Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1820-001 found under Nut Plain Extended Washer Hexago by Clay And Bailey Manufacturing. The National Stock Number assigned to this part is 5310013347388, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1820-001.