MIL-DTL-38999, Series II JT
MIL-DTL-38999, Series I LJT
Amphenol
Aerospace
Features & Benefits
Amphenol
®
LJT and JT Series subminiature cylindrical
connectors are qualified to MIL-DTL-38999*, Series I
and II respectively. These connectors were developed
to meet the needs of the aerospace industry, and
provided the impetus for development of the
MIL-C-38999 specifications, which has been
superseded by MIL-DTL-38999. Meeting or exceeding
MIL-DTL-38999 requirements, Amphenol
®
JT/LJT
connectors feature:
38999
MIL-DTL-38999
Series I LJT
Components
Shell components are impact extruded or machined bar stock
aluminum. Standard plating on shell components is cadmium over
nickel. Many finishes are optional (see “Specifications” page 19).
Hermetic seal receptacles are available in carbon steel or stainless
steel shells. Dependable 5 key/keyway polarization with bayonet lock
coupling is incorporated to aid and assure positive mating.
Insert material is a rigid dielectric with excellent electrical character-
istics, providing durable protection for molded-in solder type contacts.
Contrasting letter or number designations are used on insert faces.
A fluorinated silicone interfacial seal wafer is featured on the mating
face of “crimp type pin” inserts. This assures complete electrical
isolation of pins when connector halves are mated. In addition, a main
joint gasket is installed in the receptacle for moisture sealing between
connector halves. Both features are also available for hermetic
receptacles.
Contacts
Maximum design flexibility is built into the JT/LJT Series, with a mini-
mum of 2 to a maximum of 128 circuits per connector in a wide variety
of contact arrangements. Contacts are available in sizes 8, 10, 12, 16,
20, 22, 22D and 22M with standard 50 micro inch minimum gold plating
(100 micro inches optional). All socket contacts are probe proof. Crimp
type rear removable contacts are featured in JT-R and LJT-R
connectors. Solder termination contacts are also available, as well as
PCB, wire wrap, thermocouple, fiber optic, coaxial, triaxial and twinax
contact options.
• Lightweight, Space Saving Design
• Contact Protection - 100%
scoop-proof LJT design prevents
bent pins and short circuits during mating
• Quick Positive Coupling
- 3 point bayonet lock system
• Mismating Eliminated -
with 5 key/keyway design
• Error Proof Alternate Positioning
- insured by different key/
keyway locations
• EMI Shielding
- grounding fingers standard in LJT Series;
optional in JT Series
• Nine Shell Sizes and a Variety of Shell Styles
• Contact Options
- size 8, 10, 12, 16, 20, 22M and 22D Crimp,
Solder, PCB, Wire wrap, Coax, Twinax, Triax, Thermocouple,
Fiber Optic and Filter
• Fixed Solder Contacts
- Amphenol MIL-DTL-38999 Series I
LJT and II JT, are available in solder versions as both
Commercial and Military qualified to MIL-DTL-27599
• Hermetic -
air leakage limited to 1 X 10
-7
cm
3
per second
optional
• “Breakaway” Lanyard Release Style -
available in LJT plugs.
Provides quick disconnect of the connector plug and receptacle
with axial pull on the lanyard. See pages 94-96.
• Inventory Support Commonality
- uses standard
MIL-DTL-38999 contacts, insert arrangements and
application tools.
•
RoHS Compliant Product Available -
Consult Amphenol Aerospace Operations.
III
HD
Dualok
II
I
SJT
A
ccessories
A
quacon
H
erm/Seal
PCB
HIgH
SPEED
Fiber
Optics
Contacts
Cables
Connectors
EMI Filter
Transient
Matrix 2
Matrix|Pyle
Pyle
Crimp Rear
Release
Matrix
26482
83723 III
5015
26500
Optional Features
High temperature capability of 392°F is available only in JTS or LJTS
crimp type connectors. High temperature versions feature gold plated
contacts, high temperature shell plating, stainless steel coupling nut
spring, and epoxy inserts/fluorinated silicone grommet combination.
Standard temperature capability for both solder and crimp is 302°F.
The JTN or LJTN type connectors are available for N
2
O
4
resistance
provided they are mated, and un-grommeted rear faces are
suitably protected.
For complete listing and definition of connector types, shell styles and
service classes, see How to Order, pages 62 & 63. For information on
Fail-Safe Lanyard Release style plugs, see pages 94–96.
22992
Class L
Back-
Shells
Options
Others
Where proof of high reliability and lot control is required, MS approved
equivalents to most proprietary JT and LJT connectors are available.
* MIL-DTL-38999 Series I supersedes MIL-C-38999 Series I.
MIL-DTL-38999 Series II supersedes MIL-C-38999 Series II.
