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基于孔、轴尺寸和装配尺寸三个分布之间的关系系统阐述了配合能力指数的概念及表达式，从而为由已知孔、轴配合零件批的统计参数预测和控制配合性质和装配质量提供一个评价尺度。这种基于配合能力和工序能力分析所发展的配合尺寸的统计参数设计和协调加工，可用现有的制造系统实现更高的装配精度，从而提供了一种新的精益生产模式。
Based on the relationship between the distribution of hole, shaft size and assembly size, the concept and expression of co-operation ability index are systematically expounded so as to provide prediction and control of the matching properties and assembly quality by the statistical parameters of known holes and shaft cooperating parts lot An evaluation scale. This statistical parameter design and coordinated machining based on fit capabilities and process capability analysis with the aid of the available dimensions allow a higher level of assembly accuracy with existing manufacturing systems and provide a new lean manufacturing paradigm.