NAS

Nut, Self-Locking, Plate, Two Lug, Floating, Variable Counterbore, Replaceable Nut Element, 125Ksi Ftu, 450 degrees F and 800 degrees F
Data Sheet by Aerospace Industries Association - National Aerospace Standard, 05/29/2015

Nut - Self-locking, Counterbore Replaceable Element
Data Sheet by Aerospace Industries Association - National Aerospace Standard, 10/21/2003

Bit, Six Lobe Recess Driver, Specification
Data Sheet by Aerospace Industries Association - National Aerospace Standard, 04/18/1990

SCREW, HEX HEAD, CRUCIFORM RECESS, FULL THREAD, ALLOY STEEL, 160 KSI FTU
Data Sheet by Aerospace Industries Association - National Aerospace Standard, 11/01/2008