55. MIL-DTL-38999 SERIES II.
operating temperature range.
56. Series II connectors are circular, non scoop proof
environment resistant connectors with bayonet
63. Insert Arrangement. The insert arrangement is
coupling. These connectors are of a low silhouette
shown as a number denoting the number of contacts
design for minimum size and weight with high
density. Series II connectors are for general application
within weapon systems which are not subjected to high
64. Contact Style. The contact style denotes the type
vibration or SWAMP areas.
of contact used.
57. CONSIDERATIONS. Series II connectors are not
suited to all applications and require special handling
in some instances. The following considerations in
application should be followed:
66. DESIGN AND CONSTRUCTION. The connectors
a. Series II connectors are vulnerable to pin
and accessories are designed and constructed to
contact bending from scooping, with size 22, the
withstand normal handling during maintenance and
smallest contact being the most vulnerable.
b. Use in areas of blind mating should be
67. INSERTS. The entire insert of the environment
resisting assemblies is essentially one integral part
designed to provide suitable sealing and support
Locations should minimize the amount of
around the wires and to be non-removable.
cable bending; large cables which must be bent at right
68. Rigid Dielectric. The rigid dielectric is one molded
angles must have the bend permanently established.
piece or not more than two pieces bonded together.
d. Heavy jacketed cable and excessive overhang
The design is such that contacts are able to be inserted
should not be used because of possible damage.
and removed to facilitate installation and maintenance
except hermetic receptacles.
Use in areas of rough handling experienced
near engine removal, generators, support equipment,
69. Contact Locking Device. The contact locking
portable equipment, etc., should be avoided.
devices are contained in the rigid dielectric and
securely hold the contacts during normal coupling.
During engagement, care must be exercised to
ensure all bayonet pins are engaged by the coupling
70. Rotation. The inserts are secured in a manner so as
ring; it is possible to only engage one bayonet pin and
to prevent rotation or movement.
therefore only partially couple.
71. Interface Seal. All pin contact inserts will have a
g. When mating in areas of difficult visibility,
resilient interface seal bonded to the front face to
care must be exercised to ensure that connector plugs
prevent water intrusion.
resulting in contacts touching.
72. Hermetic Receptacles. A vitreous or glasslike
material issued, to insulate and seal the contacts, and
58. PART NUMBER. The part number contains the
all pin contacts will have an interface seal. The contacts
information necessary for the proper selection and
are not removable.
procurement (Figure 12).
73. INSERT ARRANGEMENTS. The insert
59. Military Specification. The military specification
arrangement is the number and size of the contacts
will denote the shell style.
available by shell size (Table 2).
60. Class. The class indicates the environment
74. INSERT CONFIGURATION. The insert
configuration is the manner in which the contacts are
placed within the insert in a standard configuration.
61. Shell Size. The shell size is indicated by a
All arrangements identified in Table 2 are illustrated
progressive number system.