Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SM7257-2PC56 found under Gasket by Bayer Co The. The National Stock Number assigned to this part is 5330002856546, 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 SM7257-2PC56.