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The rapid and accurate measurement of internally threaded holes is one of today’s more difficult measurement problems. QUEST Integrated, Inc., has built an electro-optic based internal/external thread measurement system. It measures internal thread sizes from 9 to 150 mm (3/8 to 6 inches) and may be inserted up to 75 mm (3 inches) deep. This is the first system capable of measuring the simple pitch diameters of internal thread forms. It also measures lead, flank angles, major, and minor diameters The non-contact method of the QC-30 Thread Measurement System enables in-process inspection by eliminating touch labor. It can measure blind holes, master gages, and production parts. The system works by calibrating to a master gage. It then scans other parts and fits a 3D thread model to the data. Inspection results are presented both numerically and graphically. The most commonly used methods for inspecting threaded parts are based on mechanical contacting gages.