MIL-DTL-38999
Series II JT
Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com
61
Amphenol
Aerospace
38999
III
HD
Dualok
II
I
SJT
MIL-DTL-38999/ 27599, Series II JT
MIL-DTL-38999/ 27599, Series I LJT
How to Order (Commercial)
Commercial
1.
2.
Connector Type
Series I
II
LJT
JT
00
Easy Steps to build a commercial part number... Series I and II
3.
Service Class
RT
4.
Shell Size-
Insert Arrangement
9-35
5.
Contact
Type
P
6.
Alternate
Position
B
SR
7.
Strain Relief/Finish
Variation Suffix
(014)
Shell Style
A
ccessories
A
quacon
H
erm/Seal
PCB
Step 1.
Select a Connector Type
1.
Connector
Type
JT
2.
Shell Style
3.
Service Class
4.
Shell Size-
Insert Arrg.
5.
Contact Type
6.
Alternate
Position
7.
Special
Variations
Series I LJT
Series II JT
HIgH
SPEED
Fiber
Optics
Connectors
Series I
Series II
JT
Designates
Standard Junior Tri-Lock
Long Junior Tri-Lock
LJT
LJTS
LJTN
JTS
JTN
JTL
JTLN
JTLS
LJTPQ
LJTP
LJTPN
LJTPS
JTPQ
JTP
JTPN
JTPS
JTG
JTNG
Contacts
Cables
High temperature connector
Chemical and fuel resistant
Miniature mounting dimensions
Miniature mounting dimensions–Chemical resistant
Miniature mounting dimensions– High temperature
Back panel mounted wall mounting receptacle
Back panel mounted box mounting receptacle
Back panel mounted–Chemical resistant
Back panel mounted–High temperature
Plug with grounding fingers*
Plug with grounding fingers* –Chemical resistant
Wall
Mounting
Receptacle
Wall
Mounting
Receptacle
Matrix 2
26482
EMI Filter
Transient
Line
Receptacle
Box
Mounting
Receptacle
83723 III
Matrix|Pyle
Jam
Nut
Receptacle
Straight
Plug
*Grounding fingers standard on all LJT plugs
26500
Step 2.
Select a Shell Style
1.
Connector Type
Pyle
2.
Shell Style
00
3.
Service Class
4.
Shell Size-
Insert Arrg.
5.
Contact Type
6.
Alternate
Position
7.
Special
Variations
Straight
Plug
Jam Nut
Receptacle
Crimp Rear
Release
Matrix
5015
22992
Class L
JT
JTS
JTN
LJT
LJTS
LJTN
JTL
JTLN
JTLS
JTPQ
JTP
JTPN
JTPS
LJTPQ
LJTP
LJTPN
LJTPS
00
JTG
Designates
JTNG
00
Wall mount receptacle (Hermetic option)
Line mount receptacle
(Non-hermetic)
Solder
Mounting
Receptacle
90° Plug
Back-
Shells
01
02
02
06
07
08
Options
Others
Box mount receptacle
(Hermetic Option except for LJT)
Straight plug (Non-hermetic)
Jam nut receptacle (Hermetic Option)
90 degree plug (Non-hermetic)
Solder mount receptacle (hermetic)
06
07
08
I
Lanyard
Release
Plug
(See pages
94-96 for
ordering)
Solder
Mounting
Receptacle
62
Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com
MIL-DTL-38999/ 27599, Series II JT
MIL-DTL-38999/ 27599, Series I LJT
How to Order (Commercial)
Step 3.
Select a Service Class
JT
P
A
JTS
JTN
P
A
A
JTG
JTNG
LJTS
LJT
P
Amphenol
Aerospace
38999
3.
Service
Class
RX
1.
Connector
Type
2.
Shell Style
4.
Shell Size-
Insert Arrg.
5.
Contact Type
6.
Alternate
Position
7.
Special
Variations
Series I LJT
Solder Contacts/Connectors
Potting applications: These connectors are supplied with a potting boot. All shells
are designed with integral features to retain potting boots.
General Applications (JT only molded in solder type contacts)
Threaded rear design with strain relief†
A (SR)
C
C
III
HD
Dualok
II
I
SJT
A
ccessories
A
quacon
H
erm/Seal
PCB
Series II JT
Pressurized applications
Threaded rear design with strain relief.†
C (SR)
H
Y
T
H
Y
Y
H
Y
T
HIgH
SPEED
Fiber
Optics
Contacts
Cables
Connectors
Hermetic applications- Fused compression glass sealed inserts. Leakage rate less
than .01 micron cu. ft./hr. (1 x 10-7 cc/sec.) at 15 psi differential.
Same as “H” with interfacial seal.
