MIL-DTL-28748D
3.3.1 Reference materials, plating, and processes. The identified reference material, plating, and processes have been
established to provide assurances that connectors manufactured to this specification will properly interface to similar industry
standard or government specified connector systems without problems of electrochemical contamination of critical electrical or
mechanical interfaces or generation of incompatible mechanical interface surface wear products. The manufacturer of connectors
supplied to this specification are allowed to use alternate recognized industry standard materials, plating, and processes from those
identified in paragraph 3.3 of this specification. Alternate materials, plating and processes used must be coordinated with the
qualifying activity as part of the qualification process. Use of alternates to those referenced guidance items by the supplier must not
result in inferior short or long term performance or reliability of supplied connectors as compared with connectors manufactured using
the referenced materials, plating, or processes. Short or long term failures or reliability problems due to use of these alternates shall
be the responsibility of the supplier.
3.3.2 Nonmagnetic materials. All parts shall be made from materials which are classified as nonmagnetic.
3.3.3 Metals and finishes. All exposed metal parts, other than electrical contacts, shall be manufactured with a corrosion-resistant
material or finished to resist corrosion. Noncorrosion-resisting metal parts shall be cadmium plated in accordance with QQ-P-4 16,
type II, class 1 or class 2, or zinc plated in accordance with ASTM B633, type II, SC 3 or SC 4, except that a preliminary plating of
other metal is permissible. Aluminum alloy parts shall be anodized in accordance with MIL-A-8625, type I or II. Corrosion resistance
steel parts shall be passivated in accordance with AMS-QQ-P-35. Unless otherwise specified (see 3.3.1), all finishes shall be
conductive, except anodized parts.
3.3.3.1 Dissimilar metals. When dissimilar metals (as defined in MIL-STD-889) are used in intimate contact with each other,
protection against electrolysis and corrosion shall be provided. The use of dissimilar metals which, in contact, tend toward active
electrolytic corrosion (particularly brass, copper, or steel used in contact with aluminum and aluminum alloy) is not acceptable
(see 3.3).
3.3.3.2 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 cost.
3.3.4 Insert material. Insert material shall be diallyl phthalate conforming to ASTM D5948, type SDG-F, GDI-30F, GII-30F, or SIG-
F, or thermoplastic polyphenylene sulfide compound conforming to ASTM PS2, type GST-40F (see 3.3.1).
3.3.5 Solder type contacts. Solder type contacts shall of the nonremovable type (see 3.4.2.2). Materials shall be in accordance
with ASTM B36, ASTM B121, ASTM B16, ASTM B122 (C72500), ASTM B139, ASTM B194, ASTM B196, or ASTM B197. Crimp
type contacts shall conform to MIL-C-39029. Manufacturers who are using crimp type contacts which are qualified, do not have to
measure finish thickness specified in 4.7.19.1 and 4.7.19.2, or to perform the industrial gas test specified in 4.7.20.
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