DS EN 3912:2007 Aerospace Series - Bolts, Pan Head, Six Lobe Recess, Relieved Shank, Long Thread, In Heat Resisting Steel Fe-Pa2601 (Fe-Pa92ht, A286), Silver Plated - Classification: 1100 Mpa (At Ambient Temperature)/650 Degree C Defines the characteristics of pan head bolts with six lobe recess, relieved shank and long thread, in FE-PA2601 (FE-PA92HT), silver plated, for aerospace applications.