DS EN 3613:2009 Aerospace Series - Bolts, Normal Hexagonal Head, Relieved Shank, Long Thread, In Heat Resisting Nickel Base Alloy Ni-Ph2601 (Inconel 718), Silver Plated - Classification: 1275 Mpa/650 Degree C Defines the characteristics of bolts normal hexagonal head with relieved shank and long thread in heat resisting nickel base alloy NI-PH2601 (Inconel 718), for aerospace applications.