MIL-DTL-38999 Series I, II, III Connectors
Performance and Material Specifications
MATERIALS AND FINISHES
Aluminum
Receptacle
Shell
Aluminum alloy
Insulator
High grade plastic
Contacts
Copper alloy, gold plate
Grommet and Seal Silicone base elastomer
Jam Nut
Aluminum alloy
Grounding Spring
-
*Finish as noted in How To Order sections.
ELECTRICAL DATA
Contact Size: 22D, 22M*, 22*, 20, 16 and 12
Contact Rating and Wire Size Accomodation
Wire
Size
28
26
24
22
20
18
16
14
12
*For reference only
Service Rating
Altitude
Sea Level
50,000 ft.
70,000 ft.
100,000 ft.
Service Rating M
Mated
Unmated
1300
800
800
800
1300
550
350
200
Service Rating N
Mated
Unmated
1000
600
600
600
1000
400
260
200
Service Rating I
Mated
Unmated
1800
1000
1000
1000
1800
600
400
200
Service Rating II
Mated
Unmated
2300
1000
1000
1000
2300
800
500
200
22D
1.5
2.0
3.0
5.0
-
-
-
-
-
22M*
1.5
2.0
3.0
-
-
-
-
-
-
Contact Size and Test Amps
22*
20
-
2.0
3.0
5.0
-
-
-
-
-
-
-
3.0
5.0
7.5
-
-
-
-
16
-
-
-
-
7.5
10.0
13.0
-
-
12
-
-
-
-
-
-
-
17.0
23.0
Grounded Plug
Aluminum alloy*
High grade plastic
Copper alloy, gold plate
Silicone base elastomer
-
Beryllium copper
Composite
Receptacle
Thermoplastic
High grade plastic
Copper alloy, gold plate
Silicone base elastomer
-
-
Grounded Plug
Thermoplastic
High grade plastic
Copper alloy, gold plate
Silicone base elastomer
-
Beryllium copper
Test voltage, AC (rms), work voltage to be determined by application
Test Data
Test Description
Durability
Temperature Range
Vibration
Parameters
500 cycles of mating and unmating, 250 cycles for Series II with spring fingers
Class F, N; - 65ºC (-85ºF) to + 200ºC (+392ºF) Class A; - 65ºC (-85ºF) to + 150ºC (+302ºF)
Class B,W: - 65ºC (-85ºF) to + 175ºC (+347ºF)
Mated connectors are vibrated with weights to simulate rear accessory loads to
the following levels:
Sine Vibration:
Up to 60 G's - Series I & III (at rated temperature - Series III)
Not applicable for Series II.
Random Vibration: 43.7 Grms at rated temperature - Series III
49.5 Grms at Ambient Temperature - Series I & III
43.7 Grms at Ambient Temperature - Series II
Class F: EMI leakage attenuation, greater than 90dB at 100Mhz, greater than 65dB
at 10 GHz. Shell to shell conductivity, 1.0 millivolt max. resistance.
Class W: EMI leakage attenuation, greater than 90dB at 100 MHz, greater than 50dB
at 10 GHz. Shell to shell conductivity, 2.5 millivolt max.
Class B, W, and Z will withstand 500 hours salt spray.
Class A, F, N, will withstand 48 hours salt spray.
Connectors are fluid resistant to many fuels, solvents, coolants and oils.
Mated conectors terminated with MIL-C-915 cable and environmentally sealed
backshells will withstand high impact shock per MIL-S-901. Applicable to Series
I & III only.
Designed to operate between sea level and 100,000 ft. above sea level.
Mated connectors shall withstand sand and dust per method 110 of MIL-STD-202 and
be ice resistant. Applicable to Series I & III only.
Dimensions shown in inches (mm)
Specifications and dimensions subject to change
EMI Shielding
Effectiveness
Corrosion Resistant
Fluid Immersion
High Impact Shock
Altitude
Other Environments
NOTE: For hermetic standard or test data please consult ITT.
