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Dimensions shown in inches (mm)
Specifications and dimensions subject to change
Cannon KJL/KJ/KJA/KJB
MIL-DTL-38999 Series I, II, III Connectors
MIL-DTL-38999 Specifications
A
fter preloading to 3 pounds maximum, the force shall be applied at a rate of approximately 1 pound per second and maintained at full load for 5-10 sec-
o
nds. No damage to contacts or insert shall result nor shall the contacts be dislocated from their normal position in the connector more than 0.012 inch
under the given load. Failure to meet these requirements shall be cause for rejection.
The following excerpts are some of the parameter requirements of the MIL-DTL-3899 Specification.
F
or qualification testing, mating halves shall be coupled and uncoupled, measuring the torques necessary.The torques required to couple and uncouple
mating connector halves shall fall within the limits specifications as follows:
C
onnector halves shall be mated and unmated 250 times for Series II with ground fingers and 500 times for Series I and III at a rate not exceeding 300 cycles
p
er hour. The test may be performed by hand or by mechanical means, but the coupling ring shall be operated as in normal service. Failure to complete this
t
est because of mechanical malfunction shall be cause for rejection.
A
n insulation resistance test shall be performed on unmated connectors in accordance with MIL-STD-202, Method 302, Test condition B. Measurement shall
b
e made between three pairs of adjacent contacts and the shell. Failure to meet the minimum requirement of 50,000 megohms for Classes E, P, F, R, and T
shall be cause for rejection.
W
ired, mated connectors shall be subjected to the vibration test of MIL-STD-202, Method 214, Test Condition II, except that the duration shall be one hour
in each plane. Receptacles shall be mounted on the vibration fixture by normal means. All contacts shall be wired in a series circuit and 100-500 millamperes
of current shall be allowed to flow through the series circuit during vibration. Suitable means shall be employed to monitor the current flow and to indicate
any discontinuity of more than 1 microsecond. The wire bundle shall be damped to the nonvibrating points at least 8 inches from the rear of the connector.
C
urrent discontinuity of 1 microsecond or more, disengagement of the mated connectors, evidence of cracking, breaking, or loosening of parts shall be
cause for rejection.
W
ired mated connectors shall be subjected to one shock in each direction in each of three mutually perpendicular axes. The pulse shall be approximate half
sine wave of 300g ± 15% magnitude with a duration of 3 ± 1 milliseconds. Receptacles shall be mounted on a shock fixture by normal means. All contacts
shall be wired in a series circuit and 100-150 ma. of current shall flow through the series circuit during shock. Suitable means shall be employed to monitor
t
he current flow and to indicate any discontinuity of more than 1 microsecond. The wire bundle shall be clamped to fixed points at feast 8 inches from the
rear of the connector, Current discontinuity of 1 microsecond or more, disengagement of the mated connectors, evidence of cracking, breaking, or loosen-
ing of parts shall be cause for rejection.
Mated connectors shall be placed in a container of water at approximately 20ºC and placed in an altitude chamber. All wire ends shall be located within the
chamber and exposed to the chamber atmosphere, but not submerged. The exposed wire ends shall not be sealed. A quantity of salt, 5 percent by weight,
shall be added to make the water conductive. The chamber pressure shall then be reduced to approximately one inch of mercury and maintained for thirty
minutes. The chamber pressure shall then be slowly returned to atmospheric. This shall be considered one cycle. Two additional cycles shall be performed.
At the end of the last cycle, while the mated connectors are still submerged, the Insulation Resistance Test (room temperature), and the High Potential Test
(sea level voltages) shall be performed upon the same circuits. Failure to meet an insulation resistance minimum of 2,000 megohms or any evidence of dielec-
tric breakdown or -flashover shall be cause for rejection.
Unmated connectors shall be immersed fully in the applicable fluid specified below for 20 hours. After removal from the fluid, each connector shall
remain for one hour in free air at room temperature.
a.) Jet fuel JP-4 to MIL-J-5624 b.) Aircraft lubricating oil to MIL-L-9236
Unmated connectors and individual contact samples shall be subjected to the soft spray of MIL-STD-202, Method 101, Test Condition 8 (tin plated, Class Y
receptacles-24 hours). Immediately after exposure, the surfaces of the specimens shall be thoroughly washed in tap water and dried in a circulatory oven at
a temperature of 38 ±3ºC (100ºF) for a period of approximately 12 hours. Any exposure of basis metal as a result of this test, shall be cause for rejection.
(Series I and 11, finish B; Series III, class W). The wired assembled plugs and receptacles shall be mated and unmated 50 cycles at a rate of 300 cycles per
hour maximum. The mating and unmating shall be accomplished so that the plug and receptacle are completely separated during each cycle. The connec-
tors shall then be subjected to the salt spray test in accordance with method 1001 of MIL-STD- 1344. The connectors shall be tested for 452 hours mated
followed by 48 hours unmated. After the salt spray exposure the remaining number of durability cycles specified in 4.7.7 shall be completed.
Unmated receptacles shall be subjected to 10 cycles of thermal shock in the following manner:
The receptacle shall be suspended for 10 + 1 - 0 minutes in the center of a cold water both with a volume of approximately one cubic foot. No
d
imension of the bath shall be less than 10 inches. The water temperature shall not exceed 4ºC (39.20ºF)
The receptacle shall be suspended for 10 1 - 0 minutes in the center of a hot water bath with a volume of approximately one cubic foot. No
dimension of the bath shall be less than 10 inches. The water temperature shall be not less than 94ºC (201ºF).
The time of transfer from one bath to the other shall not exceed 5 seconds. At the end of the tenth cycle, the receptacle shall have the excess moisture shak-
en off and shall then be dried in a forced air oven at 66±5˚C for 15 ±1 minutes. Any evidence of damage resulting from this test shall be cause for rejection.
Contact Retention 4 5 19
Test
Description
Paragraph
Reference
R
equirements
C
oupling Torque 4 5 6
Durability 4 5 7
Insulation Resistance 4 5 9
Vibration 4 5 22
Shock 4 5 23
Thermal Shock 4 5 4
Altitude Immersion 4 5 8
Solvent Immersion 4 5 29
Corrosion 4 5 12
Dynamic Salt Spray 4 5 12 2
Temperature Durability 4 5 33
Step a
Step b
C
ontact Size 22M* 22D 22* 20 18
L
oads in Pounds ± 10% 10 10 10 15 25
T
orque
Shell Size Max. Min.
8
/9 82
1
0/11 12 2
1
2 16 2
1
3 16 2
Torque
S
hell Size Max. Min.
14 20 4
15 20 3
16 24 4
17 24 3
Torque
S
hell Size Max. Min.
18 28 5
19 28 3
20 32 6
21 32 5
Torque
S
hell Size Max. Min.
22 36 7
23 36 5
24 36 7
25 40 5
Wired rated connectors shall be subjected to the indicated anbient temperature for a period of 1,000 hours
Series I and II (finish A) 150 (302º F) Series I and II (finish B) 175 (347º F)
Series III (class W) 175 (347º F) All other finishes 200 (392º F)
+3º
-0ºC
+3º
-0ºC
+3º
-0ºC
+3º
-0ºC
* For reference only
