Gongyi with a threaded plug inspection criteria: In the thread specification, there are scattered along the thread profile of Gongyi Gongyi diameter with power and value of each table. Chinese workers do much skill are considered thread gauge inspection failed product, which should fall within the thread type screw Gongyi rules with limitations specification, thread quality should not have a title. When they find a threaded pass product quality is very poor, they know what to do, I do not know the title out there. In practice, the thread is a complex geometry, it has a lot of skill parameters. Assuming complete quality control thread (Gongyi with standards adopted), the demand for all parameters measured thread, which should spend a lot of time and high testing costs. And differences in the workplace, the effect of various parameters threaded differences, requirements are differences, some parameters can be applied to ensure that the production process, without having to own inspection. Currently, the only regulation of the use of a threaded pass from Taylor's original guidelines created by the British in 1905. Its strength is the economy is good, you can guarantee the assembly; drawback is the low level of quality guarantee thread, there is a lot of skill flaws. China should carefully discuss and Kam commandment American thread inspection system skills (specification) to improve the level of our manufacturing thread. 

keywords: Threaded plug, threaded ring, smooth plug, smooth ring,