Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 939840 found under Protractor Advc by U S Dept Of Transportation Federal. The National Stock Number assigned to this part is 5210014626741, 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 939840.