Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 294-021-964-3440 found under Seal Non Metallic A by Greene Tweed And Co. The National Stock Number assigned to this part is 5330014812850, 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 294-021-964-3440.