIN EN 3444 : 2007 Title: Aerospace series - Bolts, large bihexagonal head, close tolerance normal shank, medium length thread, in heat resisting nickel base alloy, passivated - Classification: 1250 MPa (at ambient temperature)/650 °C; German and English version EN 3444:2006 Year: 2007 Publisher: DIN Media GmbH Availability: Within 1-2 working days