MIL-DTL-3390H
TABLE II. End item visual defects - Continued.
Examination
Defect
Construction and workmanship
Sharp edge or projection that may cause injury
Cracked, broken, bent, malformed, or damaged
Pronounced tool or forming marks
Casting
Miscast, incomplete, or contains blowholes or
evidence of porosity
Roller (when applicable)
Does not turn freely
Joint not butted
Workmanship of welds
Weld or brazing missing, unless welding is not
or brazing
required
Completely broken or not fused
Cracked, partially broken, incomplete, or evidence
of poor fusion or burn through
Evidence that weld contains gas pockets or has been
undercut or that excess flux or spatter has not been
removed
4.3 Conformance inspection. Unless otherwise specified herein, sampling for
conformance inspection shall be performed in accordance with ASQ Z1.4.
4.3.1 Lot definitions. The lot definition is directly related to the stage of manufacturing
at which a sample is taken.
4.3.1.1 Material composition test for copper-nickel-zinc (nickel silver) alloy. For
purposes of sampling, a lot shall consist of material taken from one manufacturing run. Each test
sample will be 4-ounces (oz). The lot size will be determined by dividing the weight of the lot
by 4 oz. Example: a 100 pound lot will be considered to have a lot size of 400.
4.3.1.2 In-process visual examination. The lot size shall be the number of in-process
rings of one configuration, class, and size, manufactured using the same materials and processes.
The lot shall be unfinished rings without rollers.
4.3.1.3 End unit inspection. The lot size shall be the number of finished rings of one
configuration, class, size, and style if applicable, manufactured using the same materials and
processes.
4.3.2 Sampling plan. Unless otherwise specified, sampling procedures for conformance
inspections and examinations shall be in accordance with 4.3.1 and ASQ Z1.4, inspection level
S-3. Acceptance quality limits (AQL) will be as specified in the contract (see 6.2).
4.3.2.1 Sampling for material composition test for copper-nickel-zinc (nickel silver)
alloy. A random sample of 4 oz test samples shall be selected from each lot and subjected to the
inspection specified in 4.3.3.
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