Plug is used to measure the size of the workpiece precision measuring tools can be used as size reference. Commonly used plug a hole plug, and thread plug. 
 Thread plug types can be divided into ordinary coarse teeth, fine pitch, and three threaded tubes. Pitch of 0.35 mm or smaller, 2-level precision and accuracy than 2 threaded plug, and pitch of 0.8 mm or smaller three precision thread plug gauge not only the end of the probe. 100 mm below the taper thread plug for the plug thread. More than 100 mm for double-handle screw plug. 

 View on the thread gauge | ring | smooth plug | thread plug ring related content 
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