MIL-DTL-87104C
e. Selection and application. In any design utilizing metallic castings, consideration should be given to
intended application, the availability of molding and casting alloys, the choice of a suitable casting
process and the use of ribs and fins. Repair of minor discontinuities or defects in unmachined or
raw castings should be permitted only when specific appproval has been granted.
3.3.1.4 Corrosion resistance. Materials shall be of corrosion-resistant types or shall be processed to resist
corrosion.
3.3.1.5 Ferrous alloys. Ferrous alloys are to be in accordance with MIL-STD-889. Alloys should be corrosion
resistant or should be coated or metallurgically processed to resist corrosion. The environmental severity to which
the equipment will be exposed should be considered in selection of metals.
3.3.1.6 Dissimilar metals. Selection and protection of dissimilar metal combinations are to be in accordance with
3.3.1.7 Fungus-inert materials. Fungus-inert materials, defined as materials which, in all modified states and
grades, are not nutrient to fungi, must be used.
3.3.1.8 Arc-resistant materials. Arc-resistant materials shall have passed the minimum criterion of 115 seconds
when subjected to the arc-resistance test of ASTM-D495.
3.3.1.9 Soldering. Soldering is to be in accordance with J-STD-001, including assembly, soldering, cleaning and
workmanship (see 3.3.2.1.8).
3.3.1.10 Threaded parts. Threaded parts are to be selected and applied as specified (see 6.6). The use of metric
threads shall be coordinated with the acquiring activity and shall require approval prior to use.
3.3.2 Detailed requirements.
3.3.2.1 Coaxial connectors and adapters.
3.3.2.1.1 Brass. Brass parts shall conform to ASTM-B36/B36M and ASTM-B121/B121M, composition 2, half-hard;
3.3.2.1.2 Copper-beryllium. Copper-beryllium parts shall conform to ASTM-B196/B196M, ASTM-B197/B197M,
and ASTM-B194, condition H. Parts fabricated of copper-beryllium shall be heat-treated to condition HT after
machining and forming.
3.3.2.1.3 Aluminum alloy. Aluminum alloy parts shall be in accordance with SAE-AMS-QQ-A-225 and ASTM-
B211, Al 6061-T6, or approved equivalent.
3.3.2.1.5 Phosphor bronze. Phosphor bronze parts shall conform to ASTM-B139/B139M.
3.3.2.1.6 Silicone rubber. Silicone rubber shall conform to A-A-59588, class 1b, grade 50.
3.3.2.1.7 Polytetrafluoroethylene (Teflon). Polytetrafluoroethylene shall conform to ASTM-D1710, except that:
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The dielectric constant at 10 cycles shall be within 1.95 to 2.15; the dissipation factor at 10 cycles shall not exceed
0.0002; specific gravity shall be within 2.15 to 2.18; tensile strength shall be 3,500 psi minimum; elongation shall be
350 percent maximum; and dielectric strength shall be minimum of 900 volts per mil when measured on .040 inch
(1.02 mm) sample. Only clean, unreprocessed, virgin polytetrafluoroethylene shall be used. Parts fabricated of
polytetrafluoroethylene shall have no visible flaws or cracks.
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