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steel, carbon, fed QQ-S-631, 634 or 637, composition 1010, 1020, 1108 or 1119, cadmium plating, FED-QQ-P-416, class 3 type 2, surface harden to R15N 85 to 88 and to a depth of .015 to .030, 0.490 width, 0.875 length, 0.313 thickness, 1/4-28 UNF-2B, countersink 90.0 degrees plus or minus 10.0 degrees to 0.260 plus 0.020 diameter both side, lug length 0.281 lug width 0.240 minus 0.010, 0.245 center of threaded hole to outside edge along width and length
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).