4
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MIL-DTL-38999 Series III Composite Connectors
How To Order
Military Nomenclature
CONNECTOR TYPE
SHELL STYLE
SERVICE CLASS
(HARDWARE FINISH)
SHELL SIZE
CONTACT ARRANGEMENT
CONTACT STYLE
POLARIZING POSITION
CONNECTOR TYPE
D38999/ - MIL-DTL-38999 Series III
SHELL STYLE
D38999/20 - Wall mount receptacle
D38999/26 - Straight Plug, Grounded
SERVICE CLASS
(Hardware Finish)
J - Olive drab cadmium over electroless nickel
plate, -85ºF to +347ºF (-65ºC to +175ºC)
M - Electroless nickel - 85ºF to +392ºF
(-65ºC to +200ºC), RoHS Compliant
CONTACT ARRANGEMENT
See pages 22, 23.
CONTACT STYLE
H - Pin conatcts (1500 cycle)
J - Socket contacts (1500 cycle)
P - Pin conatcts
S - Socket contact
A - Less Pin contacts*
B - Less Socket contact*
* Used only when other than power contacts are to
be installed (i,e., shielded, thermocouple, etc.)
POLARIZING POSITION
N (normal), A, B, C, D, E. See page 21.
D
E
F
G
H
J
Military
Designation
Cannon
Designation
Note: To order MS connectors less standard power
contacts, purchase order must state “Less Contacts”.
D38999
20
M
C
35
A
N
SHELL SIZE
A
9
B
C
11 13 15 17 19 21 23 25
Cannon Nomenclature
SERIES PREFIX
SHELL STYLE
CLASS
SHELL SIZE
HARDWARE FINISH
CONTACT ARRANGEMENT
CONTACT STYLE
POLARIZING POSITION
MODIFICATION CODE
SERIES PREFIX
KJB* - Series III - Scoop proof,
threaded coupling
SHELL STYLE
0 - Wall mount receptacle
6 - Straight plug
CLASS
T - Environment-resistant (without
rear accessory)
* Consult factory for availability
CONTACT ARRANGEMENTS
See pages 22 and 23.
SHELL SIZE
9
A
Cannon
11 13 15 17 19 21 23 25 Designation
B
C
D
E
F
G
H
J
Military
Designation
KJB
0
T
13
M
35
P
N
L
CONTACT STYLE
H - Pin conatcts (1500 cycle)
J - Socket contacts (1500 cycle)
P - Pin contacts
S - Socket contacts
POLARIZING POSITION
N (normal) A, B, C, D, E. See page 21.
MODIFICATION CODE
L - Less contacts, not stamped on connector
HARDWARE FINISH
J - Olive drab cadmium over electroless nickel
plate, -85ºF to +347ºF (-65ºC to +175ºC)
M - Electroless nickel, - 85ºF to +392ºF
(-65ºC to +200ºC), RoHS Compliant
Dimensions shown in inches (mm)
Specifications and dimensions subject to change
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19
MIL-DTL-38999 Series III Composite Connectors
Wall Mount Receptacle
D38999/20
KJB0T
S
R
1
R
2
B
THREAD
W
MAX.
V THREAD
Z
M
T
4 PLACES
BLUE BAND
(INDICATES REAR
RELEASE CONTACT
RETENTION SYSTEM)
.230 MAX PANEL
THICKNESS (including mounting hardware)
.520 (13.20) MAX
TT 4 PLACES
RED BAND
(FULLY MATED
INDICTAOR BAND)
Shell
Size
9
11
13
15
17
19
21
23
25
MS
Shell size
Code
A
B
C
D
E
F
G
H
J
B Thread
Class 2A
(Plated)
.6250-0.1P-0.3L-TS
.7500-0.1P-0.3L-TS
.8750-0.1P-0.3L-TS
1.0000-0.1P-0.3L-TS
1.1875-0.1P-0.3L-TS
1.2500-0.1P-0.3L-TS
1.3750-0.1P-0.3L-TS
1.5000-0.1P-0.3L-TS
1.6250-0.1P-0.3L-TS
M
+.000 (.000)
-.005 (.130)
.768 (19.50)
.768 (19.50)
.768 (19.50)
.768 (19.50)
.768 (19.50)
.768 (19.50)
.736 (18.70)
.736 (18.70)
.736 (18.70)
R 1
.719 (18.26)
.812 (20.62)
.906 (23.01)
.969 (24.61)
1.062 (26.97)
1.156 (29.36)
1.250 (31.75)
1.375 (34.92)
1.500 (38.10)
R 2
.594 (15.09)
.719 (18.26)
.812 (20.62)
.906 (23.01)
.969 (24.61)
1.062 (26.97)
1.156 (29.36)
1.250 (31.75)
1.375 (34.92)
T
TT
S
+.004 (.100) +.004 (.100)
+_.012 (.300) -.002 (.050) -.002 (.050)
.938 (23.83)
1.031 (26.19)
1.125 (28.58)
1.219 (30.96)
1.312 (33.32)
1.438 (36.53)
1.562 (39.67)
1.688 (42.88)
1.812 (46.02)
.128 (3.25)
.128 (3.25)
.128 (3.25)
.128 (3.25)
.128 (3.25)
.128 (3.25)
.128 (3.25)
.154 (3.91)
.154 (3.91)
.216 (5.49)
.194 (4.93)
.194 (4.93)
.173 (4.39)
.194 (4.93)
.194 (4.93)
.194 (4.93)
.242 (6.15)
.242 (6.15)
Metric V
Thread
(Plated)
M12X1-6g0.100R
M15X1-6g0.100R
M18X1-6g0.100R
M22X1-6g0.100R
M25X1-6g0.100R
M28X1-6g0.100R
M31X1-6g0.100R
M34X1-6g0.100R
M37X1-6g0.100R
W
Max.
