Summary Information (click on this NSN number for detailed information: 5310-00-001-1847)
Nut, also referenced with federal logistics item name code 1859:
A nut having a flat bearing surface and 6 flat sides with slots in its upper portion. it is designed to provide positive locking when used with a solid or split (cotter) pin. excludes nut (1), plain, castellated, hexagon.