Environmental/Hermetic Connectors
MIL-DTL-38999
Series III and IV
OCTOBER 2017
Industry-Standard • Military / Aerospace • Harsh-Environment
HERMETIC AND
ENVIRONMENTAL
MIL-DTL-38999
Series III and IV
D
The industry standard mil/
aero connector backed by
Glenair service and availability
LA certified environmental and hermetic class MIL-DTL-38999 Series III and IV
connectors are the most widely used and requested connectors within the mil-
aero industry—and for good reason. Developed for reliability, the Series III triple-
start thread prevents galling and cross-threading while providing quick disconnect,
single-turn action to engage self-locking, metal-to-metal coupling. Series IV offers
the industry’s most robust mating with a 90 degree quarter-turn breech-lock mate
with visual, tactile and audible engagement confirmation. The rugged construction
of the Series IV disperses the mating force across a channeled metal flange while
threaded mechanical force provides friction, locking the mates halves securely. Both
series feature accessory threads and environmental sealing for reliable attachment
of backshells. Scoop-proof shell design protects crimp-removable contacts from
damage. Integrated plug-to-receptacle grounding and shell-to-shell bottoming
delivers 65dB minimum shielding at 10 GHz.
Both series III and IV support all MIL-STD-1560 insert arrangements. Qualified
environmental-class Series III connectors are supplied with W, F, G and T class
materials and plating. Classes F and W are supplied for Series IV. Hermetic versions
of Series III and IV are available in classes Y and N.
2
DLA QPL MIL-DTL-38999
SERIES III AND IV AVAILABLE
FROM GLENAIR
Qualified environmental plug,
jam-nut, and square flange,
box mount, wall mount and
solder mount connectors
1560 crimp-contact insert
All
arrangements fully supported
Environmental and hermetic
versions available with
plating classes IAW 38999
MIL-DTL Series III and IV
100% made in America
A
interconnect: No foreign-
sourced materials, component
parts, or assembly labor
employed
© 2017 Glenair, Inc • 1211 Air Way, Glendale, CA 91201 • 818-247-6000 • www.glenair.com • U.S. CAGE code 06324 • MIL-DTL-38999 Series III and IV
Dimensions in inches (millimeters) are subject to change without notice
QPL QUALIFIED AND COTS EQUIVALENT
MIL-DTL-38999 Series III and IV
Product selection guide
Reference Section
MIL-STD-1560 standard power and signal contact insert arrangements .
MIL-STD-1560 hi-speed contact insert arrangements . . . . . . . . . . . . .
MIL-STD-1560 combo contact insert arrangements . . . . . . . . . . . . . .
Space-grade guidelines for commercial parts . . . . . . . . . . . . . . . . .
Series III recommended panel cut-outs . . . . . . . . . . . . . . . . . . . . .
Series III alternate key and keyway polarization . . . . . . . . . . . . . . . .
Series IV recommended panel cut-outs . . . . . . . . . . . . . . . . . . . . .
Series IV alternate key and keyway polarization . . . . . . . . . . . . . . . .
Series III and IV material and finish . . . . . . . . . . . . . . . . . . . . . . . .
Contacts and Tools
Pin contact selection guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Socket contact selection guide . . . . . . . . . . . . . . . . . . . . . . . . . .
Crimp, insertion and removal tools . . . . . . . . . . . . . . . . . . . . . . . .
Series III QPL qualified and COTS equivalent environmental
connectors
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D38999/26 plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D38999/24 jam-nut mount receptacle . . . . . . . . . . . . . . . . .
D38999/20 wall mount receptacle . . . . . . . . . . . . . . . . . . .
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.22
.24
.26
.28
.30
.32
.34
.36
.38
Series III QPL qualified and COTS equivalent hermetic connectors
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D38999/21 box mount receptacle . . . . . . . . . . . . . . . . . . . . . . . .
D38999/25 solder mount receptacle . . . . . . . . . . . . . . . . . . . . . .
D38999/23 jam-nut mount receptacle . . . . . . . . . . . . . . . . . . . . .
D38999/27 weld mount receptacle . . . . . . . . . . . . . . . . . . . . . . .
Series IV QPL qualified and COTS equivalent environmental connectors
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
D38999/46 and 47 plug with or without EMI ground spring . . . . . . . . .42
D38999/40 wall mount receptacle . . . . . . . . . . . . . . . . . . . . . . . . 44
D38999/42 box mount receptacle . . . . . . . . . . . . . . . . . . . . . . . . . 46
D38999/44 jam-nut mount receptacle . . . . . . . . . . . . . . . . . . . . . . 48
D38999/49 in-line receptacle . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Series IV QPL qualified and COTS equivalent hermetic connectors
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D38999/41 box mount receptacle . . . . . . . . . . . . . . . . . . . . . . . . .
D38999/43 jam-nut mount receptacle . . . . . . . . . . . . . . . . . . . . . .
D38999/45 solder mount receptacle . . . . . . . . . . . . . . . . . . . . . . .
D38999/48 weld mount receptacle . . . . . . . . . . . . . . . . . . . . . . . .
