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navy special project
steel ams 5643, passivated MIL-F-14072 finish E300, 10-48 uns 3b thread, metallic hardness rating rockwell c scale 40 min 45 max, 0.190 in. min 0.192 in. max counterbore diameter, 0.110 in. counterbore depth, 0.375 in. across flats, 0.280 in. nut height, 0.3123 in. min 0.3125 in. max bearing surface diameter
Schedule B number: 7318160000
nmfc 093486
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).
navy special project