DIN EN 4421 : 2008 Title: Aerospace series - Studs, in titanium alloy TI-P64001, MoS<(Index)2> coated, with serrated locking ring in corrosion resisting steel - Strength Class: 1100 MPa (at ambient temperature); German and English version EN 4421:2007 Year: 2008 Publisher: DIN Media GmbH Availability: Within 1-2 working days