DESCRIPTION
APPLICATIONS
The Amphenol Socapex power
connector LJT 21-48 provides
4 size 8 power contacts in a LJT 21
shell in accordance with the
MIL-DTL-38999 Series I standard.
This arrangement was originally
developped for military applications.
Due to the rigidity of the cables
used, the front male insulator has
been reinforced to maintain a perfect
alignment of contacts during mating.
A header is placed in the backshell
to guide each wire and to guarantee
tightness even when cables
are bent. Available in Mil-DTL-38999
series III standard.
Available in TV-CTV (Mil-DTL-38999
Series III) version.
New hard piggy back grommet for
easy installation.
•Power supplies
•Shelters
•Firing posts
CHARACTERISTICS
LJT 21-48
•Lightweight space saving design
•Corrosion resistance:
olive drab cadmium-plate aluminium or electroless nickel
•100% scoop-proof for complete contact protection
•Keying:
achieved by different key / keyway locations
•Quick positive coupling:
3 point bayonet locking system
•Durability:
500 cycles
•Insulation resistance at ambient under 500 Vdc > 5000 Mohms
•4 size 8 contacts
•Range temperature:
- 65°C to + 175°C
•Contact rating:
Current capability 60 A
•Service rating M:
• Operating voltage at sea level: 400 Vrms
• Test voltage unmated
- at sea level : 1300 Vrms
- at 15000 m / 50000 ft : 550 Vrms
- at 21000 m / 70000 ft : 350 Vrms
- at 34000 m / 110000 ft : 200 Vrms
• Test voltage mated, please consult us.
E117/C
High performance
for power supply
High performance
for power supply
4x60 Amps circular power connector
LJT 21-48
Hard piggy back grommet for
size 8 cavity and power cable:
ref.: 900471.
Contact Crimp barrel Cable sizes
Size Contact Diameter Depth Gauge Section Outside
diameter
mm mm AWG mm diameter
mm
mm
8 3.6 4.6 10 8 8.98 to 10 4.5/5.8
LJT 21-48 - E117/C 4/03/03 17:11 Page 2
DIMENSIONAL CHARACTERISTICS
Dimensional characteristics
•Panel drilling for square flange and jam nut receptacle
•Jam nut receptacle
A = 33.83 mm
B = 1.5000 - 18 UNEF inches
C = 43.00 mm
E = 49.23 mm
F = 52.65 mm
G = 1.1875 - 18 2 A UNEF
a = 8.33 mm Max
without protrusion of the
piggy back grommet.
•Plug
G = 1.1875 - 18 2 A UNEF
C = 41.28 mm
a = 31 mm Max
without protrusion of the
piggy back grommet.
Jam nut receptacle
back panel mounting
Ø E
F
G
V
R4 Ø W
Square flange receptacle
front panel mounting
Ø D
Shell R V W G E F D
Size
(
mm)
(
mm)
(
mm)
Mini Mini (
mm)
Mini
(
mm)
(
mm)
(
mm)
21 31.75 42.5 3.25 50.60 38.28 37.06 32.16
+0
-0.25
+0
-0.25
+0
-0.25
+0
-0.25
Panel thickness for jam nut receptacle : 1.6 mm mini
3.2 mm maxi
A = 80° B = 69° C = 121° D = 110°
Receptacle: front face shown
•Position of major key way
•Square flange receptacle
A = 33.83 mm
B = 15.29 mm
C = 31.75 mm
E = 39.67 mm
F = 3.25 mm
G = 1.1875 - 18 2 A UNEF
LJT 21-48 - E117/C 4/03/03 17:11 Page 3
•Insert arrangement: front face shown
LJT 21-48 INSERT ARRANGEMENT 21-48 PARTICULARITIES
•Side half-view of female plug/receptacle
•Side half-view of male plug/receptacle
Insert arrangement 21-48 particularities
Male plug
Female receptacle
LJT 21-48 - E117/C 4/03/03 17:11 Page 4
Tooling
Crimping plier:
Positioner:
HOW TO ORDER
E117/C
Connectors
Backshells
This connector is compatible with all backshells available for LJT connectors (MIL-DTL-38999 Series I / HE 308):
LJT NSA = HE308-13 / LJT NSB / LJT NSD = HE308-14 / LJT SAD / LJT SAC
HE308-35 band backshell (BAND-IT System).
Controlling gauge:
Metallic removal tool:
809872
809873
809877
809845
Contacts
Male contact: Female contact: 900217900198
Proprietary P/N
Shell type:
00: square flange receptacle
01: in-line receptacle
07: jam nut receptacle
06: plug
Connector class:
RT: for environmental applications (supplied without
rear accessories).
Design provides serrations on rear threads of shells.
21: shell size
48: insert arrangement (4 size 8 contacts)
Contact type:
P: pin
S: socket
Polarization, rotation of major keyway:
None = normal
A, B, C, D.
Shell finish :
014: olive drab cadmium
023: electroless nickel
LJT 00 RT 21 48 P A 014
Series
(Connector supplied with 4 contacts and 4 piggy back grommets 900471)
For additional information, please see our LJT catalog.
Do not hesitate to contact us for further information
The information given in this document is as a guideline only. We reserve the right to modify our products in any way we deem necessary. Any duplication is prohibited, unless approved in writing.
Amphenol Socapex
Mil/Aero & Industrial Business Unit
948, Promenade de l’Arve - BP 29
F - 74311 Thyez Cedex
Tel.: +33 (0) 4 50 89 28 00 - Fax: +33 (0) 4 50 96 19 41
http://www.amphenol.com
Sales office in Paris
Tel.: +33 (0) 1 49 05 30 00 - Fax: +33 (0) 1 49 05 30 43
Amphenol
Reducing sleeve for AWG10: 900154 Piggy Back grommet: 900471
Numerous piggy back grommets are available depending to cable diameters. Please consult us.
LJT 21-48 - E117/C 4/03/03 17:10 Page 1
