Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number STN-54C found under Shim Seat Insert Cutting Tool by Valenite Inc. The National Stock Number assigned to this part is 3455010637690, 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 STN-54C.