螺纹件： 机器结构中带连续螺旋肋的圆柱形件，用作紧固件或力和运动变换装置。
Screw: In machine construction, a usually circular cylindrical member with a continuous spiral rib or thread, used either as a fastener or as a force and motion modifier.
所述连接体为圆柱形且设有两个螺纹孔，所述钻杆末端安装在所述螺纹孔中。
The connecting body is cylindrical and provided with two threaded holes; the tail end of the drill pipe is arranged in the threaded holes.
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