Nas523 Rivet Code Pdf

Deep Article: NAS523 Rivet Code (PDF)

The Complete Guide to the NAS523 Rivet Code PDF: Decoding Aerospace Fastener Standards

Is NAS523 Still Current?

As of 2025, many original equipment manufacturers (OEMs) like Boeing (BMS specifications) and Airbus (ABN specifications) have moved toward in-house standards. However, NAS523 remains active for:

• General Aviation repair (Cessna 172/182, Piper PA-28 series use 5056 rivets on rear fuselage skins).
• Military depot-level maintenance for legacy aircraft (C-130, CH-47, UH-60).
• Corrosion-critical environments (marine-based aircraft and helicopter rotor blades).

If an engineering order calls out NAS523, you must use a genuine 5056 rivet or an approved equivalent (e.g., NAS523A – a newer revision with tighter tolerances). nas523 rivet code pdf

3. Interpreting the Part Number Hierarchy

The NAS523 standard helps you break down the confusing string of letters and numbers found on a blueprint. Here is the logic you would find in the document: Deep Article: NAS523 Rivet Code (PDF) The Complete

Example Part Number: MS20470AD4-5

1. MS20470: The Head Style. (In this case, a Universal Head / Protruding Head).
   • Interesting Note: If this were MS20426, it would be a Countersunk (Flat) Head.
2. AD: The Material Code. (2117-T4 Aluminum, no refrigeration needed).
3. 4: The Diameter Code. The formula in the PDF tells you to multiply this by 1/32nd of an inch.
   • $4 \times \frac132 = \frac432 = \frac18$ inch diameter.
4. 5: The Length Code. The formula usually dictates multiplying by 1/16th of an inch.
   • $5 \times \frac116 = \frac516$ inch length.

What is an NAS523 Rivet?

The NAS (National Aerospace Standard) prefix indicates a fastener designed for high-performance aircraft environments. Specifically, NAS523 refers to a solid, protruding head rivet made of corrosion-resistant steel (typically A286 or similar superalloy). These rivets are used in airframe structures that require high shear strength and resistance to elevated temperatures (up to 800°F/427°C). General Aviation repair (Cessna 172/182, Piper PA-28 series

Unlike common aluminum rivets (e.g., NAS523's aluminum counterpart, NAS523-XX, though rare), the steel version is found in engine nacelles, wing attachment points, and supersonic aircraft skins. The "code" in "rivet code" refers to the alphanumeric shorthand used on engineering drawings and bill of materials (BOM) to denote exact dimensions, material condition, and coating.