Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9-40091 found under Plumb Bob by Sears Roebuck And Co. The National Stock Number assigned to this part is 5210013989186, and the Federal Supply Class is 5210 Measuring Tools Craftsmens. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 9-40091.