Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 45520 found under Nut Plain Round by Westinghouse Electric Corp. The National Stock Number assigned to this part is 5310002083367, 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 45520.