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While the actual NAS523 PDF contains the precise engineering drawings, users generally look for the following data points when specifying or inspecting these nuts:
| Feature | Specification Detail | | :--- | :--- | | Material | Usually A286 CRES or Alloy Steel (cadmium plated). | | Thread Class | Typically UNJF (Unified Fine), Class 3B. | | Temperature Range | Dependent on the locking insert material; metal-to-metal locking versions can often withstand temperatures exceeding 450°F (232°C). | | Tensile Strength | High strength; specific values depend on the dash number (size) of the nut. | | Drive Style | Hexagonal drive (standard box wrench or socket fit). | nas523 pdf
No. MIL-W-5425 is a military specification for washers, specifically for corrosion-resisting steel. NAS523 is a National Aerospace Standard specifically for non-metallic captive washers. While the actual NAS523 PDF contains the precise
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. | | Tensile Strength | High strength; specific