30. CLASS L CONNECTORS.
36. MASTER KEY POSITION. This segment of the part
number identifies the position of the master key for
31. DESIGN APPLICATION. These connectors are a
Class L type connectors. The master key is the largest
special design for power distribution. They are
key in the connector. The measurement of the position
designed for use where they will be subjected to severe
of the master key is relative to the position of the first
impacts or to extreme field service use. Class L
guide key clockwise for a receptacle, or the first guide
connectors are intended for power connections in the
key counter-clockwise for a plug. See Figure 18. Locate
current range from 40 to 200 amperes; they are required
the zero reference of the desired connector. Measure
and are to be used only with heavy-duty jacketed
the position of the master key, in degrees, using a
cables specified on the applicable insert standard. They
protractor. Measure clockwise for plugs and counter-
are arc quenching, if inadvertently separated under full
load. They are waterproof when mated or unmated,
identifying the measured degrees for this segment of
capped or uncapped. They are designed to meet all
the part number.
OSHA and National Electric Code requirements for
37. INSERT CONFIGURATION. The insert
configuration is the manner in which contacts are
32. PART NUMBER DEFINITION. The following
placed within the insert in a standard configuration.
paragraphs contain information necessary for proper
For Class L, use Table 4 to identify the insert
selection and procurement of MIL-DTL-22992, Class L
configuration arrangements. Read down the table to
connectors. The part number breakdown is shown in
the appropriate shell size. Reading from left to right,
Figure 14, and described below. The government
find the total number of contacts in the connector and
certification mark "JAN" or "J" must also be included
the size of each. Use a caliper to measure the contact
in the part number.
size. Match the size in the chart below. Continue
reading across the table to find the insert configuration
33. MILITARY DESIGNATION/SHELL STYLE. To
segment. If the total number of contacts within a given
determine the shell style, see Table 1. Determine the
shell size is the same and the size of those contacts is
connector type (receptacle or plug), and the connector
the same, an illustration is provided to identify the
configuration (wall mount, in-line, etc.). The shell
correct configuration (see Figure 12).
styles, by class, are in the third and fourth columns.
34. FINISH. The second segment of the part number is
the finish designation for Classes L type connectors.
The socket inside diameter will be from 0.002
For Class L, this segment of the part number is the
to 0.005 inch larger than the pin outside
finish. The conductive (C) finish is cadmium-plate over
diameter. The larger the contact, the larger the
nickel-plate. The finish is olive drab, light to dark in
color. The non-conductive (N) finish is a hard oxide
coating. The finish is grey to black in color. Use N or C
38. CONTACT STYLE. Use (P) for pins and (S) for
as applicable for this segment of the part number.
sockets for this segment of the part number.
35. SHELL SIZE. Use Figures 15, 16 and 17 to find the
39. ALTERNATE POSITION. See Figure 19 for Class
shell size. To identify the shell size, use a dial caliper
L alternate positions. For Class L, the master key
to measure the mating thread (M Thread) of the desired
position and the degree of insert rotation are
connector. The measurements for the accessory thread
independently variable. Use the Normal position of
(A Thread); the length of the connector; or the outside
the master key as the zero degree reference. Using a
diameter (OD) of the connector may be necessary if
protractor, measure the number of degrees of insert
one measurement does not conclusively identify a shell
rotation within the shell. Pin inserts rotate
size. Match the measured dimension(s) to the
counterclockwise and socket inserts rotate clockwise.
dimensions in the figure matrix. The shell size is in
Zero degrees of rotation, or the Normal insert position
the left-hand column.
has the letters on the face of the connector level relative
to the master key normal position. This segment is left
blank if there is no rotation.