Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MODEL 604SB found under Clamshell Pipe Lathe by Tri Tool Inc. The National Stock Number assigned to this part is 3450013139571, and the Federal Supply Class is 3450 Machine Tools Portable. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MODEL 604SB.