A Concentricity Checking Gauge is a precision inspection tool used to verify how accurately the central axis of one feature (like a spline, bore, or shaft) aligns with the central axis of another reference feature on the same part. It ensures that the features are truly concentric within specified tolerances, which is critical for proper fit, function, and balance in rotating machinery.

To check misalignment between two cylindrical or spline features. To ensure parts meet geometric tolerances for concentricity. To prevent vibration, uneven wear, and premature failure.