.143 (3.63)
.143 (3.63)
.143 (3.63)
.143 (3.63)
.143 (3.63)
.143 (3.63)
.171 (4.35)
.171 (4.35)
.171 (4.35)
Z
+.005 (.130)
-.010 (.250)
1.255 (32.00)
1.255 (32.00)
1.255 (32.00)
1.255 (32.00)
1.255 (32.00)
1.255 (32.00)
1.255 (32.00)
1.255 (32.00)
1.255 (32.00)
Straight Plug Grounded
D38999/26
KJB6T
L
D THREAD
Q
B
BLUE BAND
(INDICATES REAR
RELEASE CONTACT
RETENTION SYSTEMS
V THREAD
Shell
Size
9
11
13
15
17
19
21
23
25
MS
Shell size
Code
A
B
C
D
E
F
G
H
J
B
+.008 (.200)
-.000 (.000)
.811 (20.6)
.929 (23.6)
1.11 (28.2)
1.23 (31.3)
1.35 (34.5)
1.46 (37.3)
1.59 (40.5)
1.72 (43.7)
1.84 (46.8)
L
Max.
1.24 (31.5)
1.24 (31.5)
1.24 (31.5)
1.24 (31.5)
1.24 (31.5)
1.24 (31.5)
1.24 (31.5)
1.24 (31.5)
1.24 (31.5)
Q
Dia Max.
.858 (21.8)
.984 (25.0)
1.157 (29.4)
1.27 (32.5)
1.40 (35.7)
1.51 (38.5)
1.64 (41.7)
1.76 (44.9)
1.88 (48.0)
Performance Specifications-Pages 3 and 4.
Contacts, Sealing Plugs, Assembly Tools - Pages 24, 31, and 32.
Contact Arrangements - Pages 22 and 23.
Dimensions shown in inches (mm)
Specifications and dimensions subject to change
20
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MIL-DTL-38999 Series I, II, III Connectors
Polarizing Positions
Series I
C
D
N
A
Angle of Rotation (Degrees)
Shell
Size
9
11
13
15
17
19
21
23
25
Normal
95º
95º
95º
95º
95º
95º
95º
95º
95º
A
77º
81º
75º
74º
77º
77º
77º
80º
80º
B
67º
63º
61º
65º
65º
65º
69º
69º
C
123º
127º
129º
125º
125º
125º
121º
121º
D
113º
109º
115º
116º
113º
113º
113º
110º
110º
B
REF
5º
Front face of receptacle (plug opposite). Insert
arrangement does not rotate with main key-keyway.
The master key is rotated to provide shell polar-
ization; the minor keys remain fixed.
Series II
C
D
N
A
Angle of Rotation (Degrees)
D
Shell Size
8
10
12
14
16
18
20
22
24
Normal
100º
100º
100º
100º
100º
100º
100º
100º
100º
A
82º
86º
80º
79º
82º
82º
82º
85º
85º
B
72º
68º
66º
70º
70º
70º
74º
74º
C
128º
132º
134º
130º
130º
130º
126º
126º
118º
114º
120º
121º
118º
118º
118º
115º
115º
B
10º
REF
Front face of receptacle (plug opposite). Insert
arrangement does not rotate with main key-keyway.
The master key is rotated to provide shell polar-
ization; the minor keys remain fixed.
