Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MY20277-003 found under Washer Key by Dassault Aviation. The National Stock Number assigned to this part is 5310142971313, 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 MY20277-003.