MIL-STD-1291 Revision A, January 16, 1984
IDENTIFICATION SYMBOLS FOR AEROSPACE FASTENER MANUFACTURES
Includes all amendments and changes through Cancellation Notice 1, May 13, 1991
Additional Comments: CNCL S/S BY MIL-HDBK-57
Purpose. Identification Symbols or Markings which they use to identify their products, their Federal Supply Code for Manufacturers (FSCM) No. and last known address and telephone number. This document is a directory of Aerospace Fastener Manufacturers.
Application. This document is intended to be used as a reference, when it is necessary to identify a manufacturer from the symbol stamped on a fastener, such as during quality control checks, fastener failures, incident or accident investigations.