Only if the rotor head is designed for low clamp loads. Rotors typically require metal washers (NAS1149 or NAS412) due to extreme centrifugal forces. Check your rotor maintenance manual first.
: Indicates a high-strength 2024 aluminum alloy rivet often used in high-stress skin-to-stringer joints. 2. Northeast (NE) Quadrant: Diameter and Head Location
The length of the rivet should be chosen so that the shop head (the formed head) is properly sized. A rule of thumb is that the rivet should protrude 1.5 times its diameter through the structure. nas523 pdf
The strength of the NAS523 system lies in its ability to pack significant technical data into a short alphanumeric string. A typical code is broken down into specific components that describe the fastener's physical and functional properties. The Symbol
NAS523 is a standard published by the Aerospace Industries Association (AIA) that defines a system of coded symbols for specifying fasteners on engineering drawings. Its official title is "FASTENER CODE". Only if the rotor head is designed for low clamp loads
This system is invaluable for technicians and engineers because it allows a large amount of information—type, material, size, and installation method—to be packed into a small, four-quadrant "crosshair" symbol. Breaking Down the NAS523 Symbol (The 4-Quadrant System)
NAS stands for . These standards are published by the Aerospace Industries Association (AIA) to ensure uniformity and safety across the aerospace supply chain. : Indicates a high-strength 2024 aluminum alloy rivet
The NAS523 PDF does not exist in isolation. It references many other crucial NAS documents. If you are building a complete engineering library, you will also need standards like , among others, as they are all cited within the NAS523 standard.
Northwest (NW) | Northeast (NE) Fastener Identification| Fastener Diameter Code =======================+======================= Southwest (SW) | Southeast (SE) Hole Preparation | Fastener Length Code Use code with caution. 1. Northwest (NW) Quadrant: Fastener Identification
An aircraft designed in 2024 will reference . An aircraft designed in 1980 likely references NAS523-1981 or -1993 . Do not mix and match revisions unless the engineering change order specifically allows it.