NAS 1215

Fitting End – Standard Dimensions for Bulkhead Flareless Tube Connections
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 02/15/1958

NAS 1735

Nut, Self-Locking, Blind Rivet, Elliptical Head, Closed End, 450F
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 11/27/1989