Details special methods or hole preparation required, such as dimpling (D) or countersinking (C). D2: Dimple both sheets. D2C: Dimple two top sheets and countersink the third. SE (Southeast - Lower Right): Specifies the rivet length in -inch increments. Example: A -6negative 6 code indicates a -inch length. Key Specifications & Reference
The NAS523 rivet code is a specification standard used in the aerospace industry for rivets. The code provides detailed requirements for the design, materials, and manufacturing of rivets used in aircraft and spacecraft. nas523 rivet code pdf