MIL-DTL-22992G
3.3.9 Fungus-resistant. Materials used in the construction of these connectors shall be fungus inert
(see 4.2.2).
3.3.10 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 6.10).
3.3.11 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 costs.
3.4 Design and construction. Connectors, adapters, protective covers and stowage receptacles shall
be designed and constructed as specified (see 3.1).
3.4.1 Contact design. Contact design shall be such that neither the pins nor the sockets installed in
the connector will be damaged by any possible twisting or forcing during the process of mating.
3.4.1.1 Pin engaging end (classes C, J, and R). The entering end of pins shall be formed with a
spherical radius approximately one-half the diameter of the pin, allowing for a flat in the center of the
spherical development. The diameter of the blunt end shall be in accordance with dimension K as shown
in figure 1. Position of pin engaging end shall be in accordance with dimension H as shown on figure 1.
3.4.1.2 Socket engaging end. The entering end of the socket contact shall be rounded or chamfered
to allow for directing and centering of the entering pin. The socket contact shall provide the spring action
for maintaining the contacting pressure between the pin and socket.
3.4.1.2.1 Classes C, J and R. Size 12 and smaller socket contacts shall be designed to exclude
the entrance of a pin .005 inch ( 0.127 mm) larger than the allowable maximum diameter of a mating pin.
The point of spring engagement of the socket contact with a nominal diameter mating square ended test
pin shall not exceed the values shown in column J, (see figure 1) when measured from the end of the
shell.
3.4.1.2.2 Class L. The point of spring engagement of the socket contact with a nominal diameter
mating square ended test pin shall not exceed the values shown on the applicable defense standard (see
3.1), when measured from the end of the shell.
3.4.1.3 Solder cups (classes C, J, and R). The location of the solder cup shall be such that normal
soldering operations shall not impair any part of the assembly. The solder cup shall be as indicated in
figure 1 and the applicable specification sheet (see 3.1). All solder cavities shall be designed so that
liquid solder will not escape during normal soldering operations and interfere with the float of the contact,
and constructed so liquid solder in the solder cup cannot leak through to the front of the socket and
prevent insertion of the pin.
3.4.1.4 Dimensions. Contact dimensions of class C, J, and R shall be as specified on figure 1.
Contact dimensions of class L shall conform to SAE-AS39029/48 or SAE-AS39029/49. The illustrations
on figure 1 are for dimensional purposes only and are not intended to indicate design.
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