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designates an MS20470AD universal-head rivet made from 2117 aluminum alloy. NE (Northeast - Upper Right): Specifies the rivet diameter in 1/32" increments and the location of the manufactured head Head on the "Near" side. Head on the "Far" side. SW (Southwest - Lower Left): Indicates the hole preparation method required for flush installations. Countersinking. Dimple top two sheets and countersink the third. SE (Southeast - Lower Right): Specifies the fastener length in 1/16" increments. A "-6" would indicate a 3/8" rivet. Common Aircraft Rivets (Reference) Material Code Alloy Markings on Head Material Type None (Plain) 1100 Aluminum Non-structural Single Dimple 2117 Aluminum Most common structural Raised Dot 2017 Aluminum "Icebox" rivet; must be frozen Raised Double Dashes 2024 Aluminum "Icebox" rivet; high strength Raised Cross 5056 Aluminum Magnesium structures Double Dimples Nickel-Copper High temp/Firewalls Practical Installation Guidelines Diameter Rule: Use a rivet diameter at least the thickness of the thickest sheet being joined. Length Calculation:
Each quadrant is given a compass designation: NW for northwest, NE for northeast, SW for southwest and SE. NAS523 Rivet Identification Guide | PDF - Scribd
: Represents an MS20426AD 100-degree countersunk-head rivet. nas523 pdf top
While MIL-STD-105 was canceled in 1995, NAS523 remains active and is enforced by major primes like Boeing, Airbus, Northrop Grumman, and Spirit AeroSystems.
This article serves as your comprehensive resource. We will explore the history of NAS523, break down its critical AQL (Acceptable Quality Level) tables, explain how to use the document to perform receiving inspection, and—crucially—guide you to the authoritative source for downloading the legitimate NAS523 PDF.
: The thickness of the rivet shank, usually measured in 32nds of an inch. : designates an MS20470AD universal-head rivet made from
The foundational element of the NAS523 standard is a stamped or printed on structural diagrams. The intersection point indicates the exact physical location of the fastener. Information regarding the fastener is split into four distinct quadrants named after standard compass designations.
The document applies to of fasteners (screws, bolts, rivets, nuts). It does not cover variable data (like tensile strength) but focuses on "go/no-go" criteria: thread defects, plating flaws, head cracks, and length deviations.
Not all PDF reference sheets are created equal. The best, top-downloaded NAS523 documents share specific characteristics that make them useful on the shop floor or at the engineering desk: 1. High-Resolution Visual Symbols SW (Southwest - Lower Left): Indicates the hole
The upper-right quadrant defines two critical geometric and procedural details: and head orientation .
Because it houses three drives, heat management is vital. The manual provides "top" tips on adjusting fan profiles to keep your drives healthy. How to Find the Best PDF Versions