external screw thread [机] 外螺纹 ; [机] 阳螺纹
external screw thread finish 外螺纹瓶口
Make the pipes with button head align with the joints of external thread, rotate the nut and make it align to the center, knock the nut and screw up the nut.
将焊有球头的管子与外螺纹接头中心相对，旋转螺母使其自动对中心后，敲击螺母使螺母旋紧。
The intramedullary nail is mainly characterized by including a solid nail body, the upper section of which is an external screw thread rod and a copulate fixedly pressure-adding screw cap;
它的主要特征是包括实心体钉体，其上段为外螺纺杆及配合的固定加压螺帽；
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