Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4B8407-00 found under Washer Flat by Mil Tech Mfg Inc. The National Stock Number assigned to this part is 5310002460266, 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 4B8407-00.