Positronic Industries
.connectpositronic.com
HEAVY-DUTY RECTANGULAR
CONNECTORS WITH
REMOVABLE CONTACTS
S
tandard
D
ensity
R
ectangular
IT
POS
Di
rec
1
tive
2002
/9
5/
Compliant
EC
•
GMCT SERIES
Size 16 and 20 Contacts
Connectors Qualified to
MIL-DTL-28748
Contacts Qualified to
SAE AS 39029
IEC Publication 807-7
U.L. Recognized,
File #E49351
Telecommunication
U.L. File #E140980
contacts are qualified to SAE AS 39029.
A wide array of mounting, locking, shrouding and polarizing
accessories is available for this series. For details, see the
Heavy-Duty Rectangular Connector Accessories section.
Due to its many termination styles, its wide range of contact
variants, and an array of cable support accessories, GMCT
Series connectors are widely utilized in navigational systems,
robotics, mainframe and peripheral computers, medical
equipment, telecommunications, instrumentation and process
control applications.
GMCT Series connectors are heavy-duty, multi-pole, high
reliability connectors qualified to MIL-DTL-28748 specifica-
tions. Termination styles are crimp, solder cup, straight sol-
der, wrap post, press-fit, and crimp shielded. According to
contact size selected, GMCT Series connectors are inter-
mateable with Positronic GAP and GAPL series connectors.
Thirteen contact variants, 9 through 104 poles, are offered.
Contacts can have 0.062 inch [1.57mm] diameters, rated to
13 amperes per contact, or have 0.040 inch [1.02mm] diame-
ters, rated to 7.5 amperes per contact. GMCT Series crimp
GMCT SERIES TECHNICAL CHARACTERISTICS
MILITARY SPECIFICATIONS:
Qualified to MIL-DTL-28748/3 and MIL-
DTL-28748/4. Contacts qualified to SAE
AS 39029/34 and SAE AS 39029/35.
Locking Systems:
Polarization:
Mechanical Operations:
Jackscrews:
Friction, vibration locks and jackscrews.
Polarized guides, polarized shells and
jackscrew system.
1000 operations per IEC 512-5.
Standard threads, 6-32 UNC on all
sizes, except 60 and 104 connector
variant, which uses 8-32 UNC. Metric
threads, M3X0.5 available.
UNDERWRITERS LABORATORY RECOGNIZED:
File No. E49351.
INTERNATIONAL STANDARDS:
IEC 807-7.
U.L. Recognized.
ELECTRICAL CHARACTERISTICS:
Contact Current Rating
(maximum):
Size 16: 0.062 inch [1.57 mm] diameter.
- 13 amps maximum.
Size 20: 0.040 inch [1.02 mm] diameter.
- 7.5 amps maximum.
Initial Contact Resistance:
Size 16 – 0.003 ohms.
Size 20 – 0.007 ohms.
Flash over Voltage:
2700 V.AC [rms].
Test Voltage:
Size 16 - 2000 V.AC [rms].
Size 20 - 1200 V.AC [rms].
Insulation Resistance
(minimum):
5 G ohms.
Clearance and Creepage
Distance (minimum):
0.080 inch [2.03 mm].
Working Temperature:
-65°C to 150°C.
Working Voltage:
500 V.AC [rms].
Coaxial Contacts:
Characteristic Impedance:
50 ohms.
Initial Contact Resistance:
0.012 ohms max.
MATERIALS AND FINISHES:
Insulator:
Glass filled DAP per ASTM-D-5948 type
SDG-F. Grey color is standard, black
available.
Copper alloy, gold flash over nickel. Military
contacts plated 0.000050 inch [1.27 microns]
gold over copper. Other finishes available
upon request.
Aluminum with yellow or black anodize.
Aluminum with yellow or black anodize.
Passivated stainless steel.
Copper alloy with nickel plate or passi-
vated stainless steel.
Copper alloy with zinc plate and chro-
mate seal.
Removable Contacts:
Hoods, Cable Adapters:
Shells:
Jackscrew System:
Polarizing Guides:
Vibration Locks:
MECHANICAL CHARACTERISTICS:
Removable Contacts:
Insert contact to rear face of insulator,
release from front face of insulator. Both
size 16 [13 amps] and size 20 [7.5
amps] contacts available. Female con-
tact has “closed entry” design for highest
reliability.
