MIL-DTL-22992G
3.3.5 Contacts. Contact basis material (except thermocouple contacts) shall be made of a suitable
conductive copper alloy. Accessory members of the socket contact may be made of a suitable corrosion
resistant material. Thermocouple contacts shall be made of suitable thermocouple combinations as
required.
3.3.6 Grommets and seals. Grommets and seals shall be made of materials conforming to the
applicable requirements of ASTM D2000 and as specified (see 3.1).
3.3.7 Finish.
3.3.7.1 Connectors and accessories. Connectors, cable sealing adapters, protective covers and
stowage receptacles shall be finished with an electrically conductive or electrically nonconductive finish
as specified (see 3.1).
3.3.7.1.1 Conductive finishes, (classes C, J, R, and also class L, ac only). The conductive finish on
shells and accessory hardware shall be in accordance with the following designations:
C
-
The conductive finish shall be nickel plated in accordance with MIL-DTL-38999 Appendix A
or SAE-AMS-C-26074 to a thickness of 0.0002 inch (.0051 mm) minimum, followed by
cadmium plate in accordance with type II of SAE-AMS-QQ-P-416 to a thickness of 0.0001
inch (.00254 mm) minimum. The resulting finish shall be olive drab (light to dark) in color
and shall be electrically conductive. Components of corrosion resistant materials need not
be plated.
P
-
Pure dense electrodeposited aluminum in accordance with MIL-DTL-83488, Type II. Color
shall be nonreflective and electrically conductive.
T
-
Nickel with fluorocarbon polymer additives over a suitable underplate. Color shall be
nonreflective and electrically conductive.
Z
-
Zinc nickel in accordance with ASTM B841 over a suitable underplate. Color shall be
nonreflective and electrically conductive.
3.3.7.1.2 Nonconductive finish (code designation N) (classes C, J, R, and also class L, 28 Vdc only).
The nonconductive finish shall be a hard, oxide coating conforming to finish E-516 of MIL-DTL-14072.
The resulting finish shall be from gray to black in color and shall be electrically nonconductive. Thickness
of the coating shall be approximately 0.001 inch (.0254 mm). Components of corrosion resistant
materials need not be coated.
3.3.8 Contact plating.
3.3.8.1 Copper alloy contacts, classes C, J, and R. All contacts shall be silver plated to a thickness
of .0002 inch (.0051 mm) minimum in accordance with ASTM B700. Size 8 and larger contacts are to be
nickel underplated .00005 inch (.00127 mm) minimum in accordance with Appendix A of MIL-DTL-38999.
3.3.8.2 Thermocouple contact. Thermocouple contacts, except alumel and chromel, shall be
cadmium plated in accordance with SAE-AMS-QQ-P-416 or otherwise suitably protected from corrosion.
Accessory members of the socket contacts (spring members, etc), as applicable, shall be of corrosion
resistant material or suitably protected from corrosion.
3.3.8.3 Class L. Plating of contacts for class L connectors shall be in accordance with
SAE-AS39029.
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