In order to reduce problems existing during pressure gage installation in oil and gas production fields and raise the level of field standardization, described are the origin and industrial application status of 3 kinds of screw threads in accordance with relevant technical standards and historical data, conducted is analysis on various components required in pressure gage installation and commonly used screw thread types, introduced are common misconceptions involved during pressure gage installation in industrial production, emphasized is the importance of systematical knowing well technical knowledge of threads in pressure gage installation. Proposed are some suggestions for such aspects as material preparation, actual operation and revision of teaching materials and forecast is benign development of technology standards in screw thread and relative industries.