MIL-PRF-39012E
NOTE: No PIN changes will be made as a result of this plating change. The change will be
tracked via the manufacturer's date code.
3.3.1.2 Connector bodies. All brass bodied connectors shall be silver plated in accordance with
ASTM-B700 to a minimum thickness of 0.0002 inch (0.005 mm) over a copper underplate or shall be
nickel plated in accordance with SAE-AMS-QQ-N-290 over a copper underplate, only when specified
on the individual specification sheet. If not specifically noted the plating shall be silver. (Note of
caution! Nickel plated connectors may cause Passive Intermodulation (PIM) problems. The user is
ADVISED to check the application involved when choosing this type of plating.) All copper beryllium
bodied connectors shall be gold plated to a minimum thickness of 50 micro inches (1.27µm) in
accordance with ASTM B488, type II, code C, class 1.27, over a copper flash. All corrosion resistant
steel bodied connectors shall be passivated in accordance with SAE-AMS-2700, unless otherwise
specified (see 3.1). NOTE: Ferrous or nickel alloys shall not be used on brass or copper beryllium
bodied connectors (i.e. coupling nuts, etc.). (Past experience has shown that these plating conditions
allow these connectors to meet the performance requirements of this specification.)
3.3.2 Dissimilar metals. Dissimilar metals between which an electromotive couple may exist shall not
be placed in contact with each other. Reference is made to MIL-STD-889 for definition of dissimilar
metals.
3.3.3 Nonmagnetic materials. All parts (except hermetic sealed connectors) shall be made from
materials which are classed as nonmagnetic (see 3.8).
3.3.4 Spring members. Unless otherwise specified (see 3.1), center contact spring members shall
be made of copper beryllium.
3.3.5 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided that
the material meets or exceeds the operational and maintenance requirements, and promotes
economically advantageous life cycle costs.
3.4 Configuration and features. Connectors shall be of the configuration and physical dimensions
separately optimized in VSWR (see 4.6.11). It is not permitted to compensate for discontinuities of
one connector by the design of the mating connector.
3.4.1 Mating (visual indication). When applicable (see 3.1), a visual means shall be provided to
indicate when two mating connectors are properly mated.
3.4.2 Screw threads. Screw threads shall be in accordance with FED-STD-H28 unless otherwise
specified (see 3.1).
3.4.3 Connector interfaces. Connector interfaces shall be in accordance with MIL-STD-348 unless
otherwise specified (see 3.1).
3.5 Force to engage/disengage.
3.5.1 Bayonet and threaded types. When tested as specified in 4.6.2.1, the torque necessary to
completely couple or uncouple the connectors shall not exceed that specified (see 3.1). Also the
longitudinal force necessary to initiate the engaging or disengaging cycle shall not except that
specified (see 3.1).
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