螺纹 Screw thread
（重定向自National fine）
螺纹（Screw thread）是一个环绕圆柱体侧面的螺旋倾斜面的连续凸起（此凸起又称为「螺牙」）。
若以螺纹位置区别， 螺旋线位在圆柱体或圆锥的外表面者为外螺纹，而螺旋线位在圆柱孔或圆锥孔的表面者称为内螺纹。若按照螺旋线旋转方向来分类，以顺时针方向旋转向前螺旋推进为右螺纹，依逆时针方向旋转螺旋推进为左螺纹。
螺纹在机械工程应用非常广泛，经常使用于机件的链接和动力传递等。
National fine
中文百科
英语百科
Screw thread 螺纹
（重定向自National fine）
A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is the essential feature of the screw as a simple machine and also as a fastener.
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