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wbronze QQ-B-728 class a, 3.250 in. dia, 1.625 in. thk, two 0.391 in. dia holes 0.380 in. deep, nut surface, one 0.375-24 unf 3b thd, 0.340 in. deep on periphery, 1.625-2 acme 4g left hand thd thru center, 3.250-16 UN-3A thd on outside dia
Schedule B number: 7415390000
Other threaded fasteners nesoi of copper
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).