Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FI21.72AGB 350MM PN17 found under Nut Plain Hexagon by Naf Ab. The National Stock Number assigned to this part is 5310014257202, 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 FI21.72AGB 350MM PN17.