Circular Connectors
MARC 53 Series Connectors
General Information
The MARC 53 Series
Connector family represents
a major advancement in the
design of high density (.080
[2.03] contact centers), sub-
miniature, power and coaxi-
al contact connectors. The
MARC 53 Series Connectors
consists of two connector
styles — the Military
approved MD53 featuring
shoulder entrapped con-
tacts, and the new RMD53
utilizing rear insertable/
removable contacts.
MARC 53 Series Connectors
combine positive lock —
the rugged, push-pull, lock-
coupling mechanism — with
the unique positive seal
multiple sealing system.
Positive lock is our new fin-
ger-tip, push-pull coupling
with the safety lock feature,
and is the only connector
made with positive “blind
mating” indication. When the
plug is fully engaged, the
coupling ring can be rotated
45° to the safety lock
position; if the plug is not
completely engaged, the
coupling ring cannot be
turned to the safety lock
position. Consequently,
under “blindmating” condi-
tions, it is always possible
to determine if the plug is
properly engaged without
visual reference, damage, or
accidental disengagement.
The environmental integrity
is guaranteed by multiple
seal construction using sili-
cone rubber “0” rings and a
floating, voidless insert con-
struction. The floating insert
design allows the inserts to
move within the connector
housing to control interfacial
sealing pressure in spite of
tolerance accumulation, and
a compression interfacial
seal with minimum engaging
force. Both the primary “0”
ring system and the contin-
uous dielectric construction
withstand the MIL-C-38300A
altitude breathing test. The
sealing system meets the
air leakage requirements of
not more than 1 cubic inch
of air per hour at a 30 P.S.l.
pressure differential. This
redundant sealing method
is indicative of the inherent
reliability built into our
connectors.
MARC 53 Series Connector
power contacts are manu-
factured from high grade
copper alloys, and are
designed to be crimped
with standard M22520
tooling using subminiature
contact locators.
MARC 53 Series Connectors
incorporate hard insulators
in both the plug and recep-
tacle inserts for exceptional
contact stability. Shoulder
entrapment positively
retains the front insertable
MD53 contacts between
the front and rear insulators.
The new RMD53 contacts
are rear insertable and
removable and are retained
within the connector insula-
tors by clips which can be
visually inspected. No inser-
tion or extraction tools are
required for either the MD53
or RMD53 contacts using
nominal size wire.
MARC 53 Series Connectors
are truly field serviceable…
no special tools are required
for maintainability. In addi-
tion, connector subcompo-
nents damaged through
handling or misuse can
be procured separately
generally without the need
to scrap entire connector
units.
Weight reductions as high
as 67% are achieved with-
out loss of performance.
MARC 53 Series Connectors
are available in both environ-
mental and hermetic styles.
In addition to the positive
lock plug, a threaded cou-
pling plug is also available.
Part numbers for configura-
tions offering various finishes
and accessories plus other
design variations to satisfy
special requirements are
also available.
MD53
shoulder entrapped contacts
RMD53
rear insertable contacts
Materials and Finishes
Housings and quick discon-
nect couplings are machined
from bar stock aluminum to
combine maximum strength
with minimum weight.
Threaded couplings are
machined from non-mag-
netic, stainless steel bar
stock for durability of the
coupling threads. Contacts
are manufactured from high
conductivity copper alloys
which have been selected
64
Catalog 1308638
Revised 8-05
www.tycoelectronics.com
Dimensions are in inches and
millimeters unless otherwise
specified. Values in brackets
are metric equivalents.
Dimensions are shown for
reference purposes only.
Specifications subject
to change.
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-5-729-0425
South America: 55-11-3611-1514
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
UK: 44-141-810-8967
for low contact resistance
over the operating range of
the connectors. Inserts are
molded from flame-resistant,
glass-filled diallyl phthalate,
meeting ASTM D5948
requirements. All resilient
parts are made of high-
temperature, silicone
elastomers. Fuel resistant
compounds are used
where swelling affects the
performance of the
connector. All materials are
selected for their non-
magnetic properties.
The standard finish is hard
black, non-conductive,
anodized finish on connector
housings and quick discon-
nect couplings; stainless
steel threaded coupling is
passivated with black oxide
finish. Conductive finish
modifications include gold
finish and electroless nickel
finish. Multi-finish modifica-
tions for connector plugs
include black anodized
disconnect coupling with
conductive finish on shell
grounding members.
