Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R5003 found under Cutter Milling Shell End by Niagara Cutter Inc. The National Stock Number assigned to this part is 3455002313529, and the Federal Supply Class is 3455 Cutting Tools For Machine Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R5003.