NAS 230

Screws – Brazier Head, Frearson Recess, Alum. Alloy, Bronze and Alloy Steel, 1/4-28
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 03/15/1958

NAS 216

Screws – 100 Flat Head, Frearson Recess, Alum. Alloy, Bronze and Alloy Steel, 3/8-24
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 11/01/1947

NAS 1823

Interconnecting Devices, Electrical, Wire Terminating, Bussing Arrangement, Blocks, Non-Feedthru, Contact Size 20
Data Sheet by Aerospace Industries Association – National Aerospace Standard, 10/31/1971