Provides instructions for preparing the material, such as dimpling or countersinking. : Dimple both sheets. : Dimple two top sheets and countersink the third. Southeast (SE): Fastener Length
This section designates the length of the rivet, commonly listed in sixteenths of an inch (1/16"). A designation of '-5' would correspond to a length of 5/16". 4. Southeast (SE) - Head Type and Additional Notes
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. nas523 pdf
: Identifies that the fastener selection follows the National Aerospace Standard coding rules. 2. The Rivet Code (Material and Head Style)
One such critical standard is , which covers identification codes for solid rivets. Understanding this standard is essential for Aircraft Maintenance Engineers (AMEs), structural engineers, and procurement specialists. Provides instructions for preparing the material, such as
Indicates the rivet diameter (usually in 32nds of an inch) and the material/alloy code (e.g., "AD" for 2117 aluminum) .
If you need an insulating washer to prevent galvanic corrosion between a steel bolt and an aluminum airframe, you need NAS523 . If you need a load-spreading metallic washer, you need NAS412 or AN960 . Southeast (SE): Fastener Length This section designates the
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.