DS EN 2939:1995 Aerospace Series - Screws, 100 Degree Countersunk Head, Offset Cruciform Recess, Threaded To Head, In Heat Resisting Steel Fe-Pa92ht (A286) - Classification: 900 Mpa (At Ambient Temperature)/650 Degree C Defines the characteristics of screws with 100 degree countersunk head with offset cruciform recess, threaded to head, in FE-PA92HT, for aerospace applications.