®
®
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
Surface treatment (µm)
nickel
Shell
material code
Component
Material (Standard)
Notes
chrome
gold
I
X
ꢀ
C
I
X
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
l
l
Brass (UNS C 38500)
0.3
–
–
–
–
–
Outer shell
Conical nut
1)
1)
lꢀ
ꢀ
l
ꢀ
Aluminium alloy (AA 6262A or AA 6023)
Brass (UNS C 38500)
14
–
5
–
5
–
3
3
0.3
–
–
lꢀ
lꢀ
ꢀ
l
lꢀ
ꢀ
Aluminium alloy (AA 6262A or AA 6023)
Bronze (UNS C 54400) or special brass
Brass (UNS C 38500)
14
–
–
Earthing crown
Coupling nut
Ratchet
l
l
–
1.5
–
–
–
–
1)
lꢀ
lꢀ
ꢀ
l
lꢀ
ꢀ
Aluminium alloy (AA 6262A or AA 6023)
Special PEEK
–
14
–
l
l
–
Brass (UNS C 38500)
–
–
–
–
–
–
–
–
3
5
–
–
–
Hexagonal nut
lꢀ
l
Aluminium alloy (AA 6262A or AA 6023)
Brass (UNS C 34500)
–
Male crimp contact
Female crimp contact
Clips
1.0
1.5
–
–
lꢀ
lꢀ
lꢀ
lꢀ
ꢀ
lꢀ
lꢀ
lꢀ
lꢀ
ꢀ
l
l
l
l
l
Bronze (UNS C 54400)
Cu-Be or special steel
PEEK
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
without treatment
–
–
–
–
–
–
Insulator
Silicone
O-ring
lꢀ
lꢀ
lꢀ
lꢀ
l
FPM/FKM (Viton®)
lꢀ
lꢀ
lꢀ
l
l
l
Epoxy (Araldite® or Stycast®)
Fluorosilicone
Sealing resin
Cable rear seal
Spring
Stainless steel
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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