NAS 512

Specification – Coupling; Flexible, Fuel for One Inch Through Four Inch Tube Sizes
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 05/30/1963

NAS 1511

Heat Treatment and Processing Requirements for 5% Cr Ultra High Strength Alloy Steel (H-11) Fasteners
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 11/01/1980