The present invention relates to an improved key groove depth to improve the machining section density and improve the quality of the maintenance work by accurately measuring the depth of the workpiece in conformity with the curvature of the peripheral surface of the workpiece from the outer circumferential surface of the circular cross-To a measuring jig.;The present invention relates to a body having a lower surface forming an inclined surface opposed to each other, a handle being protruded on both sides thereof, a protruding block formed on the front surface side, a guide hole and a fixing bolt vertically penetrating the center, A plurality of dial gauges each having a hole formed on both sides of the protruding block of the body, inserted and fixed in the hole, and fixed so that probes protrude from the hole by the same length, respectively; And a burr caliper which is fitted in the guide hole of the protruding block and is fixed by the fixing bolt and measures the depth of the key groove from the outer peripheral surface of the workpiece.;According to the present invention, the height of the burr caliper is aligned with the curvature of the outer circumferential surface of the workpiece from the outer circumferential surface of the circular workpiece having the keyway to the bottom surface of the keyway, and the depth of the burr caliper is accurately measured. An improved practical effect is obtained so as to improve the quality of the work.
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