Features and Application
MIL-DTL-38999 Series II connectors feature a bayonet
coupling mechanism with lower profile design and
rear-removable crimp contact retention system.
These connectors were designed for military and commercial
applications where the prime requirements are lower profile
and lighter weight.
Reduction of both size and weight were achieved through
the use of thinner shell walls and length restrictions. These
design restrictions reduced the RFI attenuation characteristics
and the “scoop” protection, while yielding an excellent general
purpose, lightweight connector. Compared to Series I,
Series II connectors achieve up to 20% reduction in mated
pair length, up to 39% reduction in outside diameter and
up to 40% reduction in weight (128 pin mated pair).
This family of connectors is offered in six receptacle-mounting
styles. They include square flange receptacles, for both front
and rear panel (wall) mounting; square flange receptacles,
for both front and rear panel (box) mounting; square flange
receptacle with extended grommet, for front of panel (box)
mounting; and jam nut receptacles which incorporate
“O” ring seals, designed for rear panel “D” hole mounting.
Plugs are available in two designs, with and without RFI
grounding.
Fifty-two insert arrangement per MIL-STD-1560 are tooled
and qualified to MIL-DTL-38999 Series II, utilizing 3 to 128
M39029 contacts. Contacts come in sizes 22D, 22M, 22, 20,
16 and 12, terminating wire sizes from 28 to 12 gauge.
These connectors are available in wide range of shell materials
and finishes. Aluminum shells are offered in electroless
nickel, bright cadmium, anodized, and olive drab cadmium.
Other finishes such as zinc cobalt are available upon request
to commercial callouts only. In addition, we offer passivated
stainless steel shells with standard environment-resisting
inserts (commercial callouts only).
Universal I/R Tool – A single, expendable plastic tool is used
for both insertion and removal of contacts.
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Closed-Entry Socket Insert – Hard dielectric socket face
has lead-in chamfers for positive alignment of pins (even
partially bent within pre-established limits) with sockets.
Interfacial Pin Insert Seal – Raised moisture barriers
around each pin, which mate into lead-in chamfers of hard
face socket insert, provide individual contact sealing.
Interfacial seal is never touched by service tools.
Elastomer Wire Sealing Grommet – Sealing over a wide
range of wire diameters is assured by a triple wire seal in
each cavity at the rear of the connector.
Superior Contact Stability – Rear release crimp contact
system features a stamped beryllium-copper retaining clip
captivated by molded-in shoulders of each contact cavity in
the insulator. A rear-inserted M81969 plastic tool expands
the tines beyond the shoulder, releasing the contact.
Shell Polarization – Alternate key/keyway positions prevent
cross mating of adjacent connectors having same insert
arrangement.
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