Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NPR50.5 TS20 found under Insert Cutting Tool by Tool Serv. The National Stock Number assigned to this part is 3455004272652, 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 NPR50.5 TS20.