NAS 109

Welded Assembly – Tube, 1/2 O.D., Steel, 1/4 Threaded Rod Ends.
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 10/15/1946

NAS 1190

Screw, Self-Locking, Pan Head, Full Thread Cruciform and Offset Cruciform Recess
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 01/01/2001