Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1000601-X-ST-18-LS found under Lapping Tool Valve Seat by Krueger Robert E Inc. The National Stock Number assigned to this part is 5120013828875, and the Federal Supply Class is 5120 Hand Tools Nonedged Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1000601-X-ST-18-LS.