FF-S-200B
4.4.2 Decarburization. Each setscrew taken as specified in 4.2.3 shall
be subjected to a decarburization test conducted as follows: The threaded
part of the setscrew shall be sectioned longitudinally through the axis and
polished so that rounding of the thread edges is held to a minimium. The
section shall be etched with the usual metallographic etchants (such as
nital) and examined with a metallurgical microscope. Measurements shall be
made from the crest of the thread to the end of the decarburized zone. This
distance shall not exceed that indicated in Figure 1. Measurements shall be
made with a fixed-scale micrometer eyepiece. This test does not apply to
austenitic corrosion-resisting steel and brass alloy.
4.4.3 Protective finish. Protective finish tests shall be conducted in
accordance with the applicable specifications in 3.2.
4.4.4 Chemical analysis. Each setscrew selected as specified in 4.2.6
shall be subjected to a chemical analysis conducted in accordance with
ASTM E172 or ASTM E1282, to verify conformance to the applicable material
specification. A steel mill certification will be acceptable in lieu of this
test.
4.4.5 Hydrogen embrittlement. The contractor shall furnish the
Government certification that cadmium plated or zinc plated alloy steel
setscrews have been subjected to the embrittlement relief treatment specified
in 3.2.4.
5.
PACKAGING
5.1
Packaging. For acquisition purposes, the packaging requirements
shall be as specified in the contract or order (see 6.2). When packaging of
materiel is to be performed by DoD or in-house contractor personnel, these
personnel need to contact the responsible packaging activity to ascertain
packaging requirements. Packaging requirements are maintained by the
Inventory Control Point's packaging activities within the Military Service or
Defense Agency, or within the military service's system commands. Packaging
data retrieval is available from the managing Military Department's or
Defense Agency's automated packaging files, CD-ROM products, or by contacting
the responsible packaging activity.
6.
NOTES
6.1.
Intended use. Setscrews covered by this specification are
intended to be used to locate machine parts in relation to each other, either
permanently or temporarily. It is recommended that cup point setscrews,
style 4, be used wherever possible. For hardened shafts or when the cutting
in of the cup point is objectionable, styles 1 or 6 should be used. It is
recommended that styles 2, 3 or 5 be used only when it is impractical to use
the other styles.
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