Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 87631-0104 ITEM 4 found under Shoe Bearing Aft by Electric Boat Corp. The National Stock Number assigned to this part is 3040010759878, 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 87631-0104 ITEM 4.