Hole plug gauge is a smooth limit gauge, is a special size measuring tool without scale, used to check the diameter of smooth holes. The following points should be noted when using the hole plug gauge:

    1Check the measuring surface of the plug gauge before use, and there can be no rust. Edge, scratches, black spots, etc.; The marking of the plug gauge should be correct and clear.
    2The function of the plug gauge must be within the periodic verification period, and accompanied by a verification certificate or mark, or other documents sufficient to prove that the plug gauge is qualified.
    3Standard conditions for plug gauge measurement: temperature is20°CThe measured force is0. It is difficult to meet this requirement in actual use. In order to reduce the measurement error, try to use the plug gauge and the measured part to measure under isothermal conditions, the force used should be as small as possible, and it is not allowed to push the plug gauge into the hole or push it while rotating.
    4When measuring, the plug gauge should be inserted or pulled out along the axis of the hole, and cannot be tilted; Plug the gauge into the hole, do not turn or shake the plug gauge.
    5The plug gauge is not allowed to detect unclean workpieces.
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