The item is a flight safety critical aircraft part (fscap).
A cylindrical item which may have wrenching and/or driving facilities and/or shoulders. It is designed to be inserted in a drilled or a pretapped hole, or molded or pressed into soft material to reduce the size of a tapped hole; to provide threads; to add strength, and/or to prevent stripping. It is one of the following: (1) a one-piece, flanged or unflanged, internally threaded item which may have external threads, and/or serrations around the periphery of the collar, designed to engage a serrated lock ring which is not included with the item; (2) a one-piece precision coiled wire; (3) a two-piece item consisting of an internally threaded cylinder and a mating externally threaded part; or (4) a one-piece internally threaded item whose outside diameter is tapered and/or knurled and/or with fin(s). The internal thread of the item may have a locking feature. Excludes items having a sleeve on its underportion which can be clinched or crimped. Excludes bushing, machine thread; nut, plain, knurled; nut, plain, round; nut, plain, clinch and nut, self-locking, clinch. See also nut, plain, plate.
Dept. of the Army 
Dept. of the Air Force 
Defense Threat Reduction Agency 
U.s. Marine Corps 
Dept. of the Navy 
Government Printing Office 
National Aeronautics and Space Administration 
Austria 
Finland 
Lithuania 
Slovenia 
Poland 
Bulgaria 
Brazil 
Spain 
Columbia 
Israel 
Singapore 
Morocco 
Malaysia 
Australia 
Belgium 
Canada 
New Zealand 
France 
Germany 
Republic of Korea 
United Kingdom 
Netherlands 
Portugal 
Italy 
Denmark 
Norway 
Greece 
Turkey 
NATO Maintenance and Supply Agency Classification: Press-fasteners, snap-fasteners & press-studs & parts therefor
NSN 5975-01-442-8585
NSN 6645-01-335-3299
NSN 5985-00-100-4902
NSN 5965-01-272-4199
NSN 4140-01-166-5049
NSN 6650-01-406-7765
NSN 5835-01-597-4820
NSN 6220-01-481-3827
NSN 5935-01-429-3706
NSN 6685-00-553-8733
NSN 5895-00-145-7780
NSN 6220-01-503-9193