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1·Sometimes the limit is allowed in only one direction. This is known as unilateral tolerance.

有时限度只在一个方向产生，这种行为即是单向公差。

2·Referring to the previous example, the hole is dimensioned 1.500, which represents a unilateral tolerance.

根据之前的例子，孔的尺寸是1.500，而其公差为单边公差。

3·The unilateral system permits changing the tolerance while still retaining the same allowance or type of fit.

单向体系允许在依然保留相同允差或配合类型的情况下改变公差。