The gluing mechanism of API round thread casing and tubing is analyzed.
分析了API圆螺纹油套管发生粘扣的基本过程及机理。
The taper and pitch diameter of API round thread casing are two of the most important parameters.
API圆螺纹的锥度和中径是两个重要的参数。
There exists a spiral clearance space in the API round thread casing joint which is effected by the thread tolerance ranges.
API套管圆螺纹自身存在牙间间隙，并形成螺旋状空间间隙带。
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