Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4017020 found under Washer Bevel by Funk Mfg Co. The National Stock Number assigned to this part is 5310013599372, 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 4017020.