
HEAVY-DUTY RECTANGULAR
CONNECTORS WITH
REMOVABLE CONTACTS
Standard
Density
Rectangular
1
Positronic Industries
.connectpositronic.com
GMCT
SERIES
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.
UNDERWRITERS LABORATORY RECOGNIZED:
File No. E49351.
INTERNATIONAL STANDARDS:
IEC 807-7.
U.L. Recognized.
MATERIALS AND FINISHES:
Insulator:
Glass filled DAP per ASTM-D-5948 type
SDG-F.
Grey color is standard, black
available.
Removable Contacts:
Copper alloy, gold flash over nickel. Military
contacts plated 0.000050 inch [1.27 microns]
gold over copper. Other finishes available
upon request.
Hoods, Cable Adapters:
Aluminum with yellow or black anodize.
Shells:
Aluminum with yellow or black anodize.
Jackscrew System:
Passivated stainless steel.
Polarizing Guides:
Copper alloy with nickel plate or passi-
vated stainless steel.
Vibration Locks:
Copper alloy with zinc plate and chro-
mate seal.
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
mm2] through 28 AWG [0.08 mm2]. Also,
solder cup, press-fit, wrap post and sol-
der printed board terminations.
Also,
crimp and shielded contacts.
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
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.
Locking Systems:
Friction, vibration locks and jackscrews.
Polarization:
Polarized guides, polarized shells and
jackscrew system.
Mechanical Operations:
1000 operations per IEC 512-5.
Jackscrews:
Standard threads, 6-32 UNC on all
sizes, except 60 and 104 connector
variant, which uses 8-32 UNC. Metric
threads, M3X0.5 available.
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.
GMCT SERIES TECHNICAL CHARACTERISTICS
Size 16 and 20 Contacts
Connectors Qualified to
MIL-DTL-28748
Contacts Qualified to
SAE AS 39029
IEC Publication 807-7
U.L. Recognized,
Telecommunication
File #E49351
U.L. File #E140980
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EC
RoHS
Compliant
For RoHS options
see page 21.