D38999/49 Defense Supply Center, D38999/49 Datasheet - Page 13

• Manufacturer Part Number: D38999/49
• Description: D38999K / D38999J 500 Cycle Contact
• Manufacturer: Defense Supply Center

the grommets of environment resisting connectors shall be designed to accept sealing plugs/dummy
contacts in accordance with MS27488, MIL-C-85049/80 or MIL-C-85049/81 as applicable, in lieu of wire
where unwired contacts are employed. The quantity of sealing plugs to be enclosed in the unit pack shall
be ten percent of the number of contacts, but not less than one, for each contact size. For indirect
shipments, connectors may be ordered without grommet sealing plugs (see 6.2). The following connectors
are not designated to accept sealing plugs and sealing plugs shall not be provided in the unit packages for
these containers: MS27496, MS27499, MS27505, MS27508, all class P connectors, hermetic connectors,
and thru-bulkhead connectors.
barriers (see figures 13, 14 and 15). The pin barrier projections shall seal in their respective lead-in
chambers of the hard face socket insert. The resilient interfacial seal shall provide individual contact seals
in the mated condition to ensure circuit isolation between each contact and contact to shell. The
receptacles of series I, II, and III shall be provided with a peripheral seal. The plugs of series IV shall
incorporate an O-ring peripheral seal.
designed to retain their inserts in one position, both axially and with respect to rotation, by mechanical
means. Adhesive may be used as a supplementary retention means for environment resisting connectors.
Each plug and receptacle connector shall have at least one blue color band in accordance with EIA-359,
indicating a rear release contact retention system. The blue color band shall be located so that it is readily
visible to any person servicing a mounted connector. Hermetic receptacles do not require a blue color band.
series II and IV plugs noted "EMI grounding" (see 3.1) shall have spring fingers. Spring fingers shall be
designed to make electrical contact with the mating shell without interfering with proper engagement. The
springs shall be retained about the shell periphery. Minimum engagement of spring fingers shall be .040
(1.02 mm) prior to contact engagement for series I, III, and IV, and shall be after contact engagement for
series II. Gold plating shall not be permitted on the spring fingers in connectors with cadmium plated shells.
mounting nut MS3186 for series I and II, and DOD-C-38999/28 for series III and IV, all with provisions for
locking, and an O-ring in accordance with SAE-AS3582.
ISO/R261-1973, ISO/R262-1973, and ISO/R965-1973, as applicable. Threads shall be checked using ring
or plug gauges. Slight out-of-roundness beyond the specified tolerances is acceptable if threads can
accept the gauges without forcing.
mechanism for series I and II, a triple start thread mechanism for series III and a breech mechanism for
series IV. The mechanism shall include a means of maintaining the mated connector in full engagement.
The coupling ring shall be knurled or fluted to facilitate coupling and shall be captivated. The coupling nuts
of all connectors shall have a blue color band in accordance with EIA-359, indicating a rear release contact
retention system. Coupling pins of series I and II connectors and accessories shall be permanently
attached. The end surfaces of all coupling pins shall be of contrasting color to the shell finish.
coupled and uncoupled in a normal and accessible location without the use of tools.
3.4.3.2 Grommet sealing plugs. Except for box mount connectors and as otherwise specified (see 3.1),
3.4.3.3 Mating seal. Plugs and receptacles with pin inserts shall have a resilient face with individual pin
3.4.4 Shell. Shells, including mounting flanges, shall be of one-piece construction and shall be
3.4.4.1 Spring fingers except class C or finish C. All series I and III plugs shall have spring fingers. All
3.4.4.2 Jam-nut mounting receptacles. Jam-nut mounting receptacles shall be provided with a
3.4.5 Screw threads. Screw threads shall conform to FED-STD-H28, MIL-S-7742, ISO/R68-1973,
3.4.6 Coupling. Connectors shall be coupled to counterpart connectors by means of a bayonet
3.4.6.1 Ease of coupling. Counterpart connectors of any arrangement shall be capable of being fully
3.4.6.2 Locking.
MIL-DTL-38999K
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