MIL-DTL-16377J(SH)
3.4.5.1 Selection of metals in direct contact. In order to minimize corrosion attack due to electrolytic action
between dissimilar metals in contact with each other, metal-to-metal contacts shall be limited to those metals which,
when coupled, are in accordance with MIL-E-917.
3.4.5.2 Corrosion-resistant. The following commonly used metals when properly applied are considered to be
inherently corrosion-resistant without further processing:
a.
Brass.
b.
Bronze.
c.
Copper.
d.
Copper-nickel alloy.
e.
Copper-beryllium alloy.
f.
Copper-nickel-zinc alloy.
g.
Nickel-copper alloy.
h.
Nickel-copper-silicon alloy.
i.
Nickel-copper-aluminum alloy.
j.
Austenitic steels, AISI Types 202, 302, 303, 304, 304L, 309, 310, 316, 316L, 321, 324A, and 347.
3.4.5.3 Aluminum. Aluminum alloy shall be used insofar as practicable. Aluminum alloys, except castings,
shall conform to ASTM standards. Aluminum alloy casting shall be manufacturer s choice, except sand castings
and permanent mold castings shall conform to Class 2B of SAE-AMS2175. Grade shall be manufacturer s choice.
3.4.5.4 Nonferrous material. Nonferrous materials, except aluminum, shall conform to commercial standards.
3.4.6 Plastics. Plastic materials shall conform to the requirements of MIL-E-917, 3.4.2.1, and as specified
herein.
3.4.6.1 Uniformity. Plastic materials shall be free of defects such as blemishes, embedded particles, bubbles,
scratches, and striations.
3.4.6.2 Mechanical parts. Whenever plastic materials are contemplated for mechanical applications as
replacements or substitutes for metal parts, they shall meet the flammability characteristics specified in 3.4.2.1.
3.4.6.3 Thermoplastic materials. Plastics that melt or soften under test conditions imposed by the applicable
specification sheet shall not be used.
3.4.6.4 Electrical insulating parts. Plastics used for electrical insulating parts shall be of the type specified
herein.
3.4.6.4.1 Plastics, laminated. Laminated plastic material shall be a glass cloth bonded with melamine resin, in
accordance with MIL-I-24768 and MIL-I-24768/1. No other laminated plastic material shall be used for electrical
insulation. All cut surfaces of laminated plastic shall be given two coats of varnish in accordance with
ASTM D3955 to prevent absorption of moisture or a conformal coating shall be used.
3.4.6.4.2 Thermosetting, molded. Thermosetting, molded insulated parts shall conform to Type MAI-60 or
Type MMI-30 of ASTM D5948.
3.4.7 Springs. Material for springs, retaining clips, and retaining rings shall be as specified in the applicable
specification sheet. See Guideline 41 of MIL-HDBK-454 for additional information in regards to common design
and material decisions.
3.4.8 Magnetic permeability. The magnetic permeability of all surfaces of completed fixtures shall be 2.0 or
less after fabrication when tested as specified in 4.8.18. Unless otherwise specified (see 3.1 and 6.2), the magnetic
permeability requirements shall not apply to shock mounts and fastening devices such as rivets and screws.
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