DS EN 3327:2008 Aerospace Series - Bolts, Double Hexagon Head, Close Tolerance, Medium Thread Length, In Heat Resisting Nickel Base Alloy Ni-P100ht (Inconel 718), Uncoated - Classification: 1275 Mpa/650 Degree C Defines the dimensions of uncoated double hexagon head bolts, close tolerance, with MJ-thread, medium thread length, in heat resisting nickel base alloy NI-P100HT for aerospace applications.