Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D77-944-20 PIECE 21 found under Key Machine by Electric Boat Corporation. The National Stock Number assigned to this part is 5315011831245, and the Federal Supply Class is 5315 Nails Machine Keys And Pins. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like D77-944-20 PIECE 21.