DIN EN 4131 : 2010 Title: Aerospace series - Bolts, normal hexagonal head, coarse tolerance normal shank, medium length thread, in heat resisting nickel base alloy, aluminium IVD coated - Classification: 1250 MPa (at ambient temperature)/425 °C; German and English version EN 4131:2009 + AC:2010 Year: 2010 Publisher: DIN Media GmbH Availability: Within 1-2 working days