Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31-16-8408 found under Bar Metal by Electric Boat Corporation. The National Stock Number assigned to this part is 9510005549161, and the Federal Supply Class is 9510 Bars And Rods. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 31-16-8408.