Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number N9-21-16X20 found under Gasket by Bofors A B. The National Stock Number assigned to this part is 5330121564524, 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 N9-21-16X20.