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 Navy 
Italy Classification: Press-fasteners, snap-fasteners & press-studs & parts therefor
NSN 6135-01-031-8078
NSN 5930-01-192-5198
NSN 6130-00-725-0066
NSN 6150-01-054-0310
NSN 5996-01-039-2704
NSN 5935-00-847-4821
NSN 6220-00-973-9416
NSN 6650-01-564-6681
NSN 5999-01-603-5409
NSN 6645-01-411-5657
NSN 4140-01-597-8726
NSN 5895-01-415-3114