Nas523 Rivet Code Pdf Jun 2026

The NAS523 specification is often confused with MS20470 (Universal head) and NAS1097 (reduced countersunk head), but NAS523 has a unique alloy composition and a distinct .

code is a symbolic system used on aviation blueprints and technical drawings to specify rivet installation details within a single four-quadrant "crosshair" symbol. NAS523 Quadrant Breakdown

: The manufactured head must face away from the technician, meaning the shop (formed) head will tail out on the near side. 3. Southwest (SW) Quadrant: Hole Preparation Standards

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This section specifies the nominal diameter of the rivet, usually measured in 32nds of an inch. It may also include a letter suffix indicating which side of the structure the manufactured head should be placed (e.g., "F" for Far Side, "N" for Near Side).

Specifies additional installation details or material types.

For professional use, follow this workflow: The NAS523 specification is often confused with MS20470

The is a standardized identification system established by the National Aerospace Standards Committee used to specify rivet types and installation requirements on aviation blueprints and assembly drawings. Unlike the standard MS (Military Standard) or AN (Army-Navy) part numbering, the NAS523 code uses a multi-quadrant "crosshair" symbol to consolidate various technical specifications into a single visual locating point. The NAS523 Crosshair Symbol

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: Aluminum Alloy (7050 grade, high-strength structural applications) This section specifies the nominal diameter of the

Disclaimer: Always refer to the latest manufacturer maintenance manual (AMM) or structural repair manual (SRM) for specific aircraft, as procedures can change. If you'd like, I can: Find a of the standard Explain how to read a specific four-quadrant symbol Detail the difference between AN and MS rivets Let me know how you'd like to narrow down the topic . NAS523 Rivet Identification Guide | PDF - Scribd

: Companies like Boeing or Piper may use proprietary variations (e.g., BAC codes) that cross-reference with NAS523 standards .

: If you work for an aerospace OEM (like Boeing, Airbus, or Lockheed Martin) or an MRO (Maintenance, Repair, and Overhaul) facility, the NAS523 PDF is typically accessible via your company’s internal Engineering Document Control portal.

A rivet code NAS523-6-8 has a grip of 0.500”. Using it in a stack-up of 0.400” to 0.490” is acceptable (within 0.010” over grip). But if the stack-up exceeds 0.500”, the shop head will be undersized, compromising shear strength by up to 40%.

The upper right quadrant contains: