The first few letters indicate the specification standard the rivet conforms to.
Special installation or hole preparation methods (e.g., dimpling). (Dimple both sheets) Southeast (SE) Lower Right Rivet length in 1/16" increments. -6 (3/8" long) Key Identification Codes nas523 rivet code pdf
NAS523 Solid Rivet Specifications : Focuses on body diameters, shop head dimensions, and repair guidelines. The first few letters indicate the specification standard
Boeing incorporates the NAS523 standard into its engineering documentation system. The company maintains a cross-reference table that maps NAS523 fastener codes to specific part numbers in its BACD2074 standard. For example, a fastener code shown on a Boeing engineering drawing corresponds to a specific fastener part number listed in the BACD2074 fastener chart. -6 (3/8" long) Key Identification Codes NAS523 Solid
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4. Southeast (SE) Quadrant: Fastener Length and Welding Alternates