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通过最佳和非最佳二组三针跨线值Ｍ的测算，推导出采用非最佳三针按参数实际值进行螺纹单一中径和螺纹中径的精密测量的计算公式，这种方法简便易行，不需按传统三件测量方法的复杂的修正程序求解各参数的修正值。
Through the calculation of the optimum and non-optimum two groups of three-needle cross-line values M, the formula for calculating the precise measurement of the single thread diameter and the thread diameter by using the non-optimal three-needle actual values is deduced. This method is simple Easy to work without the need for a complicated correction program of the traditional three-piece measurement method to solve the correction of each parameter.