MIL-DTL-55235A
3.3.3 Insulator. The insulator shall be made of fluorinated ethylene propylene (FEP) in accordance
with ASTM D2116-81. The insulator shall have no visible flaws or cracks, and shall have a dielectric
constant and dissipation factor (tangent of loss angle) not greater than 2.1 and 0.0002, respectively, when
measured between 50 and 100 megahertz. Only clean, unreprocessed, virgin TFE or FEP shall be used.
3.3.4 Gasket. The gasket shall be made of silicone rubber conforming to Class II, Grade 50 or
60 of Specification A-A-59588 except that the oil-immersion test is not applicable.
3.3.5 Solder. Shall be in accordance with J-STD-006.
3.3.6 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar
metals, as defined in MIL-STD-889, shall not be used in intimate contact. Where it is necessary that any
combination of such dissimilar metals be assembled, an interposing metal compatible to each shall be
used.
3.3.7 Corrosion resistant materials. Materials shall be of the corrosion resistant types or shall
be processed to resist the corrosion tests specified herein, after which the connectors shall be
serviceable.
3.4 Design and construction. The design, construction, and physical dimensions of the mating
ends of the connectors shall be as specified on Drawings SC-D-358720 and SC-D-358721, as applicable.
3.4.1 Silver plating. The silver plating on metal parts shall be not less than 0.0005 inch thick for
exposed surfaces and 0.0002 inch thick for internal surfaces. An exposed surface shall be defined as a
surface which is subjected directly to the environments in the mated condition (i.e. outer shall, coupling
nut, etc.). Silver plating shall be in accordance with ASTM B700. Dimensions of metal parts shall include
the plating.
3.4.2 Gold plating. All gold surfaces shall be gold plated to a minimum thickness of 0.00005 inch,
in accordance with ASTM B488, type II, class I, over a 0.00005 inch minimum nickel underplate in
accordance with SAE-AMS-QQ-N-290, class I.
3.4.3 Screw threads. Except for non-replaceable, structural parts, screw threads shall be in
accordance with FED-STD-H28 and shall be NEF-2 fit after plating.
3.4.4
Contacts. The terminal ends of the contacts shall be hot tin-dipped or gold plated to
facilitate soldering.
3.4.4.1 Male (pin) contacts. Male contacts shall be fabricated of half-hard brass material
specified in 3.3.1.
3.4.4.2 Female contacts. The female center and outer contacts shall be fabricated of
beryllium copper material as specified in 3.3.2.
3.5 Coupling sleeve rotation. The torque required to effect rotation of the coupling sleeve
relative to the connector body shall be not greater than 0.75 inch-pound, when tested as specified in
4.7.6.
3.6 Cable retention. The cable properly attached to the connector shall withstand a minimum
pull force of 45 pounds without breaking or movement from the initial fixed position, when tested as
specified in 4.7.7.
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