MIL-HDBK-131A, MILITARY STANDARDIZATION HANDBOOK: IDENTIFICATION MARKINGS FOR FASTENERS (HANDBOOK H-131) (15-SEP-1966)

MIL-HDBK-131A, MILITARY STANDARDIZATION HANDBOOK: IDENTIFICATION MARKINGS FOR FASTENERS (HANDBOOK H-131) (15-SEP-1966)., This handbook illustrates identification markings for fasteners. Because of the wide use of various identification markings, this military handbook is published to minimize the possibility of introducing duplicate markings.