一个假象圆柱或圆锥的直径，该圆柱或圆锥的母线通过牙型上的沟槽宽度等于1/2基本螺距的地方。
提供了一种简便易行、准确可靠的测量内螺纹单一中径的手段。
A simple, easy to use, correct and reliable for measurement of single pitch diameter of inner thread is provided.
通过对普通螺纹中径诸参数的几何分析，揭示出其单一中径与实际中径的内在联系与区别。
This article brings to Light the internal relations and difference between single pitch diameter and actual pitch diameter by means of geometrical analysis of several parameters of pitch diameter.
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