DS EN 3063:1995 Aerospace Series - Bolts, Double Hexagon Head, Close Tolerance Shank, Medium Length Thread, In Heat Resisting Nickel Base Alloy Ni-P101ht (Waspaloy) - Classification: 1210 Mpa (At Ambient Temperature)/730 Degree C Defines the characteristics of double hexagon headed bolts with close tolerance shank and medium length thread, in NI-P101HT, for aerospace applications.