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在蘇联标准公差制度中,有基孔制及基轴制二种。在一般机器制造中多採用基孔制。但只採用一种公差制度(基孔制或基轴制)往往不能满足机构上的要求,必须使基孔制与基轴制混合使用,并有时用不同精度等级的公差。例如系由按基轴制制造的孔与按基孔制制造的轴相连结而成。按其公差限界位置,所产生的公盈或公隙的大小,及適合於滑配合并能保持良好的中心性。与二级精度的动配合相近似。其配合之关系可参阅[图一]。
In the Soviet Union standard tolerance system, there are two kinds of base hole system and base axis system. In the general machinery manufacturing more base hole system. However, the use of a tolerance system (base or shaft) often fails to meet the requirements of the organization. It is necessary to use a combination of base-hole and base-shaft systems, sometimes with tolerances of different levels of accuracy. For example, it is made up of a shaft made by a base shaft and a shaft made by a base hole. According to its tolerance limit position, the resulting public welfare or the size of the public gap, and suitable for sliding with the merger can maintain a good centrality. And the second level of precision with the dynamic approximation. The relationship between the cooperation can refer to [Figure 1].