Typically contains the rivet part number or manufacturer code.
Indicates the length of the rivet or special installation notes (e.g., dimple, spot weld). Why You Need a NAS523 Rivet Code PDF nas523 rivet code pdf
The sheet metal is too thin to countersink, requiring a die to press a dimple into the skin. Typically contains the rivet part number or manufacturer
is a National Aerospace Standard (NAS) document published by the AIA/NAS (Aerospace Industries Association) that defines the identification markings for solid rivets. nas523 rivet code pdf