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steel, sae 1141 or sae 1144, rockwell c sale 24 to 32 hardness, 6.906 in. lg o/a, base 1.845 in. dia, 0.250 in. lg, hex wrenching facility 1.865 in. min, 1.875 in. max across flats, 1.994 in. min, 1.996 in. max dia of corners, 0.625 in. lg, internal thd, 1.375 in.-18 unef 3b size, 0.595 in. lg, internally drilled, hole in. top 0.500 in. min, 0.502 in. max dia, 0.318 in. min, 0.324 in. max lg,
1EA
Schedule B number: 7318160000
nmfc 133300
Nuts of iron or steel
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).