孔或轴允许的最小尺寸成为最小极限尺寸。
下偏差：零件最小极限尺寸减去其基本尺寸所得的差值。
Lower deviation: the difference between the minimum permissible size of a part and its basic size.
例外情况包括有最小尺寸为1.0米或在压力不大于80%的设计强度极限部分。
Exceptions include sections with a minimum dimension 1, 0 m or where the stress is not greater than 80% of the design ultimate strength.
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