FF-S-85D
4.3
Examination.
4.3.1 Visual and dimensional inspection. Each cap screw selected as specified
in 4.2.2 shall be examined to verify conformance with this specification.
Examination shall be conducted in accordance with table III. Any screw having one
or more defects shall be rejected and if the number of defective screws in any
sample exceed the acceptance number of the sample, the lot represented by the
sample shall be rejected. Retests shall be in accordance with ASQ Z1.4.
4.3.2 Inspection of packaging and packing. Inspection of packaging and packing
including preservation and marking of packages and containers shall be in
accordance with ASTM D3951.
Test procedure.
4.4
4.4.1 The test specified in 4.4.2 and 4.4.3 shall be required, the tests
specified in 4.4.4 through 4.4.13 may be required at the option of the Government.
4.4.2 Hardness. Hardness test for cap screw shall be conducted in accordance
with ASTM E10 and ASTM E18 on transverse section through the threaded portion of
the screw, taken one nominal diameter from the point, or when too short, halfway
between the bearing surface and the point. Hardness shall be measured at a point
on the section, one quarter diameter from the axis of the screw. For screws three
quarter inch and larger, test may be made on a test specimen.
4.4.3 Tensile. Tensile test shall be conducted in accordance with ASTM F606.
Unless otherwise specified (see 6.2), Grade 2, low carbon steel screws shall not
be subjected to this test.
4.4.3.1 Full size specimens. When testing equipment is available cap screws
shall be tested full size, preferably using apparatus similar to that illustrated
in figure 2.
4.4.3.2 Turned shank specimens. For testing cap screws having tensile
properties greater than can be measured on available test equipment, the shank or
test specimen shall be turned down around the axis, to gage dimensions specified
in ASTM F606. For testing cap screws or test specimens too large for full size
testing, the specimen shall be turned, have its axis midway between the axis of
the shank and the surface of the shank, as illustrated in figure 4.
4.4.3.3 Ductility test specimens. Test for elongation and reduction in area
shall be conducted on turned shank specimens (figure 3) having dimensions to the
largest practical specimens (see 4.4.3).
4.4.3.4 Screws too short to be tensile strength tested as defined in ASTM F606
shall be hardness tested in accordance with NASM1312-6. If the hardness limits
are not specified, screws shall meet the minimum hardness requirement of the
material from which they were made.
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