A metal coupling device consisting of an oblong piece internally threaded at both ends into which the two sections of a threaded rod are screwed in order to adjust the tension of the rod.
英
美
释义
花篮螺丝,松螺旋扣一种金属的连接环呈椭圆形,两端有内旋螺纹,用来拧紧带螺纹的拉杆的两个部分从而调整拉杆的张力
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