D38999/31 for MIL-STD-1760
TV Breakaway Fail Safe –
crimp, metal
lanyard release plug
PIN CONTACTS ONLY,
SHELL SIZE 25 ONLY
D38999/31
88-555875/76
91-555875/76
.359 MAX
9.12 MAX
.100 MAX
2.54 MAX
OUTER SLEEVE MOVEMENT
DURING UNMATING
THREAD RELEASE
2.000 MAX
50.80 MAX
ACCESS.
DIA
.359 MAX
9.12 MAX
.374 MAX
9.50 MAX
OUTER SLEEVE MOVEMENT
DURING UNMATING
THREAD RELEASE
Part number reference.
See how to order, page 32 to
complete.
Type 6
Type 2
Type 1
88-558518/19
91-558518/19
T3W-16B25-XXXX
**
2.008 MAX
51.00 MAX
2.000 MAX
50.80 MAX
ACCESS.
DIA
**
2.705 MAX
68.71 MAX
METRIC
THREAD
M37X
1.0-6g0.100R
1.687 MAX
42.85 MAX
2.030 MAX
51.56 MAX
BLUE
BAND †
LANYARD LENGTH
(See Lanyard Length Table)
METRIC
1.781 MAX
THREAD
45.24 MAX
M37X
2.375 MAX
1.0-6g
60.33 MAX
0.100R
LANYARD LENGTH
(See Lanyard Length Table)
BLUE
BAND †
Tri-Start Lanyard Separation Forces
Shell
Size
25
Straight Pull
(lbs. max.)
90
15 Degree Pull
(lbs. max.)
100
TYPE 6
.280 MIN
7.11 MIN
FULL
THREAD
.359 MAX
9.12 MAX
TYPE 2
TYPE 1 (LONGER SHELL)
2.000 MAX
50.80 MAX
ACCESS.
DIA
2.008 MAX
51.00 MAX
INSERT AVAILABILITY
FAIL SAFE D38999/31
FOR MIL-STD-1760
S
R
P
Z
Y
4
7
X
L
K
J
H
3
W
G
6
2
V
5
1
T
U
A
B
C
D
E
F
METRIC
THREAD
M37X
1.0-6g0.100R
2.499 MAX
63.47 MAX
BLUE
BAND †
N
LANYARD LENGTH
(See Lanyard Length Table)
† Blue band indicates rear release
contact retention system
** Lanyard pulled taut against a
.500 ± .13 dia. mandrel
All dimensions for reference only
M
Pin Contact Data for MIL-STD-1760
Insert
Arrangement
25-20
Service
Rating
N
Total
Contacts
30
20
10
Contact
16*
12 (coax) 8 (twinax)
13*
4
3
25-20
Primary Interface Signal Set
Contacts for 25-20 Pattern
Standard Contact
Shell Arrangement
Number
Size
Service
Size
Number
of Contacts Contacts Rating
3
8
Twinax
4
12
Coax
25
-20
13
16
N
Contact
Location
Pin
Socket
A, H, K
M39029/90-529 M39029/91-530
2, 3
M39029/28-211 M39029/75-416
W, 5
M39029/102-558 M39029/103-559
C, D, E, F, M39029/58-364 M39029/56-352
J, M, N, P
R, T, U, Y, Z
B, G, L, S M39029/58-363 M39029/56-351
V, X, 1, 4
6, 7
20
2
Contact Size
10 (power)
9
H
A
B
J
C
G
L
K
D
F
E
10
20
N
25-11
Auxillary Power Signal Set
Contact
Legend
8 (twinax) 10 (power) 12 (coax) 16
20
Insert
Arrangement
25-11
Service
Rating
N
Total
Contacts
11
31
D38999/31 for MIL-STD-1760
TV Breakaway Fail Safe
for Stores Management applications
lanyard release plug – how to order
HOW TO ORDER - BY MILITARY PART NUMBER
FAIL SAFE D38999/31
Ordering procedure for example part number D38999/31WE20PN1 is
shown below:
D38999/
D38999/DOD Number
Prefix
Specification
Sheet Number
Service Class
Lanyard Length Code
Insert Arrangement
Contact Style
Polarizing Position
Type Number
31 W
E
20
P
N
1
DOD Number Prefix
D38999/ designates MIL-DTL-38999, Series III Tri-Start Connectors
Specification Sheet Number
31 designates Lanyard Release Plug for MIL-STD-1760
with pin contacts
Service Class
F designates electroless nickel plated aluminum,
optimum EMI shielding effectiveness –65dB @ 10 GHz
specification min., 48 hour salt spray, 200°C
W designates corrosion resistant olive drab cadmium
plate aluminum, 500 hour extended salt spray,
EMI –50dB @ 10 GHz specification min., 175°C
Lanyard Length Code
See Table III for lanyard length code number.
Insert Arrangement
Only 11 or 20 are available contact arrangement numbers.
See page 31.
Contact Style
Only P and A are valid contact style options. P replaces the “no designa-
tion” option in the PIN on revision C and eariler revisions of the Mil-Spec.
A designates supplied less contacts.
Polarizing Positions
N is required for normal position.
Type Number
Type 1, 2 or 6. See drawings on page 31.
For accessories for lanyard release plugs see page 33.
TABLE III
LANYARD LENGTH CODES
Lanyard
Lanyard
Lanyard Length
Length (in.) Length (mm.)
Code For
± .236
± 6.0
Part Number
6.024
153.0
E
6.535
166.0
F
7.008
178.0
G
7.520
191.0
H
7.992
203.0
I
8.504
216.0
J
9.016
229.0
K
9.528
242.0
L
32
Microcontroller MCU
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