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USL – Upper Specification Limit

USL, (Upper Specification Limit), is the greatest amount in which a process or product is within the acceptable performance limits.

This limit may be close to 3 sigma higher than the nominal or expected mean of any process or product.

There is usually a LSL, (Lower Specification Limit) also. A lot of products will only have one limit. Either an upper or lower control limit. These are sometimes called ‘One Sided Specs’. A Cp cannot be calculated for one sided specs.


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Last Updated: Saturday, 10-Jun-06 15:50:57 PDT