MIL-DTL-21617B
3.5.6 Contact identification. Contact positions shall be designated as specified in the individual
specification sheets. Letters or numerals shall be clearly legible and shall be either raised or depressed.
Letters or numerals shall be arranged to avoid confusion between contacts. All letters shall appear on the
front of each insert and, as many as practical, on the rear face. Lettering of the socket insert shall
correspond with that of the mating pin insert.
3.5.7 Contact arrangement. Contacts shall be arranged in accordance with the individual specification
sheet requirements.
3.5.8 Contact design. Contacts shall be so designed that mating or unmating the connectors will not
damage them.
3.5.8.1 Pin engaging end. The entering ends of pins, sizes 8, 12, and 16, shall be formed with a
spherical radius approximately one-half the diameter of the pin, allowing for a flat not in excess of 0.015
inch (0.38 mm) diameter in the center of the spherical development. The entering end of size 20 pin shall
be either formed with a spherical or a conical tip. The tip of the spherical end of the size 4 pin shall be cut
off to form a blunt end such that the diameter of the blunt end shall be .125 inch (3.18 mm) less than the
pin diameter.
3.5.8.2 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 contact pressure between the pin and socket. Size 16 socket contact shall be of the
closed entry design to exclude the entrance of a pin .005 inch (0.13 mm) larger than the allowable
maximum diameter of a mating pin. Socket contact size 20 shall be either closed or open entry design.
Closed entry socket contacts size 16 shall pass the resistance to test prod damage test specified in
3.5.9 Polarization. Polarization of the plug, with its receptacle, shall be accomplished by the shells.
The polarization of the plug with its receptacle shall be accomplished before engagement of contact pins
in their respective sockets.
3.5.10 Mating. Plugs and receptacles shall be capable of being mated and unmated by hand without
the aid of any tools within the operating temperature range for these connectors (see 3.5.13).
3.5.11 Connector shell design. Connector shell design shall be either solid or split shell design.
3.5.12 Connector shells. Connector shells, both plug and receptacle shall be provided with a means of
accommodating back shells for straight and 90° angle exit of the cable from the connector assembly.
Back shells, both straight and right angle, are accessories and are not supplied as a part of the connector
assembly.
3.5.13 Operating temperature. Connectors shall have maximum operating temperature of +125°C and
a minimum operating temperature of -55°C.
3.6 Performance.
3.6.1 Insulation resistance. When tested as specified in 4.5.2, the initial insulation resistance shall be
not less than 5,000 megohms. After being subjected to the moisture resistance test specified in 4.5.13,
the insulation resistance shall be not less than 1 megohm.
3.6.2 Withstanding voltage. When tested as specified in 4.5.3, connectors shall be capable of
withstanding the applicable test voltages shown in table III without flashover.
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