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1aluminum; first step 4.500 in. dia by 0.500 in. lg; second step externally thd 4.188 in.-12Un rh thd size, 0.500 in. thd lg; thrid step 4.000 in. dia by 0.250 in. lg; first step counterbored 3.688 in. dia by 0.250 in. deep; 3.437 in. bore dia
1EA
Schedule B number: 7616106000
nmfc 093486
Threaded fasteners of aluminum
FSC 5310 ⁓ Nuts and washers
Note-nuts and washers, including specially designed, are to be classified in this fsc. a. nuts are a small metal block made in a variety of shapes such as square and hexagonal which is drilled and internally threaded. b. washers are a perforated piece of metal, leather, or other materials of various shapes or forms. they are used primarily as a seat for a bolt, nut, screw, rivet or nail to distribute pressure and prevent endwise motion over an area and/or to prevent movement between two parts by means of restraining features created by the shape of its edges.
Excluding bearing thrust washers (fsc 3120); shims (fsc 5365); ring spacers (fsc 5365); plate spacers (fsc 5365); lock rings (fsc 5365).