MIL-STD-1916 DOD Preferred Methods for Acceptance of ProductThe purpose of this standard is to encourage defense contractors and other commercial organizations supplying goods and services to the U.S. Government to submit efficient and effective process control prevention procedures in place of prescribed sampling requirements.

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MIL-STD-1916

5.2.2.2.2 Nonconforming unit. For the purposes of variables sampling, a unit of product shall be considered nonconforming if its variables measurement is outside the specified

tolerance.

5.2.2.2.3 Acceptability criteria. The lot or batch shall be considered acceptable if its sample contains no nonconforming units and the applicable "k" and "F" criteria (see Table III) are met. If the sample contains any nonconforming unit, or if the sample does not meet the "k" criterion, or if the sample does not meet the "F" criterion (when applicable), the lot does not meet the acceptability criteria.

a. k criterion, single-sided specification. For a single-sided specification the quantity

( x spec limit)

shall be greater than or equal to the k value specified in Table III in

order to meet the "k" criterion.

b. k criterion, double-sided specification. For a double-sided specification, each of the

quantities ( x L)

and (U x )

must be greater than or equal to the k value

specified in Table III in order to meet the "k" criterion.

c. F criterion (only applicable in double-sided specifications). For a double-sided

specification the quantity s

(U L)

must be less than or equal to the specified F

value in Table III in order to meet the "F" criterion.

Note: x = sample mean, s = sample standard deviation,

U = upper specification limit, L = lower specification limit.