Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 137661 found under Tape Measuring Replacement by Mechanical Technology Inc. The National Stock Number assigned to this part is 5210003472591, 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 137661.