T.O. 1-1A-9 TABLE 3-17.  GENERAL RIVET (ALLUM) IDENTIFICATION CHART (CONT'D) HEAD AND SUPERS EDING NUMERICAL HEAT OLD AN STD MS STD FORM MATERIAL IDENT CODE CONDITION TREAT MS20604 Universal Head 5056 B F No Blind Class I 2117 AD T-4 No Non Struct Monel M or No MP (MP = Monel Plated MS20605 100 Flash 5056 B F No Head Blind 2117 AD T-4 No Class 2, non Monel M or No struct MP (MP= Monel Plated MS20606 Modified 5056 B F No Trusshead 2117 AD T-3 No Blind Class 3 Monel M or No Non Struct MP (MP= Monel Plated MS20613 Universal Head 1010 Recessed No Solid Triangle annealed 302 C-None Annealed No MS20615 Universal Head Copper CW No Solid Annealed Monel Raised Class Dots A No Note:    Copper,  steel,  and  Monel  listed  for  information  purposes.    For  special  rivets  see  manufacturing  drawing,  data, specification, etc.  For other information on rivets see T.O. 1-1A-8/1-1A-1. 3-39