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baluminum alloy 5052, QQ-A-250/8, chemical film, type 2, grade c, class 3, MIL-C-5541, 3.500 in. plate outside dia, 2.590 in. min, 2.610 in. max plate inside dia, four holes, 0.187 in. min, 0.189 in. max 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).