Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HS4312 1 4000 found under Seal Nonmetallic Sp by Mcdonnell Douglas Helicopter. The National Stock Number assigned to this part is 5330014972072, 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 HS4312 1 4000.