MIL-DTL-21617B
3.3.4 Dissimilar metals. When dissimilar metals 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). For guidance, reference MIL-STD-889. Where dissimilar
metals are used in intimate contact with each other, protection against electrolysis and corrosion shall be
provided. Dissimilar metals such as brass, copper or steel (except corrosion-resisting steel), shall be
passivated in accordance with SAE-AMS2700 (see 3.3.1) and shall not be used in intimate contact with
aluminum or aluminum alloy.
3.3.5. Pure tin. The use of pure tin is prohibited. Tin content used in connector materials shall not
exceed 97 percent, and an alloy material shall be chosen to inhibit the growth of tin whiskers (see 6.3).
3.3.6 Nonmagnetic materials. All parts shall be made from materials considered to be nonmagnetic.
3.3.7 Shell die castings. Shell die castings and workmanship shall be aluminum in accordance with
ASTM B85/B85M alloys A13800, A03840, or A14130.
3.3.8 Insert materials.
3.3.8.1 Rigid insert material. Rigid insert materials shall be mineral filled type conforming to Melamine
type MME, Dially Orho-Phthalatic type MDG or Diallyl Iso-Phalatec type MIG in accordance with
ASTM D5948.
3.3.8.2 Resilient materials. Resilient materials shall be in accordance with ASTM D2000,
M2BC 710 A24B24E034 and shall be molded of a high grade resilient dielectric or elastomer having a
shore hardness not greater than 85 and shall conform to the additional requirements specified herein.
3.4 Electrical characteristics. Connectors shall have the electrical characteristics shown on table I.
TABLE I. Nominal current rating.
Contact size
Amperes
20
7.5
16
13.0
12
23.0
8
46.0
4
80.0
3.5 Design and construction. Connectors shall be of the design, construction, and physical dimensions
specified herein and in accordance with the applicable specification sheets (see 3.1). Bosses and barriers
shall be used as necessary to meet leakage requirements.
3.5.1 Insert design. Inserts shall be designed and constructed with proper sections and radii in order
that they will not crack, chip, or break in assembly or in normal service. Structural weakness shall not be
caused by depressions used to achieve longer creepage paths.
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