M SERIES CONNECTORS
RATCHET COUPLING
®
®
Introduction
This catalogue gives the complete description of LEMO M series connectors. M series connectors are lightweight triple-
start ratchet coupling type connectors designed for avionics, aerospace, military, security, motorsport and heavy duty appli-
cations.
The LEMO manufacturing programme has been extended to almost 40 series divided into 7 product families with specific
mating and environmental characteristics. Each series includes a wide variety of plug, socket and coupler models, avail-
able in contact configurations adapted to all round cables. Watertight models are also available. Since LEMO connectors
are perfectly screened and designed to guarantee very low resistance to shell electrical continuity, they are particularly adapted
to applications where electromagnetic compatibility (EMC) is important.
Technical Characteristics
Materials and Treatments
Component
Shell
material code
X
Outer shell
Conical nut
Earthing crown
Coupling nut
Ratchet
Hexagonal nut
Male crimp contact
Female crimp contact
Clips
Insulator
O-ring and gaskets
Sealing resin
Cable rear seal
Spring
C
Brass (UNS C 38500)
Aluminium alloy (AA 6262A or AA 6023)
Brass (UNS C 38500)
Aluminium alloy (AA 6262A or AA 6023)
Bronze (UNS C 54400) or special brass
Brass (UNS C 38500)
Aluminium alloy (AA 6262A or AA 6023)
Special PEEK
Brass (UNS C 38500)
Aluminium alloy (AA 6262A or AA 6023)
Brass (UNS C 34500)
Bronze (UNS C 54400)
Cu-Be or special steel
PEEK
FPM/FKM (Viton
®
)
Epoxy (Araldite
®
or Stycast
®
)
Fluorosilicone
Stainless steel
Material (Standard)
Surface treatment (µm)
Notes
chrome
nickel
gold
Cu Ni Cr Cu Ni Cu Ni Au
0.5
–
0.5
–
–
–
–
–
–
–
3
–
3
–
–
–
–
–
–
–
0.3
–
0.3
–
–
–
–
5
–
–
–
–
anodized
–
–
– 0.5
– 0.5 3
–
– 0.5 3
–
– 0.5 3
–
– 0.5 3
–
anodized natural
–
–
– 0.5
–
–
– 0.5
without treatment
–
–
–
–
–
–
–
–
–
–
–
–
–
3
3
–
–
–
1.5
–
–
–
–
1.0
1.5
1)
Notes:
standards for surface treatment are as follows: chrome-plated FS QQ-C-320B; nickel-plated FS QQ-N-290A or MIL-C-26074C; gold-plated ISO
4523.
1)
anthracite colour.
Environmental performance
Characteristics
Operating temperature (mated)
Ingress protection index
Fungus
Flammability
Fluid contamination
1)
Sand and dust
2)
Lightning strike
Altitude-low temp
3)
Salt fog
4)
Thermal shock
Altitude immersion
Air leakage
5)
Humidity
Value
- 55°C/+200° C
IP 68 (at 2 m, 15 hr)
Satisfied - by material analysis
60 sec. front and back face
Fuels, gasoline, hydraulic oils, solvents, de-icing
6 hr, 55°C, blowing < 150 µm dust
10 K amps - 6 times
-65°C; 40’000 feet and 400 VAC
Alum. shell (slight pitting after 48h), Brass shell (500h)
5 cycles : -65° C to +150° C
No moisture on contacts
< 10
-7
mbar. l/sec (Helium)
21 days at 95%
IEC international
MIL-spec tests
IEC 60529
MIL-STD 810F-508.5
EIA-364-104A
MIL-STD-810F method 504
MIL-STD 810F-510.4
EIA-364-75
EIA-364-105A
EIA-364-26
EIA-364-32 test condition IV
EIA-364-03
MIL-STD-1344 method 1008.1
EIA-364-31 method IV
IEC 60512-6 test 11f
IEC 60512-11-4
IEC 60512-7 14 b
IEC 60068-2
Note:
1)
Connectors immersed at both 70°C and 25°C according to specification. Connectors are then inspected, no visual signs of damage seen.
Fuels: Kerosene, JP4, (Nato F40) at 70°C +/- 2°C. Gasoline: ASTM 4814. Hydraulic oils: Mineral oil based MIL-H-5606.
Solvents: Isopropanol. De-icing fluids: 25% ethylene glycol.
2)
No signs of damage, connectors opened and closed without difficulty. Dust or sand was not inside connector.
