Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HS5999RH-04 found under Gasket by Boeing Company The. The National Stock Number assigned to this part is 5330014659461, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HS5999RH-04.