Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 42 073 found under Level And Plumb by Stanley Proto Industrial Tools. The National Stock Number assigned to this part is 5210016061530, 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 42 073.