Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P6421-AP found under Gasket by Acme Products And Engineering Inc. The National Stock Number assigned to this part is 5330010082827, 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 P6421-AP.