© 2017 Glenair, Inc • 1211 Air Way, Glendale, CA 91201 • 818-247-6000 • www.glenair.com • U.S. CAGE code 06324 • MIL-DTL-38999 Series III and IV
Dimensions in inches (millimeters) are subject to change without notice
.52
.54
.56
.58
60
3
QPL QUALIFIED AND COTS EQUIVALENT
MIL-DTL-38999 Series III and IV
MIL-STD-1560 standard power and signal contact arrangements
For environmental and hermetic connectors
REFERENCE INFORMATION
4
Contacts
Contact Size (environmental contacts shown in pictures below)
Size #22D
Environmental: 5 Amp Max. Current
Hermetic: 3 Amp Max. Current
#22-#24 AWG
Size #20 Contacts
Environmental: 7.5 Amp Max. Current
Hermetic: 5 Amp Max. Current
#20-#24 AWG
Size #16 Contacts
Environmental 13 Amp Max. Current
Hermetic: 5 Amp Max. Current
#16-#20 AWG
Size #12 Contacts
Environmental 23 Amp Max. Current
Hermetic: 5 Amp Max. Current
#12-#14 AWG
Contact Size 22D
Number of
Conctacts
6
13
22
37
55
66
67
79
100
128
D38999
Sr III
A35
B35
C35
D35
E35
F35
F45
G35
H35
J35
D38999
Sr IV
B35
C35
D35
E35
F35
F45
G35
H35
J35
Number of
Conctacts
3
4
5
6
7
8
10
18
19
26
32
24
25
27
41
32
34
36
53
55
61
Contact Size 20
D38999
Sr III
A98
B4
B5
B98
B99
C8
C98
D18
D19
E26
F32
G24
G25
G27
G41
H32
H34
H36
H53
H55
J61
D38999
Sr IV
B4
B5
B98
B99
C8
C98
D18
D19
E26
F32
G24
G25
G27
G41
H32
H34
H36
H53
H55
J61
Contact Size 16
Number of
Conctacts
2
4
5
8
11
16
21
16
11
29
37
D38999
Sr III
B2
C4
D5
E8
F11
G16
H21
H97
H99
J29
J37
D38999
Sr IV
B2
C4
D5
E8
F11
G16
H21
H97
H99
J29
J37
Contact Size 12
Number of
Conctacts
6
11
19
D38999
Sr III
E6
G11
J19
D38999
Sr IV
E6
G11
J19
38999 Series III and IV Shell Size Code Reference
Shell size
9
11
13
Code
letter
A
B
C
Shell size
15
17
19
Code
letter
D
E
F
Shell size
21
23
25
Code
letter
G
H
J
© 2017 Glenair, Inc • 1211 Air Way, Glendale, CA 91201 • 818-247-6000 • www.glenair.com • U.S. CAGE code 06324 • MIL-DTL-38999 Series III and IV
Dimensions in inches (millimeters) are subject to change without notice
QPL QUALIFIED AND COTS EQUIVALENT
MIL-DTL-38999 Series III and IV
MIL-STD-1560 standard power and signal contact arrangements
For environmental and hermetic connectors - pin front view
REFERENCE INFORMATION
Contact Legend
#22D
#16
#20
#12
5
4
3
6
1
2
C
B
A
B
A
D A
D
E
A
B
C
A
E
D
F
C
B
E
F
G
D
A
B
C
C B
Insert Arrangement
No. of Contacts and Contact Size
Service Rating
A35
6 #22D
M
A98
3 #20
I
B2
2 #16
I
B4
4 #20
I
B5
5 #20
I
B98
6 #20
I
B99
7 #20
I
Contact Legend
#22D
#16
#20
#12
9
8
7
10 1
2
11
13 12
6
5
A
G
B
F
E
H
A
B
C
D
G
H
K
A
J
B
C
21
22
1
E
A
B
3
4
D
C
F
E
D
D
C
Insert Arrangement
No. of Contacts and Contact Size
Service Rating
B35
13 #22D
M
C4
4 #16
I
C8
8 #20
I
C98
10 #20
I
C35
22 #22D
M
D5
5 #16
II
L
A
N
U
P
R
F
E
D
B
C
K
J
H
L
U
M
N
A B
P
V
R
S
G
F
E
C
D
1
E
A
G
A
B
H
F
C
E
D
Contact Legend
#22D
#16
#20
#12
K
J
H
G
T
M
31
S
T
21
D
F
B
C
Insert Arrangement
No. of Contacts and Contact Size
Service Rating
D18
18 #20
I
D19
19 #20
I
D35
37 #22D
M
E6
6 #12
I
E8
8 #16
II
R
P
A
S
T
b
c
B
U
V
W
Contact Legend
#22D
#16
#20
#12
C
D
E
F
3
1
4
10
17
25
32
40
J
47
53
G
55
F
E
H
K
A
B
P
L
D
C
N
M
L
c
R
S
e
d
T
U
f
j
h
A
V
g
Y
B
C
W
X
F
G
H
D
E
N
M
L
K
a
Z
Y
X
J
H
b
a
K
J
Z
G
9
16
24
31
39
46
52
Insert Arrangement
No. of Contacts and Contact Size
Service Rating
E26
26 #20
I
E35
55 #22D
M
F11
11 #16
II
F32
32 #20
I
4
10
17
25 34
43
51
58
64
65
4
1
2
3
9
10 17
25
35
44 52
59
65
G
H
J
A
L
K
M
S
R
N
P
A
B
C
D
Contact Legend
#22D
#16
#20
#12
1
2
3
9
16
57
63
K
B
J
H
66
67
16
58
64
F
L
C
24
33 42
50
24
51
34 43
E
D
G
F
E
Insert Arrangement
No. of Contacts and Contact Size
Service Rating
F35
66 #22D
M
F45
67 #22D
M
G11
11 #12
I
G16
16 #16
II
© 2017 Glenair, Inc • 1211 Air Way, Glendale, CA 91201 • 818-247-6000 • www.glenair.com • U.S. CAGE code 06324 • MIL-DTL-38999 Series III and IV
Dimensions in inches (millimeters) are subject to change without notice
5
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