: Tells the operator that the code follows the National Aerospace Standard coding system. The Letter Codes: Body & Head Styles
Indicates the rivet diameter (in 1/32" increments) and the manufactured head location . The letters N (Near) or F (Far) tell the technician which side of the sheet the head should be placed on.
The first result was a corrupted file. The second was a scanned document from 1972, the text wavy from the old photocopier. She opened it. Page one was a dry table of tolerances. Page two, a cross-section of a countersunk head. Page three… was different.
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If your is Rev 5, but the aircraft maintenance manual (AMM) references Rev 9, your installation may be non-compliant with 14 CFR Part 43 (maintenance rules). nas523 rivet code pdf
NAS523. She knew the prefix. National Aerospace Standard. A rivet spec. But the "code"? Rivets didn't have secret codes. They had diameters, head shapes, materials, and shear strengths. A "code" sounded like something from a spy novel, not a repair manual.
| Dash | Diameter (in) | Diameter (mm) | |------|---------------|----------------| | -3 | 3/32" | 2.38 mm | | -4 | 1/8" | 3.18 mm | | -5 | 5/32" | 3.97 mm | | -6 | 3/16" | 4.76 mm | | -8 | 1/4" | 6.35 mm |
Using the NAS523 rivet code PDF offers several benefits, including:
The NAS523 code system offers several advantages for aerospace design and manufacturing: : Tells the operator that the code follows
While memorizing the basic codes for standard aluminum rivets (like AD-4-6) is common for sheet metal technicians, aircraft utilize dozens of specialized fasteners. Titanium, Monel, and A-286 stainless steel rivets all have unique quadrant abbreviations that vary slightly by aircraft manufacturer (Boeing, Airbus, Lockheed, and Bombardier all use proprietary variations of standard NAS systems on older legacy prints).
The top section identifies the base specification and the material composition of the rivet. It typically contains a series of letters and numbers that map back to a standard design, such as an MS (Military Standard), NAS, or AN (Army-Navy) part number.
NAS523 Rivet Identification Guide | PDF | Rivet | Sheet Metal
This quadrant identifies the specific standard or part number of the rivet. It tells the technician the exact geometry and head style (e.g., universal head vs. 100-degree countersunk). The first result was a corrupted file
Quickly cross-reference code letters (like B, C, DD, M, Monel) with their galvanic corrosion properties.
The code consists of a central cross dividing four quadrants, each representing a specific attribute of the rivet installation: Designation Information Provided Fastener Type
Lena looked back at the Phantom. It wasn't a ghost. It was a sleeping soldier. And the wasn't a repair guide. It was a eulogy.
Imagine you see an NAS523 cross on an engineering drawing with the following values: MS20470 Top-Right: AD Bottom-Right: 4 Bottom-Left: 6
Specifies the rivet part number (e.g., AN or MS standards) and the material/alloy code . For example, the code "BJ" might identify a universal-head rivet made of 2117-T3 aluminum.
The NAS523 rivet code PDF explicitly states a shear strength of when heat-treated to the T6 condition. An aluminum NAS523 (if incorrectly substituted) would fail at 38,000 psi.