上述塑料层的一开口端内表面开设有螺纹，该塑料层上的螺纹与金属嵌件上的螺纹相连接。
The inner surface at one open end of the plastic layer has the thread, and the thread on the plastic layer is connected with the thread on the metal insert.
在工具和管子的两端安装带螺纹的接头将工具或管子连接起来。
To connect tools or tubulars by assembling the threaded connections incorporated at either end of every tool and tubular.
固定螺纹连接部位的一端，以便在转动另一端时上紧螺纹。
To hold one end of a threaded connection while the other is turned to make up the joint.
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