Contacts are gold plated
per MIL-G-45204 require-
ments. See Page 73 for
modification information.
Circular Connectors
MARC 53 Series Connectors
(Continued)
Service and Performance
Data
I. Electrical
— Electrical Ratings
Contact
Size
22 AWG
16 AWG
1
Current Rating
(Amperes,
Max., 81°F [+27°C])
5
20
Dielectric
Withstanding
Voltage (RMS)
1000
1000
Working Voltage
110,000
1
Sea
Ft. Alt.
Level
750
300
750
300
Contact
Resistance
(Millivolts, Max.)
15
20
10,000 ft equals 33,528 m altitude.
Wire Sizes Accommodated
Contact
Size
22 AWG
16 AWG
1
Cond. Dia.
(Stranded)
1
.019-.032
[.483-.813]
.038-.061
[.965-1.55]
Jacket
Size
2
.039-.054
[.991-1.37]
065-.081
[1.65-2.05]
Tolerance of conductor diameters required for a reliable crimp. Smaller sizes
readily accommodated — consult Tyco Electronics.
2
Smaller jacketed cable can be accommodated but environmental seal
may be impaired. Smooth extruded jacket should be used for consistent
wire sealing.
Insulation Resistance: 5000 megohms, minimum, at room ambient conditions.
II. Mechanical
— Durability: 500 Cycles Mate/Unmate.
Coupling/Uncoupling Forces and Tightening Torques:
Shell
Size
9
12
15
18
Coupling/
Uncoupling
Force
(In-Lbs.) Max.
18 [80.07 N]
22 [97.86 N]
27 [120.10 N]
32 [142.34 N]
Tightening Torque (In-Lbs.)
Retaining Nut
Mounting Nut
20 [2.26 Nm], Max.
20 [2.26 Nm], Max.
20 [2.26 Nm], Max.
20 [2.26 Nm], Max.
30-45 [3.39 – 5.08 Nm]
40-55 [4.52 – 6.21 Nm]
55-70 [6.21 – 7.91 Nm]
70-85 [7.91 – 9.60 Nm]
Circular
Connectors
Operating Temperature: -67°F to 257°F [-55°C to +125°C]
Connector Mated Length: MD Plug (06) mated to MD Receptacles (00) (01)
(02) (12): 2.031 [51.58], max. RMD Plug (06) mated to RMD Receptacles:
2.217 [56.31], max.
3
65
Catalog 1308638
Revised 8-05
www.tycoelectronics.com
Dimensions are in inches and
millimeters unless otherwise
specified. Values in brackets
are metric equivalents.
Dimensions are shown for
reference purposes only.
Specifications subject
to change.
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-5-729-0425
South America: 55-11-3611-1514
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
UK: 44-141-810-8967
Circular Connectors
MARC 53 Series Connectors
(Continued)
Test Data
MARC 53 Series Connectors exceed the requirements of specification MIL-C-38300A (USAF) as detailed in the applicable
M38300A (USAF) military specification sheets.
MARC 53 Series Connectors meet the following selected test parameters as specified below:
DESCRIPTION
MIL-C-38300 Test Para
Contact Retention
Para. 4.10.3
TEST REQUIREMENTS
MD Contacts shall withstand 15 lbs [66.72 N] axial load and RMD contacts
10 lbs [44.48 N] axial load without axial displacement in excess of 0.012 [.305]
or damage to contacts or inserts when the axial load is applied to the mating
end of the contacts in unmated plugs and receptacles at a rate of approximately
1 lb/sec. [4.45 N].
The potential drop across normally mated contacts shall not exceed 25 mv
under room ambient and high temperature service conditions when measured
as specified in MIL-C-26636, Fig. 2, with maximum rated current.
No evidence of dielectric breakdown or flashover when mated and unmated
plugs are subjected to 645 and 180 volts RMS, respectively, at altitudes up to
110,000 feet [33,528 m] and 1000 volts RMS at sea level.
Insulation resistance of mated plugs and receptacles shall be 5000 megohms,
minimum, at room temperature and 1000 megohms, minimum, at 257°F
[+125°C] when measured per MIL-STD-202, Method 302, Test Condition B.
Plugs and receptacles shall withstand up to 500 cycles of engagement and
separation (locking mechanism actuated with each cycle) without detrimental
damage to plugs or receptacles or not satisfying subsequent tests of MIL-C-38300.
