NAS 541

Involute Serrations – Internal 45 Pressure Angle Loose Fit
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 09/07/1983

NAS 459

Protection of Vendor Parts and Accessories Against Corrosion Specification for
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 09/30/1961

NAS 548

Screw – 100 Head, Type B Tapping, Frearson, Phillips, and Slotted Recess
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 05/01/1964

NAS 560

Screw-Machine, Non Magnetic High Temperature, Structural, 100 Flush Head
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 06/25/1980