Smooth plug is used to measure the workpiece size precision measuring tools, made of smooth plug limits the maximum size limit and minimum size of two. One end of its minimum size limit is called the pass side, one end of the maximum size limit is called the only side in the measurement should pass through the trail-side plug, and plug the rules should not only through the end of the path. Regulations limit the amount of smooth hole 
 Smooth plug Specifications: all kinds of smooth plug IT6 above (including 6) 1.6 ~ 320mm diameter and a variety of smooth ring on the bezel: diameter φ8-400mm accuracy of ± 0.002 
 1, smooth plug standard conditions of measurement: temperature 20 ℃, force is zero. 
 2, the maximum physical dimensions of the workpiece (ie, the smallest hole, the axis limits for the maximum size) of the General Regulation, said gauge. 
 The smallest physical dimensions of the workpiece (ie, the largest hole, the axis limits for the minimum size) said the only regulation gauge. 
 3, in line with the principle of ultimate size of judgments (ie Taylor principle) of the gauge as follows: 
 Through regulation of the measuring surface should be shaped with the hole or shaft corresponding to the complete surface (often referred to as full-form gauge), and its size is equal to the maximum physical size of the workpiece, and a length equal to the match length. 
 Only the rules should be the point of measurement of surface shape, and size between the two measuring surface is equal to the minimum physical size of the workpiece. 
 Consistent with the principles of Taylor, gauges, such as the application is not convenient in some situations or difficulties, in the shape of the workpiece to be examined to ensure that the error would not affect the nature of the conditions with the use of Taylor's departure from the principle of gauge. 
 4, with the interests of the standard gauge of the workpiece, such as the pass through rules, only regulation can not, the workpiece should be qualified. 
 5, the factory inspection of the workpiece, the operator should use the new rules, or through less wear and tear; inspection departments should use the same form with the operator, and has worn through more regulation. 
 User acceptance on behalf of the workpiece in the amount of regulation, through regulation should be close to the maximum physical size of the workpiece, only the rules should be close to the minimum physical size of the workpiece. 
 6, with the interests of the standard gauge of the workpiece, such as judging disputes, should be used to solve the following gauge size; 
 General rules should be equal to or close to the maximum physical size of the workpiece; 
 Only the rules should be equal to or near the minimum physical size of the workpiece; 

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