FSC 5310 Nuts and Washers

FSC 5310 is the U.S. Federal Supply Class for Nuts and Washers, in Federal Supply Group 53 (Hardware and Abrasives). Aviation Parts Executive lists 1,592 parts whose part numbers carry a National Stock Number (NSN) in this class. Search any NSN or NIIN on our site to open the part.

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.

Includes locknuts; eye nuts; plain nuts; castellated nuts; wing nuts; plate nuts; push on nuts; concave and convex washers; flat washers; keyed washers; lock washers; shouldered washers; split washers.

Excludes bearing thrust washers (FSC 3120); shims (FSC 5365); ring spacers (FSC 5365); plate spacers (FSC 5365); lock rings (FSC 5365).

Our Parts In FSC 5310 (1,591)

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NSNs, item names and Federal Supply Class descriptions come from the Defense Logistics Agency's public Federal Logistics Information System data (PUB LOG, October 27, 2026 release). We show an NSN only when the government record lists our part number under the same manufacturer (CAGE code). Confirm the NSN and part number on your solicitation before you order.