Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AD4031F found under Seal Plain Encased by Freudenberg Nok General Partnership. The National Stock Number assigned to this part is 5330012997634, 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 AD4031F.