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    Hello everyone,
    Can anyone resolve this!

    Our customer is accepting goods which follows AQL 2.5 then what Z-bench he is accepting the product to be at?

    Considering one unit as a one opportunity which may either pass of fail what percent defective he is ready to accept?

    Thanks in advance


    Tom K.

    The following is an excertp from a web site (

    It should be recognized that components produced in large volume are not exactly identical even though produced on only one machine. Inherent machine repeatability variations are the cause. The components produced are usually within the tolerance limits but a small percentage may not be within the tolerance. To allow for this variation, the military developed MIL-STD-105E (or latest revision), Sampling Procedures and Tables for Inspection by Attributes. This specification allows a small percent of imperfect components in any given lot. The percent of production allowed to exceed the tolerance limits is the Acceptable Quality Level (AQL).

    I also found some information at:

    I can’t seem to find any information about the “2.5”. I’m not sure if it is 2.5% defects allowed or 2.5 sigma or 2.5 dpmo. You’re guess is as good as mine.

    Good luck!


    Carol Steiner

    Acceptable Quality Level (AQL):
    the smallest percentage of defectives that will make the lot definitely acceptable; a level that the customer prefers.

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