MIL-DTL-26500G
3.3.1 Finish. Aluminum parts other than class G connectors shall be anodic coated and sealed in
accordance with MIL-A-8625 to meet the performance requirements herein. The resulting finish shall be
dark gray to black in color. The finish of hermetic receptacles shall be suitable for soldering or brazing to
the mounting surface. The finish on class G connectors shall be such as to provide an electrically
conductive path from the cable clamp screws on the plug to the receptacle mounting flange and shall
meet the other requirements herein. Classes E and K stainless steel, shall be passivated in accordance
with ASTM-A967.
3.3.2 Dissimilar metals and compatible couples. When dissimilar metals are used in intimate contact
with each other, protection against galvanic corrosion shall be provided. The use of dissimilar metals in
contact, which tend toward active galvanic corrosion (particularly brass, copper, or steel used in contact
with aluminum or an aluminum alloy) is not acceptable. However, metal plating of dissimilar base metals
to provide similar or suitable abutting surfaces is permitted. The use of dissimilar metals separated by a
suitable insulating material is also permitted. Dissimilar metals and compatible couples are specified in
MIL-STD-889.
3.3.3 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and
externally. Tin content of connectors, their components and solder shall not exceed 97 percent, by mass.
Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.8).
3.4 Design, construction, and physical dimensions. Connectors shall be of the design, construction,
and physical dimensions specified (see 3.1). Connectors shall be so designed that neither the pins nor
the sockets will be damaged during normal mating of counterpart connectors. Each complete plug or
receptacle is an assembly of specific parts, such as:
a.
Body, comprising the shell, dielectric inserts, and on plugs, the coupling ring.
b.
Contacts, pin or socket type as specified.
c.
Plug end seal (except on hermetically sealed receptacles).
d.
Cap, protective plastic.
e.
Instruction sheet (except for class H).
3.4.1 Body. The design and construction of the body portion of the plug and receptacle shall be as
follows:
3.4.1.1 Shell.
3.4.1.1.1 Shell material. The shell for the plug or receptacle for classes R, F, and G shall be
aluminum alloy in accordance with SAE-AMS-QQ-A-367, SAE-AMS-QQ-A-200, or ASTM-B211. Other
materials for classes R, F, and G will be permitted provided they show equal or better mechanical
strength and meet the performance requirements herein. Shell material for class E shall be 300 series
stainless steel. All materials shall be corrosion resistant or protected to meet the performance
requirements herein. The shell material for the hermetic receptacles shall be suitable for soldering or
brazing to a mounting surface of steel or aluminum alloy.
3.4.1.1.2 Shell keying. The polarizing of the mating plug and receptacles shall be accomplished by
integral keys and keyways on plug and receptacle shells in accordance with MIL-STD-1554. Keys shall
be designed to prevent engagement of the contacts with the mating contacts or with the insert surface of
the counterpart connector until the keyways are properly aligned for engagement.
3.4.1.1.3 Mating connectors. The shells and their resilient inserts shall be designed to achieve a face-
to-face resilient seal, in accordance with MIL-STD-1554. Figure 1 shows typical mating characteristics for
type T connectors. The seals thus provided shall be sufficient to allow engaged connectors to comply
with the performance requirements specified herein. Complete mating of threaded types shall occur
when the plug shell bottoms against the receptacle shell.
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