Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 424-642 found under File Rotary by Olympus Ndt Ne Inc. The National Stock Number assigned to this part is 3455008801311, 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 424-642.