MIL-DTL-27599 applications-general duty, pressurized (receptacle only) (LJT only
molded in solder type contacts)
EMI Filter
Transient
JT
JTN
JTG
JTNG
JTPQ
LJT
JTPQ
LJTPQ
RP
RE
RT
JTS
JTLS
JTL
JTLN
LJTP
LJTS
JTPS
LJTPS
Crimp Contacts/Connectors
Matrix 2
26482
RP
RE
RT
RP
RE
RP
RE
RT
RE
RT
RE
RT
Potting crimp applications. Supplied with spacer grommet and potting boot.††
Environmental crimp applications. Supplied with a grommet and compression nut.†
Can be supplied with strain relief integral with compression nut “RE(SR)”.
Environmental applications. Supplied without rear accessories. Design provides
serrations on rear threads of shells.
83723 III
Matrix|Pyle
Pyle
26500
† Not applicable to box mounting style or LJT Series I.
†† Not applicable to box mounting style.
Crimp Rear
Release
Matrix
5015
Step 4.
Select a Shell Size &
Insert Arrangement see page 6-9
First number represents Shell Size,
second number is the Insert Arrangement.
1.
Connector
Type
2.
Shell Style
3.
Service Class
4.
Shell Size-
Insert Arrg.
22-2
5.
Contact Type
6.
Alternate
Position
7.
22992
Special
Variations
Class L
Back-
Shells
Step 5.
Select a Contact Type
Designates
P
S
Pin Contacts
Socket Contacts
1.
Connector
Type
2.
Shell Style
3.
Service Class
4.
Shell Size-
Insert Arrg.
5.
Contact
Type
P
6.
Alternate
Position
7.
Special
Variations
Options
Others
63
Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com
Amphenol
Aerospace
38999
III
HD
Dualok
II
I
SJT
MIL-DTL-38999/ 27599, Series II JT
MIL-DTL-38999/ 27599, Series I LJT
How to Order (Commercial)
1.
Connector Type
2.
Shell Style
3.
Service Class
4.
Shell Size
Insert Arrg.
5.
Contact Type
6.
Alternate
Position
A
7.
Special
Variations
JT
Key/Keyway Rotation
AB ANGLE OF ROTATION (Degrees)
Shell Size
8
10
12
C
ROTATION
LETTERS
Normal
100°
100°
100°
100°
100°
100°
100°
100°
100°
A
82°
86°
80°
79°
82°
82°
82°
85°
85°
B
-
72°
68°
66°
70°
70°
70°
74°
74°
C
-
128°
132°
134°
130°
130°
130°
126°
126°
D
118°
114°
120°
121°
118°
118°
118°
115°
115°
A
ccessories
A
quacon
H
erm/Seal
PCB
Step 6.
Select an
Alternate Keying Position
“A” designates Alternate keying
connector assembly. Other basic
alternate keys are “B”, “C” and “D”.
No letter required for normal rotation
(no rotation) position.
B
AB
NORMAL
A
D
14
16
18
20
22
24
HIgH
SPEED
Fiber
Optics
Connectors
Contacts
Cables
Matrix 2
26482
A plug with a given rotation letter
will mate with a receptacle with the
same rotation letter. The AB angle
for a given connector is the same
whether it contains pins or sockets.
Only the master key/keyway rotates
in the shell, and the minor keys are
fixed.
AB angles shown are viewed from
the front face of the connector, a
receptacle is shown below. The
angles for the plug are exactly the
same except the direction of rotation
is opposite of that shown for the
receptacle.
The “N” designation is not referenced in
part number, it is omitted.
10˚ JT REF
RELATIVE POSSIBLE POSITION
OF ROTATED MASTER KEYWAY
(front face of receptacle shown)
LJT
Key/Keyway Rotation
AB ANGLE OF ROTATION (Degrees)
Shell Size
Normal
95°
95°
95°
95°
95°
95°
95°
95°
95°
A
77°
81°
75°
74°
77°
77°
77°
80°
80°
B
-
67°
63°
61°
65°
65°
65°
69°
69°
C
-
123°
127°
129°
125°
125°
125°
121°
121°
D
113°
109°
115°
116°
113°
113°
113°
110°
110°
EMI Filter
Transient
B
AB
NORMAL
A
D
C
ROTATION
LETTERS
9
11
13
15
17
5° LJT REF
RELATIVE POSSIBLE POSITION
OF ROTATED MASTER KEYWAY
(front face of receptacle shown)
19
21
23
25
83723 III
26500
Pyle
Matrix|Pyle
1.
Connector
Type
2.
Shell Style
3.
Service Class
4.
Shell Size-
Insert Arrg.
5.
Contact Type
6.
Alternate
Position
7.
