This paper describes the priciple and method of measuring the pitch diameter of a large diameter sawtooth thread with a single ball,and introduces in detail the measuring device to realize the method.

• 在普通螺纹中径合格性判定准则泰勒准则的基础上,提出只用螺纹实际中径的测量结果判定螺纹合格性的简单判定方法。