Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5M988-5 found under Gasket by Monogram Aerospace Fasteners Inc. The National Stock Number assigned to this part is 5330001899424, 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 5M988-5.