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1·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。

2·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。

3·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。

4·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。

5·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。

6·The errors of the stand-off measurement and measurement errors made by pitch diameter gauge and ovality gauge are analyzed and compared.

分析比较了紧密距测量以及中径和椭圆度量规测量的误差。

7·This paper describes a new method and device for measuring helical line, pitch diameter, taper and half-angle of thread of petroleum thread gauges.

本文介绍一种测量石油螺纹量规的螺旋线、中径、锥度和牙形半角的新方法及装置。

8·By the use of the displacing enveloping drawing method, a set of exact formulae for calculating the virtual pitch diameter is deduced and verified by measured data.

本文考虑了非对称三角形螺纹的螺距偏差和牙侧角偏差的各种组合对作用中径的共同影响，运用了包容图位移法，分析和推导出非对称螺纹作用中径的精确计算公式。

9·Both have the same pitch diameter at the top of the hole of internal threads or end of the pipe on external threads, and both have the same thread lengths or depths.

在内螺纹的孔的顶端或者外螺纹的管的端部拥有相同的中径，而且拥有相同的螺纹长度和深度。

10·The principle straightness error of cutting square in work-pieces can be controlled by choosing a suitable pitch diameter of the planetary gear in the machine tools.

选取适当的车头行星轮的分度圆直径，可以有效地控制车方原理的直线度误差。