DS EN 3294:2008 Aerospace Series - Bolts, T-Head, Close Tolerance, In Heat Resisting Nickel Base Alloy Ni-P101ht (Waspaloy), Uncoated For Increased Height Nuts - Classification: 1210 Mpa/730 Degree C Defines the dimensions of uncoated T-head bolts, close tolerance, with MJ-thread, thread length for increased height nuts, in heat resistant nickel base alloy NI-P101HT for aerospace applications.