Smooth limit gauge refers to the general name of the limit gauge used by the inspected workpiece for smooth holes or smooth shafts. Its structural design is simple, convenient and reliable, and the efficiency of inspecting parts is high. It is a fixed value inspection measuring tool without scale. The smooth limit gauge has the following six requirements:
    First, the measuring surface of the gauge should not have rust, burrs, black spots, scratches and other defects that significantly affect the appearance and quality of use, and other surfaces should not have rust and cracks.
    Second, the connection between the probe and the handle of the plug gauge should be firm and reliable, and should not be loosened during use.
    Third, the functional limit gauge should be bearing steelGCr15Such hard and wear-resistant materials are manufactured and should be treated for stability.
    Fourth, the hardness of the measuring surface of the gauge should be58HRC～65HRCWithin the scope;
    Five, through the plug gauge surface roughnessRaThe value should not be greater than0.4, surface roughness of the inner hole of the ring gaugeRaThe value should not be greater than0.2.

    6. The test of the functional limit gauge should be at temperature20℃The measurement force is zero.

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