MIL-HDBK-57Revision CListing of Fastener Manufacturer's Identification SymbolsLoading PDF document...This may take a momentDocument Revisions (10)Revision Revision C (selected)Revision Revision BRevision Revision HRevision Revision ERevision Revision GRevision Revision FRevision Revision B Notice 1 - ValidationRevision Revision JRevision Revision DRevision Revision B Notice 2 - Validation💬