provides an extensive PDF on general fastener selection, materials, and strengths. Core Specifications for Technicians NAS523 Rivet Identification Guide | PDF - Scribd
| Feature | NAS523 | NAS412 | AN960 | | :--- | :--- | :--- | :--- | | | Non-Metallic (Nylon, Teflon) | Metallic (Steel, Corrosion resistant steel) | Metallic (Aluminum, Brass, Steel) | | Washer Type | Captive (retained on screw) | Flat | Flat / Countersunk | | Primary Use | Insulation, Anti-vibration, Sealing | Structural joints, High load | General aviation, Low cost | | Plating Req. | Not applicable (non-metal) | Cadmium or Zinc | Cadmium or Phosphate |
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Non-metallic washers melt or deform. Standard NAS523 washers are typically rated for -65°F to +250°F. If your application exceeds 250°F, you must specify a special material variant (e.g., Polyimide) or switch to a metallic standard.
Comprehensive Guide to NAS523: The Universal Aerospace Fastener Code provides an extensive PDF on general fastener selection,
While the full document runs several pages, the core technical sections of the NAS523 standard generally cover the following areas. (Note: Always refer to the official PDF for exact values.)
: Represents the MS20470AD (Universal Head, 2117 aluminum alloy). Standard NAS523 washers are typically rated for -65°F
Without the document, a manufacturer cannot legally claim that their fastener assemblies meet AIA standards. The PDF acts as the legal and technical contract between the supplier and the buyer.