THREAD GAGE FOR CHECK OF EXTERNAL THREADS Russian patent published in 2001 - IPC

FIELD: measurement technology; check of external threads. SUBSTANCE: ring gage has rigid body with threaded part. End surfaces of body have flat bevels 4 at an angle equal to angle of inclination of helical line of thread γ. Boundary line 5 dividing plane of bevel 4 and end surface 3 of gage passes through axis of tapped hole of gage and point 6 of escape of thread to end surface. Bevel 4 is made on that half of end surface where initial half of the first turn of thread is formed. Bevel 4 begins on boundary line 7 passing tangentially relative to major diameter of thread at point 6 of escape of thread to end surface 3. EFFECT: enhanced accuracy of check of external threads. 2 dwg