DS EN 4306:2005 Aerospace Series - Sleeves, Tubular, For Tension Screws With Flush Head, In Corrosion Resisting Steel, Passivated, (0,50 Mm Wall Thickness) Defines the characteristics and technical requirements of tubular sleeves for tension screws with flush head, which may be plain or provided with a series of annular grooves, in corrosion resisting st