NAS523 is a rivet code that defines the requirements for a specific type of rivet used in aerospace applications. The code outlines the material, size, and performance characteristics of the rivet, ensuring that it meets the stringent standards of the aerospace industry. The NAS523 rivet code is widely used in the manufacture of aircraft, spacecraft, and other defense systems, where failure is not an option.
: Aluminum Alloy (5056 grade, high corrosion resistance, used with magnesium)
The symbol consists of a central cross whose intersection marks the exact location of the rivet on the drawing. Information is coded into four quadrants around this intersection: Information Provided Upper Left Rivet Identity (Part Number & Alloy) BJ (MS20470AD), BB (MS20426AD) NE Upper Right Diameter and Manufacturing Head Location 3N (3/32" diameter, head on Near side) SW Lower Left Hole Preparation (Dimple/Countersink) D (Dimple), C (Countersink), D2C SE Lower Right Rivet Length -5 (5/16"), -6 (3/8") Deep Dive into the Quadrants 1. Northwest (NW): Rivet Identity
This quadrant identifies the specific standard or part number of the rivet. It tells the technician the exact geometry and head style (e.g., universal head vs. 100-degree countersunk). nas523 rivet code pdf
While memorizing the basic codes for standard aluminum rivets (like AD-4-6) is common for sheet metal technicians, aircraft utilize dozens of specialized fasteners. Titanium, Monel, and A-286 stainless steel rivets all have unique quadrant abbreviations that vary slightly by aircraft manufacturer (Boeing, Airbus, Lockheed, and Bombardier all use proprietary variations of standard NAS systems on older legacy prints).
The NAS523 rivet code PDF is a comprehensive document that outlines the specifications for NAS523 rivets. The PDF document provides detailed information on:
NAS523 Rivet Code is a symbolic identification system used in aviation diagrams and engineering drawings to communicate fastener specifications clearly through a four-quadrant "crosshair" symbol. NAS523 Quadrant Breakdown NAS523 is a rivet code that defines the
solid rivets with blind rivets for specific applications. Explain other rivet codes (like AN or MS). NAS523 Rivet Identification Guide | PDF - Scribd
I can provide specific and fastener substitutions based on your current project requirements. Share public link
Understanding the NAS523 system reduces installation errors, ensures compliance with aviation regulatory authorities, and maintains structural conformity across manufacturing shifts. To help you get the exact chart you need, tell me: : Aluminum Alloy (5056 grade, high corrosion resistance,
The upper-left quadrant designates the core specification of the rivet, combining its head style and physical alloy into a compressed two-letter code.
The NAS523 rivet code PDF explicitly states a shear strength of when heat-treated to the T6 condition. An aluminum NAS523 (if incorrectly substituted) would fail at 38,000 psi.
The NAS523 standard references and is referenced by numerous other aerospace standards, including:
The NAS (National Aerospace Standard) prefix indicates a fastener designed for high-performance aircraft environments. Specifically, refers to a solid, protruding head rivet made of corrosion-resistant steel (typically A286 or similar superalloy). These rivets are used in airframe structures that require high shear strength and resistance to elevated temperatures (up to 800°F/427°C).