If the measured thread plug ring and screw thread to pass through the rotary joint regulation, and regulation ended with the thread, not entirely through the rotary joint (screw only regulation allowed only two rotating threaded together with the measured, the amount of no more than two co-rotating pitch ) to indicate that the role of the tested screw diameter does not exceed its maximum diameter solid tooth type, and the diameter of a single entity does not exceed the minimum diameter tooth type, you can guarantee the rotary joint and joint strength, were Thread diameter measuring compliance. Otherwise failed. Thread plug ring there are two detection methods: an integrated test and individual test. 
 Comprehensive testing is the amount of regulations on the interchangeability of the geometrical parameters of thread, the combined result of deviation tested. These include: using only common thread gauge and thread rules were in effect on the measured diameter (including the bottom diameter) and a single inspection in diameter; use the smooth limit gauge the actual thread on the top of the measured diameter of the test. 
 Thread gauge, also known as threaded plug ring, thread plug ring threaded through the maximum size of an entity to be measured tooth type, the role of test diameter measured thread is over its maximum diameter solid tooth type, and also examined the bottom diameter actual size is over the maximum physical size. 
 Test method: thread plug ring and the thread if the test thread can pass through the rotary joint regulation, and regulation ended with the thread, not entirely through the rotary joint (screw only regulation allowed only two rotation together with the measured thread, screw joint shall not exceed two pitch) to show that the role of the tested screw diameter does not exceed its maximum diameter solid tooth type, and the diameter of a single entity does not exceed the minimum diameter tooth type, you can guarantee the rotary joint and connection strength , the measured pitch diameter qualified. Otherwise failed. 
 Pitch diameter, said plainly, is the nominal diameter of thread that is referred to the thread "M **" in the * represents the value, it is a range of large diameter (outer thread diameter of the top of the teeth, as tooth thread bottom diameter) and trails (with the opposite meaning of a large diameter) with a diameter of between. 
 Maximum material tooth type, the name suggests, is the thread tooth type (Do not tell me that you even "tooth-type" do not know anything oh ~) manufactured to achieve maximum physical, that is, out of the actual processing time than the theoretical design, the and in the error range can reach the maximum volume on the state. 
 Shaft (male) of the maximum physical dimensions reflected in the diameter, shaft diameter is greater than the design size; hole tired parts (female) reflected in the maximum physical size of diameter is less than the design size of the hole diameter 

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