MIL-PRF-31031B
3.3.2 Dissimilar metals. Dissimilar metals between which an electromotive couple may exist shall not
be placed in contact with each other (in accordance with MIL-STD-889).
3.3.3 Spring members. Unless otherwise specified (see 3.1), all contact spring members shall be
made of copper beryllium.
3.3.4 Fungus resistance. The item shall be inherently fungus-inert.
3.3.5 Prohibited materials. Use of the following materials is prohibited unless specifically authorized by
the procuring activity:
a. Hazardous and restrictive substances as can be found on the Defense Standardization Program
Web site, at https://dsp.dla.mil/documents/sd-14.html .
b. Polyvinyl chloride.
c. Beryllium oxide. Not applicable to solid beryllia ceramic forms.
d. Thermally conductive greases.
e. Cadmium.
f. Zinc.
g. Tin (purities 97% or greater).
3.4 Configurations and features. Connectors shall be of the interface and physical dimensions
specified (see 3.1). Each half of a connector pair must be separately optimized in VSWR (voltage
standing wave ratio), (see 4.6.11). It is not permitted to compensate for design deficiencies of one
connector by the design of the mating connector. NOTE: The U.S. Government preferred system of
measurement is the metric SI system. However, since this item was originally designed using inch-pound
units of measurement, in the event of conflict between the metric and inch-pound units, the inch-pound
units shall take precedence.
3.4.1 Mating (visual indication). When applicable (see 3.1), a visual means shall be provided to
indicate when two mating connectors are mated.
3.4.2 Screw threads. Unless otherwise specified (see 3.1), screw threads shall be in accordance with
3.4.3 Connector interfaces. Unless otherwise specified (see 3.1), connector interfaces shall be in
accordance with MIL-STD-348.
3.4.4 Assembly instructions. Complete assembly instructions shall be furnished by the manufacturer
with each connector procured under this specification. It's not the intention of this specification to require
assembly instructions with uncabled connectors (i.e., solder pot, solder tab, or posts, etc.). Assembly
instructions shall include:
a. Cable preparation - stripping dimensions and tolerances.
b. List and description of crimping tools.
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