Pitch diameter (d) is the diameter of the pitch circle.

节圆直径(D)：节圆直径是节圆所在圆的直径。

There are many ways to measure base-level pitch diameter of cone-shaped thread.

检测圆锥管螺纹基面中径的方法有很多，但测量过程复杂。

The pin gauges are used to measure the hole distance, the pitch diameter of the thread, etc.

针规适用于机械加工中孔径、孔距、内螺纹小径的测量，特别适于弯曲槽宽及模具尺寸的测量。

The taper and pitch diameter of API round thread casing are two of the most important parameters.

API圆螺纹的锥度和中径是两个重要的参数。

A simple, easy to use, correct and reliable for measurement of single pitch diameter of inner thread is provided.

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。