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。
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。
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。
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。
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