Special
Variations
( )
Finish
Cadmium plated nickel base
175°C
Olive drab cadmium plate
nickel base 175°C
Electroless nickel 200°C
Electroless nickel, space
compatible 200°C
Anodic coating (Alumilite)
200°C
Chromate treated (Iridite
14-2) 125°C
Passivated steel 200°C
Nickel-PTFE 175°C
Crimp Rear
Release
Matrix
Military
Finish Data
A
B
F
Finish
Suffix
Finish Plus
“SR” Suffix
(SR)
5015
22992
Class L
Step 7.
Select a Strain
Relief Option or Finish
Variation Suffix
Strain Relief Options: “SR” designates a strain
relief clamp. Strain reliefs are available only on
Service Class “A”, “C” and “RE” (see step 3.
Service Class)
Finish Variation Suffix: See finish variations
available in table to your right.
(014)
(023)
(453)
(386)
(424)
(467)
(300)
(344)
-
Back-
Shells
C
(005)
(011)
Options
Others
E
-
(038)
64
Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com
MIL-DTL-38999/ 27599, Series II JT
MIL-DTL-38999/ 27599, Series I LJT
How to Order (Military)
Amphenol
Aerospace
38999
III
HD
Dualok
II
I
SJT
A
ccessories
A
quacon
H
erm/Seal
pCB
Military
1.
MS Number
MS27473
Easy Steps to build a Military part number... Series I and II
2.
Service Class
E
3.
Shell Size
14
4.
Finish
A
5.
Insert
Arrangement
18
6.
Contact Style
(P or S)
P
7.
Alternate Keying
Position
A
Step 1.
Choose your Military Connector Type
1.
MS Number
MS27473
2.
Service Class
3.
Shell Size
4.
Finish
5.
Insert
Arrangement
6.
Contact Style
(P or S)
7.
Alternate
Position
Series II JT
MIL-DTL-38999
MS27472
MS27497
MS27499
MS27513
MS27508
MS27473
MS27484
MS27474
MS27500
MS27475
MS27476
MS27477
MS27478
MS27334
MS27335
MS27336
MS27337
Crimp Wall Mount Receptacle
Crimp Wall Mount Receptacle (Back Panel
Mounting)
Crimp Box Mounting Receptacle
Crimp Box Mounting Receptacle with grommet
Crimp Box Mounting Receptacle (Back Panel
Mounting)
Crimp Straight Plug
Crimp Straight Plug with Grounding Fingers
Crimp Jam Nut Receptacle
Crimp 90° plug
Hermetic Wall Mounting Receptacle
Hermetic Box Mounting Receptacle
Hermetic Jam Nut Receptacle
Hermetic Solder Mounting Receptacle
MIL-DTL-27599
Solder Wall Mount Receptacle
Solder Box Mounting Receptacle
Solder Straight Plug
Solder Jam Mounting Receptacle
MS20026
MS20027
MS20028
MS20029
MS27466
MS27656
MS27496
MS27505
MS27467
MS27468
MS27469
MS27470
MS27471
Series I LJT
MIL-DTL-38999
Crimp Wall Mount Receptacle
Crimp Wall Mount Receptacle (Back Panel
Mounting)
Crimp Box Mounting Receptacle
Crimp Box Mounting Receptacle (Back Panel
Mounting)
Crimp Straight Plug
Crimp Jam Nut Receptacle
Hermetic Wall Mounting Receptacle
Hermetic Jam Nut Receptacle
Hermetic Solder Mounting Receptacle
MIL-DTL-27599
Solder Wall Mounting Receptacle
Solder Line Receptacle
Solder Straight Plug
Solder Jam Nut Receptacle
HigH
Speed
Fiber
Optics
Contacts
Cables
Connectors
eMi Filter
Transient
Matrix 2
Matrix|pyle
pyle
Crimp Rear
Release
Matrix
26482
83723 iii
5015
26500
Step 2.
Select a Military Service Class
1.
MS Number
22992
2.
Service
Class
E
3.
Shell Size
4.
Finish
5.
Insert
Arrangement
6.
Contact Style
(P or S)
7.
Alternate
Position
Class L
Military
E
P
T
Y
Service Class
Environmental crimp applications. Supplied with a grommet and compression nut.† Can be supplied with strain relief integral
with compression nut “RE(SR)”. (JT Series only). Box Mount versions using spacer grommets are not environmental.
Potting crimp applications. Supplied with spacer grommet and potting boot.††
Environmental applications. Supplied without rear accessories. Design provides serrations on rear threads of shells.
(Not applicable to solder type or hermetics)
Hermetically interfacial seal
Back-
Shells
Options
Others
† Not applicable to box mounting style or LJT Series I.
†† Not applicable to box mounting style.
Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com
65
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