3)
Wired mated connectors = no voltage breakdown, shell to all contacts (connected together) w/400 VAC after 1 hour at 65° C
at 40’000 feet altitude.
4)
Corrosion resistance. Inspection: salt deposits shall be removed by gentle wash in running water with light brushing using soft brush.
Aluminium Shell (material code: X) max: 96 hours. Brass shell (material code: C) over 500 hours.
5)
Only for vacuumtight model (HE•)
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®
Electrical performance
Characteristics
Insulation resist. (at ambient temp.)
6)
Dielectric withstanding volt. (sea level)
Contact resistance
Current rating
Shell to shell conductivity
Shielding effectiveness, low frequency
Shielding effectiveness, high frequency
Value
> 10
12
Ω,
> 10
10
Ω
(after humidity)
See table page 16-17
See table below
7)
See insulator configuration page 16-17
< 1.5 mΩ
≥
80 dB up to 1GHz
≥
70 dB (3GHz),
≥
58 dB (6GHz),
≥
40 dB (10GHz)
IEC international
IEC 60512-2 test 3a
IEC 60512-2 test 4a
IEC 60512-2 test 2a
IEC 60512-3 test 5a
IEC 60512-2-6
MIL-spec tests
EIA-364-21
EIA-364-20
EIA-364-06
EIA-364-83
EIA-364-66
EIA-364-66
Note:
6)
After humidity test: 21 days at 95% RH according to IEC 60068-2. Insulation resistance measured between the contacts and contact/shell.
Contact resistance
7)
IEC 60512-2 test 2a
0.5
≤
8.7
0.7
0.9
1.3
Value
øA
(mm)
mΩ
Notes:
7)
after 5000 mating cycles and the salt spray test according to IEC 60512-6 test 11 f.
≤
6.1
≤
4.8
≤
3.6
Mechanical performance
Characteristics
Value
3000 cycles (1000 cycles for 5M series)
25 to 2000 Hz, 3 axis (Apache helicopter)
30 g, 3 axis, 12 hr
50-2000 Hz, 37.8 g rms-3 axes; 4h amb
300 g - 3 msec
50 g acceleration
> 22 N (ø 0.7mm), > 30N (ø 0.9 mm)
See table below
IEC international
IEC 60512-5 test 9a
MIL-spec tests
EIA-364-09
MIL-STD-810F method 519.5
MIL-STD-202 method 204-G
EIA-364-28 test cond. V letter I
EIA-364-27 condition D
MIL-STD-1344 - 2011-1, A
Endurance
Gunfire vibration
Vibration-Sine
8)
Vibration-Random
Shock
Acceleration
Contact retention
Torque
IEC 60512-6-4
IEC 60512-6-3
IEC 60512-8 test 15a
Note:
8)
Amplitude: 30G. Frequency: 10 to 2000 Hz. Time per axis: 4 hours (X, Y, Z). No signal discontinuity above 1 µs.
Series
0M
1M
2M
3M
Coupling torque
tightning (N.cm)
4
10
20
34
Coupling torque
untightning (N.cm)
5
11
14
29
Series
TM
4M
LM
5M
Coupling torque
tightning (N.cm)
tbc
26
48
91
9)
Coupling torque
untightning (N.cm)
tbc
25
43
54
Note:
9)
Higher value due to very high contact density
2
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®
®
M Series
The M Series connector offers a new innovative design for avionics, aerospace, military, security, motorsport and
heavy duty applications.
Made of high-strength aluminium, this connector is one of the lightest and most compact of the LEMO product line.
A one-grip ratchet screw system enables quick and secure coupling of the connectors. The arctic grip makes it easy
to manipulate the connector while wearing gloves or when the connector is located in a difficult to access area.
Features
– Ratchet-coupling mechanism
– Compact design for space savings
– Oil and fuel resistant
– 360° screening for full EMC shielding
– Colour coding / keying
– Scoop proof
– Threaded for MIL-DTL-38999L backshell
– Quick mating: less than 3/4 turn to seat
– Lightweight
– High vibration and shock resistance
– Sealed to IP68 when mated
– Reverse sex configuration
– Pin configuration from 2 to 114 contacts
Metal housing models
(page 5)
Straight plugs
Fixed sockets
Free sockets
FM
EG
PB
PV
PM
FM
EG
PV
PM
PB
FM
EC
PV
PH
PB
FG
EC
PF
PH
FG
ED
PE
PF
Watertight model
(unmated)
Fixed socket
FG
ED
HE
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