Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 049910-412 found under Optical Flat by Van Keuren. The National Stock Number assigned to this part is 5210002139061, 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 049910-412.