To streamline the identification of rivet type, material, diameter, and length on a single, compact diagram rather than using long part numbers in notes. Understanding the NAS523 Fastener Code Symbol
This quadrant specifies the base part number of the rivet or fastener to be used, typically utilizing or Air Force-Navy (AN) alphanumeric codes. It may also incorporate a simplified code representing the specific alloy composition of the fastener body. For example, the designation "B1" is frequently mapped to a standard MS20470AD universal head rivet manufactured from 2117 aluminum alloy. 2. Northeast (NE) Quadrant: Fastener Diameter nas523 pdf
Aerospace Industries Association (AIA) / National Aerospace Standards (NAS) To streamline the identification of rivet type, material,
However, for the foreseeable future (2025 and beyond), the NAS523 PDF will remain the authoritative source. Regulators trust the static, uneditable nature of the PDF format for audits. For example, the designation "B1" is frequently mapped
Fastener diameter and manufacturer head location.