FF-S-85D
4.2
Sampling for lot acceptance.
4.2.1 Inspection lot. A lot shall consist of cap screws of the same type,
size, material, coating and thread series offered for delivery at one time.
4.2.2 Sampling for examination of cap screws. A random sample of cap screws
shall be selected from each lot in accordance with ASQ Z1.4, Inspection Level S-4.
The Acceptable Quality Level (AQL) shall be as indicated in table III. Unless
otherwise specified, the AQLs listed in this inspection shall be used to establish
the sample size, however, the acceptance number shall be zero.
Classification of defects.
TABLE III.
Defects
Inspection
Categories
method
Critical
AQL = 1.0 percent
1
Cracks (3.9.3)
Microscope or S.I.E.*
Major
AQL = 2.5 percent
101
Thread, size and form (3.3.1 and 3.3.2)
Thread ring gauge Go and No Go
102
Thread lengths (3.3.2)
S.I.E.*
103
Discontinuities (3.9.1)
S.I.E.*
104
Self-locking element missing, when
Visual
applicable (3.1.6)
Minor
AQL = 4.0 percent
201
Length (3.3.1)
S.I.E.*
202
Surface roughness (3.6)
Visual
203
Coated threads (when applicable) (3.3.3)
Visual
204
Head marking (3.8)
Visual
*Standard Inspection Equipment
4.2.3 Sampling for mechanical properties and metallographic tests. A random
sample of cap screws shall be selected from each lot in accordance with ASQ Z1.4,
Inspection Level S-1. The AQL shall be 1.5 percent defective.
4.2.3.1 Samples selected as specified in 4.2.3 may be used when practicable.
Three quarter inch and larger test specimens processed with the lot may be used
for destructive testing.
4.2.4 Chemical analysis. Chemical analysis shall be made in accordance with
ASTM E1282. When a certificate covering these requirements can be furnished, it
will be acceptable.
4.2.5 Sampling for packaging and packing. Sampling for inspection of packaging
and packing shall be in accordance with ASTM D3951.
4.2.6 Sampling for mercurous nitrate test. When specified (see 6.2), a random
sample shall be taken from each lot of cold-worked naval brass screws in
accordance with ASQ Z1.4, Inspection Level S-1. Any one defect shall cause
rejection of the represented lot.
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