Threaded Fasteners 00.04 General Information 1 2 3 f310006a 10/19/93 1. Grade 8 Hexhead Bolt 2. Grade 8 Low-Profile Hexhead Bolt 3. Grade C Prevailing Torque Locknut Fig. 6, Frame Fastener Identification Business Class M2 Workshop Manual, Supplement 0, January 2002 050/4