Nas523 Rivet Code Chart

: Represents a standard MS20470AD universal head rivet made from 2117 aluminum alloy. BB : Represents an MS20426AD 100° countersunk head rivet.

The is a symbolic system used on aircraft blueprints and assembly drawings to specify exactly which fasteners to use and how they should be installed. Instead of long text descriptions, engineers use a four-quadrant "crosshair" symbol that technicians must decode to identify rivet part numbers, materials, sizes, and installation methods. The Four Quadrants of the NAS523 Symbol Nas523 Rivet Code Chart

In the NAS523 specification, This code directly correlates to the minimum double-shear strength of the rivet in pounds. : Represents a standard MS20470AD universal head rivet

: Contains a code for the part number (e.g., AN or MS) and the alloy. Upper Right Diameter & Placement : Specifies rivet diameter in Instead of long text descriptions, engineers use a

Because NAS523 specifies aluminum alloys, the (anodize or dye) acts as a quick reference chart:

(or AN470AD) universal-head rivet made from 2117 aluminum alloy. : Often used to identify an "icebox" rivet made from 2024 aluminum alloy. Installation & Hole Preparation (SW Quadrant)

" increments and indicates if the manufactured head should be on the Near ( ) or Far ( Lower Left Hole Preparation : Details special methods like Dimpling ( ) or Countersinking ( ) for the sheets being joined. Lower Right Fastener Length : Indicates the length of the rivet in " increments (e.g., a Common NAS523 Material Codes