MIL-DTL-21097G
3.3.7.1.2.3 Nonfunctional areas. Any portion of the contact other than the contact mating area or termination area
shall, as a minimum, have a nickel plating in accordance with SAE-AMS2403 (30 to 150 microinches).
3.3.8 Contact springs. Unless otherwise specified (see 3.1), contact springs shall be made from a suitable copper
alloy material. The contact springs shall be gold-plated in accordance with ASTM B488, type II, class 1.27, code C,
except that silver underplate shall not be used.
3.3.9 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content used in connector materials and solder shall not exceed 97 percent by mass. Tin shall be alloyed with a minimum
of 3 percent lead, by mass (see 6.4).
3.4 Design and construction. Connectors shall be of the design, construction, and physical dimensions specified
(see 3.1). Barriers may be used as necessary to meet leakage requirements. Solderless wrap termination areas shall
be tin lead plated in accordance with SAE-AMS-P-81728, .0001 to .0003 inch thick. The tin lead composition shall be
50 to 95 percent tin.
3.4.1 Body design. Connector bodies shall be designed and constructed with proper sections and radii to preclude
cracking, chipping, or breaking during assembly or in normal service. Depressions used to achieve longer creepage
paths shall not be used so as to cause structural weakness.
3.4.2 Contacts. Contacts shall be as specified (see 3.1). The contacts shall be designed in such a way that they will
not be damaged by mating and unmating in the normal manner, nor shall they damage the printed wiring board to an
extent beyond normal wear. Pin contacts shall also be capable of being crimped with a crimping tool in accordance with
MIL-DTL-22520.
3.4.2.1 Contact spacing. The center to center distance between contacts shall be as specified (see 3.1).
3.4.2.2 Contact arrangements. Contacts shall be arrange in accordance with individual type requirements as
specified (3.1).
3.4.2.3 Contact finish. Contact finish shall be smooth, free of shear lines, tear out or scratches, and shall show no
signs of porosity or surface cracks when examined under 10-power magnification.
3.4.2.4 Contact and terminal identification. All contact and terminal designations shall be permanent and legible and
shall be located on the front and rear faces of the connector body as indicated (see 3.1). Contact positions on the front
face shall be identified by raised numerals. Rear face termination positions shall be identified by either raised numerals
or flush numerals in contrasting color.
3.4.3 Polarization. Polarization of the connector assembly, when required, shall be accomplished by the installation
of a polarizing key in any one or more contact positions, or between contact positions. Contacts shall not be removed
for polarization purposes. Polarization shall be accomplished before engagement of the contacts and shall prevent the
mating of the connector assembly in any manner other than the method intended. Polarizing keys shall have the
dimensions and characteristics as specified (see 3.1).
3.4.4 Mating. Printed wiring board and receptacles shall be capable of mating and unmating by hand without the use
of special tools within the temperature range for these connectors (see 3.5.2).
3.4.5 Insertion and removal tools. Insertion and removal tools shall be as specified (see 3.1).
3.5 Electrical characteristics.
3.5.1 Contact current rating. Unless otherwise specified (see 3.1), the maximum current rating for all type contacts
shall be 5.0 amperes
3.5.2 Operating temperature. Connectors shall be capable of continuous operation within a temperature range of
-
65°C to+125°C.
3.6 Permeability. When connectors are tested as specified in 4.6.2, the permeability shall be less than 2.0 µ.
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