Contact Retention in Insulator:
20 lbs. [89N] after 10 cycles of contact
insertion/extraction.
Contact Termination:
Crimp all wire sizes from 14 AWG [2.5
mm
2
] through 28 AWG [0.08 mm
2
]. Also,
solder cup, press-fit, wrap post and sol-
der printed board terminations. Also,
crimp and shielded contacts.
RoHS
R
O
NIC
INDU
S
TR
IES
For RoHS options
see page 21.
•
pe
U
rE
Positronic Industries
connectpositronic.com
TYPICAL MATING ASSEMBLIES
PICTURES ARE 80% OF ACTUAL SIZE
GMCT34F00RAZ0
GMCT26F0E100JB
GAP26MDS4T0000
GMCT34M0TWA00
CONNECTOR MATING DIMENSIONS
Male
Connector
Male Shell
0.772 [19.61]
0.732 [18.59]
P
0.850 [21.59]
0.790 [20.07]
Female
Connector
INSULATORS
PROTECTIVE SHELLS
Female Shell
P: 0.276 [7.01] MINIMUM PENETRATION OF MALE CONTACT
IN “CLOSED ENTRY” DESIGN FEMALE CONTACT TO
ENSURE MINIMUM CONTACT RESISTANCE.
DIMENSIONS ARE IN INCHES [MILLIMETERS].
ALL DIMENSIONS ARE SUBJECT TO CHANGE.
2
GMCT SERIES
S
tandard
D
ensity
R
ectangular
HEAVY-DUTY RECTANGULAR
CONNECTORS WITH
REMOVABLE CONTACTS
Positronic Industries
.connectpositronic.com
HEAVY-DUTY RECTANGULAR
CONNECTORS WITH
REMOVABLE CONTACTS
S
tandard
D
ensity
R
ectangular
GMCT SERIES
3
EXPLODED VIEWS OF TYPICAL MATED CONNECTOR ASSEMBLIES
GMCT14F0G000V
GMCT50M0000Y0
GMCT14M0G00JVLB
SET SCREW OPTIONAL
GAPL50F0T0LB
GMCT20F0E1PBJ0
GMCT20M0TUB00
GMCT34M00P0Z0
GMCT34F0T0000
Positronic Industries
connectpositronic.com
CONNECTOR COMPONENT DESCRIPTION AND TERMINOLOGY
A
-
Male and female contacts, size 16 and size 20. Power, signal
and shielded. Terminations are crimp, solder cup, wrap post,
printed board straight solder and press-fit.
B1
-
Unloaded connector insulators, male and female. Insulator
retention system retains all contact termination types.
Insulator may be used as a free or fixed connector.
B2
-
Loaded connector insulators, male and female. Insulators
may be preloaded per customer requirements with contacts
having terminations of 90° or straight solder printed board
mount, wrap post and press-fit. Insulator contact positions
may be selectively loaded with contacts. Unloaded insulator
contact positions remain unloaded and reserved for future
use. Connectors are normally fixed panel or printed board
connectors.
C1
-
Polarizing guides, male and female, ensure correct alignment
and coupling of male and female connectors. They may also
be used for keying when used in corner positions of connec-
tor variants 34, 42, 50, 60, 66, 75 and 104 poles.
C2
-
Fixed jackscrews are the stationary threaded members of the
jackscrew system. Threaded pilots and sockets of the
jackscrew system also provide connector polarization to
ensure correct connector coupling.
C3
-
Long turnable jackscrews, the rotating threaded members of
the jackscrew system, are used with a free connector having
a hood for cable support. Used on connector variants 9, 14,
18, 20, 21, 26 and 41 poles. Knobs, C-12, may be affixed to
turnable jackscrews using either roll pins or set screws.
C4
-
Short turnable jackscrews are used to polarize and mechani-
cally assist with the coupling of the male and female connec-
tors when the free connector is not equipped with a hood.
C5
-
Long turnable jackscrews, factory assembled to hood (cable
adapter) for polarization and mechanical assistance in the
coupling of the free connector to the fixed connector. Used on
connector variants with 34, 42, 50, 60, 66, 75 and 104 poles.
C6
-
Vibration locking system consists of lock tabs on fixed con-
nector and locking levers on free cable connectors. Normally
used on connector variants 7, 9, 14, 18, 20, 21 and 26 poles.
