DS EN 3011:1998 Aerospace Series - Bolts, Hexagon Head, Relieved Shank, Long Thread, In Heat Resisting Nickel Base Alloy Ni-P101ht (Waspaloy), Silver Plated - Classification: 1210 Mpa (At Ambient Temperature/730 Degree C Defines the characteristics of hexagon headed bolts with relieved shank and long thread, in NI-P101HT, silver plated, for aerospace applications.