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30103-016 manufacturers standard
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).
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A nut having a flat bearing surface and 6 flat sides with slots in its upper portion. an integral feature is incorporated for locking on the threads of a mating member. the slots, when used in conjunction with a solid or split (cotter) pin, act as an extra "fail safe", feature in critical applications. excludes nut (1), self-locking, castellated, octagon.