Locks connectors in coupled position.
C7
-
Hoods (cable adapters) are used on the free connector to pro-
vide cable support and contact protection. May also mechan-
ically support either the turnable or fixed members of the
jackscrew system.
C8
-
Side access hoods (cable adapters). Extra strength, quick
cable assembly to connector, fixed or free, to provide cable
support and relieve stress on contact termination. Supplied
with both turnable and fixed jackscrew systems.
C9
-
Shells (shrouds), both male and female, protect male and
female contacts from damage. Also used to provide addition-
al polarization combinations.
C10
-
Mounting plates, with or without float bushings, provide a
stronger mechanical method of mounting the fixed connector
to a panel. May be used with shells.
C11 -
Mounting angle brackets provide a means of mechanically
affixing the fixed connector to the printed board.
C12
-
Knobs of turnable jackscrews may be affixed to the
jackscrews by using either the roll pin or set screw method.
Specify method desired in step 9 of order numbering system.
INSULATOR DIMENSIONS
MATING FACE OF FEMALE CONNECTOR OR REAR FACE OF MALE CONNECTOR
1.312
[33.32]
1.000
[25.40]
0.375
[9.53]
1.250
[31.75]
0.938
[23.83]
0.438 0.562
[11.13] [14.27]
0.281
[7.14]
1.312
[33.32]
1.000
[25.40]
GMCT 9
0.188 [4.78]
GMCT 14
0.219 [5.56]
GMCT 18
2.000
[50.80]
1.688
[42.88]
1.625 [41.28]
1.562 [39.67]
1.250 [31.75]
0.562
[14.27] 0.281
[7.14]
0.219
[5.56]
1.312
[33.32]
0.750
[19.05]
0.375
[9.53]
0.438
[11.13]
0.468
[11.89]
GMCT 20
GMCT 26
0.234 [5.94]
GMCT 34
DIMENSIONS ARE IN INCHES [MILLIMETERS].
ALL DIMENSIONS ARE SUBJECT TO CHANGE.
4
GMCT SERIES
S
tandard
D
ensity
R
ectangular
HEAVY-DUTY RECTANGULAR
CONNECTORS WITH
REMOVABLE CONTACTS
Positronic Industries
.connectpositronic.com
HEAVY-DUTY RECTANGULAR
CONNECTORS WITH
REMOVABLE CONTACTS
INSULATOR DIMENSIONS
S
tandard
D
ensity
R
ectangular
GMCT SERIES
5
MATING FACE OF FEMALE CONNECTOR OR REAR FACE OF MALE CONNECTOR
2.312
[58.72]
2.625 [66.68]
2.312 [58.72]
0.438
[11.13] 0.219
[5.56]
0.750
[19.05]
0.468
[11.89]
2.000
[50.80]
0.234
0.375 [5.94]
[9.53]
GMCT 41
GMCT 42
2.718 [69.04]
2.594
[65.89]
2.282 [57.96]
2.750 [69.85]
2.375 [60.33]
0.750
[19.05]
0.234
0.875
[5.94]
[22.23]
1.531
[38.89]
0.468
[11.89]
0.438
[11.13]
0.766
[19.46]
0.875
[22.23]
GMCT 50
GMCT 60*
2.718 [69.04]
2.594 [65.89]
2.281 [57.94]
2.281
[57.94]
1.969
[50.00]
0.266
[6.76]
1.125
[28.56]
0.251
[6.38]
0.562
[14.28]
0.502
[12.75]
0.234
[5.94]
1.234
[31.34]
1.109
[28.17]
GMCT 66
GMCT 75
2.750 [69.85]
2.375 [60.33]
1.531
[38.89]
0.875
[22.23]
*CONTACT TECHNICAL SALES FOR U.L.
APPROVAL STATUS OF GMCT60 VARIANT.
0.438
[11.13]
0.766
[19.46]
MATERIAL: GLASS FILLED DIALLYL PHTHALATE PER
ASTM-D-5948 TYPE SDG-F
SEE GMCT SERIES PRINTED BOARD HOLE PATTERN PAGE
FOR CONNECTOR VARIANT CONTACT HOLE POSITIONS
GMCT 104
DIMENSIONS ARE IN INCHES [MILLIMETERS].
ALL DIMENSIONS ARE SUBJECT TO CHANGE.
Automotive Electronics
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