MIL-DTL-38999 Connectors Series III & IV,
Circular Connectors, -65°C to +200°C
 Part Number Ordering Information:
D38999
/XX
X
X
XX
X
X
Military 
Specification
Number
Specification Slash Sheet
Class
Shell Size
Arrangement Number
Contact Type
Insert Polarization
 
MILITARY SPECIFICATION NUMBER AND STYLE
Series III 
Scoop-Proof
3 Way Self Locking
Threaded Coupling
Series IV
Scoop Proof
Breech Coupling
Style Description
D38999/20
D38999/40
 Receptacle, Wall Mount Flange 
D38999/24
D38999/44
 Receptacle, Jam Nut Mount 
-
D38999/42
 Receptacle, Box Mount 
-
D38999/47
 Plug
D38999/26
D38999/46
 Plug, EMI Grounding Fingers 
D38999/21
D38999/41
 Receptacle, Box Mount, Hermetic 
D38999/23
D38999/43
 Receptacle, Jam Nut Mount, Hermetic 
D38999/25
D38999/45
 Receptacle, Solder Mount, Hermetic 
D38999/27
D38999/48
 Receptacle, Weld Mount, Hermetic 
 
CLASS DESCRIPTION
CONTACT TYPE
INSERT POLARIZATION
F = Environment Resisting,  
Conductive Electroless Nickel 
Coating 		 P = Pin  Blank = Normal 
N = Hermetically Sealed,  
Corrosion Resistant Steel, 
Conductive Electro- 
Deposited Nickel Finish 		 S = Socket  A, B, C, D =  
Alternate Positions 
Y = Hermetically Sealed,  
Corrosion Resistant Steel,  
Conductive Passivated Finish 		 Y = Hermetic Pins with Eyelet 
Z = Hermetic Sockets with Eyelet 
 
SHELL SIZE
Designator
Shell Size
A
9
B
11
C
13
D
15
E
17
F
19
G
21
H
23
J
25
 
SHELL SIZE AND INSERT ARRANGEMENT COMBINATIONS
Designation 
(Letter Indicates Shell Size/Number Indicates Arrangement)
No. of Contacts 
(By Contact Size)
Designator
Series III
Series IV
22D
20
16
12
Shell Size A (Click to See Insert Arrangements)
A35
X
--
6
-
-
-
A98
X
--
-
3
-
-
Shell Size B (Click to See Insert Arrangements)
B4
X
--
-
4
-
-
B5
X
X
-
5
-
-
B35
X
X
13
-
-
-
B98
X
--
-
6
-
-
B99
X
X
-
7
-
-
Shell Size C (Click to See Insert Arrangements)
C4
X
X
-
-
4
-
C8
X
--
-
8
-
-
C35
X
X
22
-
-
-
C98
X
X
-
10
-
-
Shell Size D (Click to See Insert Arrangements)
D5
X
X
-
-
5
-
D15
X
--
-
14
1
-
D18
X
X
-
18
-
-
D19
X
X
-
19
-
-
D35
X
X
37
-
-
-
D97
X
X
-
8
4
-
Shell Size E (Click to See Insert Arrangements)
E6
X
X
-
-
-
6
E8
X
X
-
-
8
-
E26
X
X
-
26
-
-
E35
X
X
55
-
-
-
E99
X
X
-
21
2
-
Shell Size F (Click to See Insert Arrangements)
F11
X
X
-
-
11
-
F32
X
X
-
32
-
-
F35
X
X
66
-
-
-
Shell Size G (Click to See Insert Arrangements)
G11
X
X
-
-
-
11
G16
X
X
-
-
16
-
G35
X
X
79
-
-
-
G39
X
--
-
37
2
-
G41
X
X
-
41
-
-
Shell Size H (Click to See Insert Arrangements)
H21
X
X
-
-
21
-
H35
X
X
100
-
-
-
H53
X
--
-
53
-
-
H55
X
X
-
55
-
-
Shell Size J (Click to See Insert Arrangements)
J4
X
X
-
48
8
-
J19
X
X
-
-
-
19
J24
X
X
-
-
12
12
J29
X
X
-
-
29
-
J35
X
X
128
-
-
-
J43
X
--
-
23
20
-
J61
X
X
-
61
-
-