Series III
RECEPTACLE
(Front face shown)
Shell
Size
MAIN
KEYWAY
AR˚
BSC
BR˚
BSC
9
DR˚
BSC
CR˚
BSC
PLUG
(Front face shown)
MAIN
KEY
AP˚
BSC
BP˚
BSC
CP˚
BSC
11
13
and
15
DP˚
BSC
17
and
19
NOTES
1. All Angles are BSC
2. The insert arrangement does not rotate with
main key/keyway
3. All minor keys are rotated to provide shell
polarization, the master key remains fixed at
twelve o’clock position.
4. Polarization is different from
Series I and II.
21
23
and
25
Key &
Keyway
Arrangement
identifi-
cation
Letter
N
A
B
C
D
E
N
A
B
C
D
E
N
A
B
C
D
E
N
A
B
C
D
E
Key Locations
ARº
or
APº
BSC
105
102
80
35
64
91
95
113
90
53
119
51
80
135
49
66
62
79
80
135
49
66
62
79
BRº
or
BPº
BSC
140
132
118
140
155
131
141
156
145
156
146
141
142
170
169
140
145
153
142
170
169
140
145
153
CRº
or
CPº
BSC
215
248
230
205
234
197
208
182
195
220
176
184
196
200
200
200
180
197
196
200
200
200
180
197
DRº
or
DPº
BSC
265
320
312
275
304
240
236
292
252
255
298
242
293
310
244
257
280
272
293
310
244
257
280
272
Dimensions shown in inches (mm)
Specifications and dimensions subject to change
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21
MIL-DTL-38999 Series I, II, III Connectors
Contact Arrangements (Engaging View Pin Insert)
* Socket insert only
** Pin insert only (Not available in socket insert Series I and III)
Indicates layouts are available in all shell styles including MS27499, MS27508, KJ2E and KJ5E
† Consult factory MS27505E/KJL5E insert availability
Series III
Series II
Series I
No. of Contacts
Service Ratings
9-98
8-98†
9-98
3 #20
I
9-35
8-35†
9-35
6 #22D
M
-
-
11-4
4 #20
I
11-5
10-5†
11-5
5 #20
I
11-98
10-98†
11-98
6 #20
I
-
10-99†
11-99
7 #20
I
11-35
10-35†
11-35
13 #22D
M
-
12-3
-
3 #16
II
-
12-4†
13-4**
4 #16
I
13-8
12-8†
13-8
8 #20
I
Series III
Series II
Series I
No. of Contacts
Service Ratings
13-98
12-98†
13-98
10 #20
I
13-35
12-35†
13-35
22 #22D
M
15-5
14-5†
15-5
5 #16
II
15-15
14-15†
15-15
14 #20,1 #16
I
15-18
14-18†
15-18
18 #20
I
15-19
-
15-19
19 #20
I
15-35
14-35†
15-35
37 #22D
M
21
31
42
Series III
Series II
Series I
No. of Contacts
Service Ratings
15-97
14-97†
15-97
8 #20,4 #16
I
17-6
16-6
17-6
6 #12
I
17-8
16-8†
17-8
8 #16
II
17-26
16-26†
17-26
26 #20
I
17-35
16-35†
17-35
55 #22D
M
_
16-42†
_
42 #22
M
-
16-99†
17-99**
21 #20,2 #16
I
Series III
Series II
Series I
No. of Contacts
Service Ratings
-
18-28
19-28**
26 #20,2 #16
I
-
18-30
19-30**
29 #20, 1 #16
I
19-11
18-11
19-11
11 #16
II
19-32
18-32†
19-32
32 #20
I
19-35
18-35†
19-35
66 #22D
M
Series III
Series II
Series I
No. of Contacts
Service Ratings
21-11
-
21-11
11 #12
I
21-16
20-16†
21-16
16 #16
II
21-35
20-35†
21-35
79 #22D
M
21-39
20-39†
21-39
37 #20,2 #16
I
21-41
20-41†
21-41
41- #20
I
Series III
Series II
Series I
No. of Contacts
Service Ratings
21-75
-
21-75*•
4 #8 Twinax
M
23-21
22-21
23-21
21 #16
II
-
22-32
23-32**
32 #20
I
23-35
22-35†
23-35
100 #22D
M
Dimensions shown in inches (mm)
Specifications and dimensions subject to change
22
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