Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 77656-31X6 PIECE 13 found under Shaft Shouldered by Electric Boat Corporation. The National Stock Number assigned to this part is 3040012200036, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 77656-31X6 PIECE 13.