为了保证零件装配，并满足产品设计要求，介绍了延伸公差带的三种应用场合。
The applications of the extension tolerance zone are introduced in order to guarantee the assembly and design.
对引起螺纹孔延伸公差带失效原因的各种因素进行了分析，并对采取的预防措施进行了讨论。
Many factors which possibly lead to failure of extended tolerances of threaded holes are analyzed, and a discussion on the method of prevention is made.
对引起螺纹孔延伸公差带失效原因的各种因素进行了分析，并对采取的预防措施进行了讨论。
Many factors which possibly lead to failure of extended tolerances of threaded holes are analyzed, and a discussion on the method of prevention is made.
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