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
applications.
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, available
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
I
l
X
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
C
l
Material (Standard)
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
Silicone
FPM/FKM (Viton
®
)
Epoxy (Araldite
®
or Stycast
®
)
Fluorosilicone
Stainless steel
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Surface treatment (µm)
nickel
chrome
gold
I
X
0.3
–
0.3
–
–
–
–
–
14
–
14
–
–
14
–
3
5
–
–
–
–
1.0
1.5
–
–
–
5
–
5
–
3
3
–
–
–
–
1.5
–
–
–
1)
1)
1)
Notes
Outer shell
Conical nut
Earthing crown
Coupling nut
Ratchet
Hexagonal nut
Male crimp contact
Female crimp contact
Clips
Insulator
O-ring
Sealing resin
Cable rear seal
Spring
l
l
l
l
l
l
l
l
l
without treatment
l
l
l
l
Notes:
standards for surface treatment are as follows: chrome-plated SAE AMS 2460; nickel-plated SAE AMS QQ N 290 or MIL DTL 32119; gold-plated
ISO 27874.
1)
anthracite colour.
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1
®
®
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
Humidity
Value
-55°C/+200°C (HE
l
model: -20°C/+80°C)
IP 68 (at 2 m, 15Hr)
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 (up to 500Hr), Brass shell (1000Hr)
5 cycles: -65°C to +150°C
No moisture on contacts
21 days at 95%
IEC 60068-2
IEC 60512-6 test 11f
IEC 60512-11-4
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
EIA-364-31 method IV
IEC international
MIL-spec tests
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: 48 hours, (material code: I) max: 500 hours. Brass shell (material code: C) over 1000 hours.
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 25, 26, 27
See table below
7)
See insulator configuration page 25, 26, 27
< 1.5m Ω
≥ 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
EIA-364-83
EIA-364-66
EIA-364-66
MIL-spec tests
EIA-364-21
EIA-364-20
EIA-364-06
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
2
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®
®
Mechanical performance
Characteristics
Endurance
Gunfire vibration
Vibration-Sine
8)
Vibration-Random
Shock
Acceleration
Contact retention
Torque
3000 cycles
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 60512-8 test 15a
IEC 60512-6-4
IEC 60512-6-3
Value
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
Note:
8)
Amplitude: 30G. Frequency: 10 to 2000 Hz. Time per axis: 4 hours (X, Y, Z). No signal discontinuity above 1 µs.
Series
MM
0M
1M
2M
3M
Coupling torque
tightning (N.cm)
8
4
10
20
34
Coupling torque
untightning (N.cm)
4
5
11
14
29
Series
TM
4M
LM
5M
Coupling torque
tightning (N.cm)
26
26
48
9)
91
9)
Coupling torque
untightning (N.cm)
30
25
43
54
Note:
9)
Higher contact density = larger torque force.
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3