Mating and unmating forces shall not exceed 27 Ibs, [120.10 N] maximum,
(15 shell size) after fully wired plugs and receptacles are immersed for 20 hours,
each, in hydraulic fluid (MIL-H-5606) and high temperature lubricating oil
(MIL-L-9236) followed by a one-hour dry.
Mated connectors shall show no circuit interruptions greater than one microsec-
ond during 12 hours vibration to include six sweeps in each axis at extreme
temperatures of -85°F [-65°C] and 257°F [+125°C] per MIL-STD-202, Method
204, Test Condition D. Post inspection shall show no detrimental cracking,
breaking, or loosening of parts.
The insulation resistance of mated connectors shall exceed 1000 megohms
after subjection to moisture resistance testing per MIL-STD-202, Method 106, as
amended by MIL-C-38300.
The insulation resistance of wired and mated connectors shall be 5000
megohms, minimum, and there shall be no flashover or breakdown at a test
voltage of 1000 volts RMS after the third cycle and while immersed in 5% salt
water solution at 68°F [20°C] and room ambient pressure pressure at 68°F
[20°C].
Unmated plugs and receptacles shall show no excessive corrosion which
would detrimentally affect the electrical and mechanical performance of the
connectors after subjection to 24 hours exposure to salt spray atmosphere per
MlL-STD-202, Method 101.
Contact Resistance
Para. 4.10.8
Dielectric Withstanding Voltage,
Altitude and Sea Level
Para. 4.10.10
Insulation Resistance,
Room and High Temp.
Para. 4.10.13 and 4.10.13.1
Coupling and Uncoupling
Para. 4.11.3
Fluid Immersion
Para. 4.11.5
Sweep Vibration, Mated
Para. 4.11.6
Moisture Resistance
Para. 4.11.8
Altitude Breathing
Para. 4.11.12
Salt Spray
Para. 4.11.13
66
Catalog 1308638
Revised 8-05
www.tycoelectronics.com
Dimensions are in inches and
millimeters unless otherwise
specified. Values in brackets
are metric equivalents.
Dimensions are shown for
reference purposes only.
Specifications subject
to change.
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-5-729-0425
South America: 55-11-3611-1514
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
UK: 44-141-810-8967
Circular Connectors
MARC 53 Series Connectors
(Continued)
Contact Arrangements
1,2
Shell Size 9
Shell Size 12
Shell Size 15
Shell Size 18
6
Insert Arrangement
3
Number of Contacts
Contact Size
9-19
4,5
19
22 AWG
12-37
4,5
37
22 AWG
Shell Size 15
15-31
5
31
16 AWG
Shell Size 15
18-91
4,5
91
22 AWG
Shell Size 15
Shell Size 9
Insert Arrangement
3
Number of Contacts
Contact Size
9-7
5
7
16 AWG
1
2
15-61
4,5
61
22 AWG
15-55
55
22-20 AWG
15-43
1-95 ohm
42-22 AWG
Views shown are front face view of receptacles. Front face view of plugs is mirror image of that shown.
In addition to those inserts shown, MARC 43 Series Connector inserts may be utilized in MARC 53 Series Connector
housings. See page 63, MARC 43 Series Connector modifications.
3
Arrow ( ) indicates insert top or vertical position in relation to top or vertical position of connector housings.
4
Arrangement also available in RMD style.
5
Arrangement also available in hermetic seal receptacles.
6
Arrangement available in 06, 00, 01.
Circular
Connectors
Part Number and
Ordering Information
MARC 53 Series Connector
part numbers indicate size,
shape, insert layout, type of
seal, style of contact and
polarization.
Note:
Pin or socket (power
or coaxial) contacts may be
used in either plugs or
receptacles. However, it is
recommended that pins be
placed in the receptacles
when possible to take
advantage of our “scoop-
proof” design.
Alternate Keying
— Standard
alternate polarizing key
positions are shown below.
Additional polarizing key-
ways are available upon
request.
Supplemental Accessory
Hardware
— We also manu-
facture supplemental acces-
sory hardware (protective
covers, shield adapters,
etc.) to adapt these connec-
tors to almost any applica-
tion. For modifications to fit
your requirements, contact
Tyco Electronics.
3
Typical Part Number
MD53
06
E
15
61
S
N
(***)
Modification
Designator
when applicable
(See page 73)
Series — MD53
or RMD53 style
Single hole mntng.
receptacle
Line cord recept.
