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 6150-01-407-4626
NSN 5985-00-226-6846
NSN 6150-01-370-3607
NSN 4140-01-461-2350
NSN 6645-01-306-9461
NSN 5920-01-499-0549
NSN 5990-01-160-6978
NSN 6650-00-262-2324
NSN 5930-00-952-2639
NSN 6685-01-453-2222
NSN 6150-00-884-8530
NSN 6135-01-166-5042