The various classes and types of connectors are intended for application as follows:

a. MIL-DTL-28840/10 - are receptacles intended for wall or bulkhead flange mounting and are for use with conduit, backshells or cable clamps.

b. MIL-DTL-28840/11 - are receptacles intended for use at the end of a cable where mounting provisions are not required.

c. MIL-DTL-28840/12 - are receptacles intended for mounting on shielding boxes and equipment cases. They have no fittings and are for use with open wiring. Individual wires should not exceed 12 inches in length. Box mount connectors should be used only in controlled atmosphere applications where environmental sealing is not required.

d. MIL-DTL-28840/14 - are receptacles intended for wall or bulkhead jam nut mounting and for use with conduit or a cable clamp.

e. MIL-DTL-28840/16 - are plugs intended for use at the end of a cable to be mated with a receptacle.

f. MIL-DTL-28840/18 - are 90° plugs intended for use at the end of a cable where space does not permit the use of a straight plug.

g. Connectors are intended for use with jacketed cables where the connectors will be subjected to high-impact shock conditions beyond the capabilities of the other class connectors. These connectors have crimp contacts which are removed from the front of the connector and a wire sealing range capable of sealing on Naval shipboard cable. These connectors also have a specified shell conductivity.

h. These connectors are intended for use where the connector will be subject to heavy condensation and rapid changes in temperature or pressure, and where the connector is subject to high vibratory conditions. A MIL-DTL-28840/12 type receptacle does not provide moisture or vibration protection at its back end, and a MIL-DTL-28840/10 type or MIL-DTL-28840/11 type receptacle should be used if such protection is desired.

Wire sizes to be used with contacts. Satisfactory performance of connectors will be obtained if wire sizes are governed in table III. For wire diameters less than specified in table III, shrink-fit sleeving should be used over the wire. Where two or more wires are used in a wire barrel, moisture sealing is not obtainable. 

Restrictions on use of cadmium finishes. Some military departments have restricted the use of cadmium for new design. Restrictions, if applicable, are included in the associated specification sheets (see 3.1).