Box mntng. recpt.
Straight plug,
positive lock quick
disconnect
Box mntng. recept., thd
Straight plug,
threaded coupling
00
Polarizing position
N, 1, 2, 3, 4, etc.
P — Pin, Power Pin, Coaxial Pin
S — Socket, Power Socket, Coaxial Socket
NOTE: If P or S does not appear in the
numbering system, no contacts will be
supplied with order (order separately)
Insert arrangement number
Shell Size — O.D. of receptacle
barrel to nearest .063 [1.60]
E — Environmentally sealed
H — Hermetic seal (receptacle only).
01
02
06
12
16
67
Catalog 1308638
Revised 8-05
www.tycoelectronics.com
Dimensions are in inches and
millimeters unless otherwise
specified. Values in brackets
are metric equivalents.
Dimensions are shown for
reference purposes only.
Specifications subject
to change.
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-5-729-0425
South America: 55-11-3611-1514
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
UK: 44-141-810-8967
Circular Connectors
MARC 53 Series Connectors
(Continued)
Polarizing Key Positions
All of our multi-pin plugs
and receptacles are avail-
able in alternate polarizing
positions as listed below:
Y
X
X
(1)
(1)
Y
Plug
(Shell sizes 9, 12, 15 only)
Shell Size 9
Part No.
(R) MD53-***9-***-N
(R) MD53-***9-***-1
(R) MD53-***9-***-2
(R) MD53-***9-***-3
(R) MD53-***9-***-4
(R) MD53-***9-***-5
Receptacle
(Shell sizes 9, 12, 15 only)
X°
130
130
90
210
130
90
Y°
110
150
110
110
35
230
Shell Size 12
X°
Part No.
(R) MD53-***12-***-N 130
(R) MD53-***12-***-1 130
(R) MD53-***12-***-2 130
(R) MD53-***12-***-3 105
(R) MD53-***12-***-4 155
(R) MD53-***12-***-5 80
(R) MD53-***12-***-6 190
(R) MD53-***12-***-7 130
(R) MD53-***12-***-8 215
(R) MD53-***12-***-9 80
(R) MD53-***12-***-10 130
Y°
110
90
145
110
110
110
110
170
110
230
30
Shell Size 15
Part No.
X°
(R) MD53-***15-***-N 130
(R) MD53-***15-***-1 130
(R) MD53-***15-***-2 130
(R) MD53-***15-***-3 130
(R) MD53-***15-***-4 190
(R) MD53-***15-***-5 150
(R) MD53-***15-***-6 90
(R) MD53-***15-***-7 70
(R) MD53-***15-***-8 70
(R) MD53-***15-***-9 90
(R) MD53-***15-***-10 210
(R) MD53-***15-***-11 30
(R) MD53-***15-***-12 250
(R) MD53-***15-***-13 130
(R) MD53-***15-***-14 30
(1)
Y°
110
90
150
170
110
110
110
110
230
230
110
110
30
30
230
(1)
A
A
E
B
B
E
C
D
C
D
Plug
(Shell size 18 only)
Shell Size 18
B°
A°
60
130
70
130
55
130
50
130
125
75
80
150
50
90
120
70
130
70
35
90
140
75
Receptacle
(Shell size 18 only)
Part No.
(R) MD53-***18-***-N
(R) MD53-***18-***-1
(R) MD53-***18-***-2
(R) MD53-***18-***-3
(R) MD53-***18-***-4
(R) MD53-***18-***-5
(R) MD53-***18-***-6
(R) MD53-***18-***-7
(R) MD53-***18-***-8
(R) MD53-***18-***-9
(R) MD53-***18-***-10
C°
185
205
210
190
190
205
175
175
205
130
210
D°
250
270
250
235
250
250
250
250
260
215
250
E°
325
320
310
305
320
300
315
295
325
285
310
(1)
Arrow ( ) indicates top or vertical position (master key/keyway) and coincides with top or vertical position of insert
shown on page 59. This relationship remains constant with alternate polarizing key positions.
(R) Rear insertable and removable.
68
Catalog 1308638
Revised 8-05
www.tycoelectronics.com
Dimensions are in inches and
millimeters unless otherwise
specified. Values in brackets
are metric equivalents.
Dimensions are shown for
reference purposes only.
Specifications subject
to change.
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-5-729-0425
South America: 55-11-3611-1514
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
UK: 44-141-810-8967
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