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Electrical contact
Technical description
The secure reliable electromechanical connection achieved
with LEMO female cylindrical contacts is mainly due to
two important design features :
1. Prod proof entry on the mating side which ensures per-
fect concentric mating even with carelessly handled con-
nectors.
2. The pressure spring , with good elasticity, maintains a
constant even force on the male contact when mated. The
leading edge of the pressure spring preserves the sur-
face treatment (gold-plated) and prevents undue wear.
Contact material and treatment
LEMO female contacts are made of bronze beryllium (QQ-
C-530) or bronze (UNS C 54400). These materials are cho-
sen because of their high modulus of elasticity, their excel-
lent electrical conductivity and a high mechanical strength.
LEMO male solder and print contacts are made of brass (UNS
C 38500). Male crimp contacts are made of brass (UNS
C 34500) or annealed brass (UNS C 38500) with optimum
hardness (HV) for crimping onto the wire.
Au
Type
Material (standard)
Surf. treatment (μm)
Cu Ni Au 1)
Ni
Cu
Bronze
or brass
Male crimp
Male print
Female crimp
Female print
Clips
Connection wire 2)
Brass (UNS C 34500)
Brass (UNS C 38500)
Brass (UNS C 38500)
Bronze (UNS C 54400)
Cu-Be (FS QQ-C-530)
Cu-Be (FS QQ-C-530)
Stainless steel
Brass
0.5
0.5
–
–
3
3
–
3 3)
1.0
1.5
–
–
Notes: the standard surface treatment are as follows:
– nickel: FS QQ-N-290A or MIL DTL 32119
– gold: ISO 27874.
1) minimum value
2) for elbow print contacts
3) treatment completed by 6 μm Sn (lead free) tin-plating
Thickness comparison between the outside
and the inside of female contacts
Gold thickness
2.5
P
Contact
?A
(mm)
0.5
male
(μm)
1.0
female
outside inside
(μm) (%)
1.5
65
2.5
Note: P = inspection point
P
0.7
0.9
1.3
1.6
2.0
3.0
4.0
5.0
6.0
8.0
12.0 1)
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
–
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
–
70
75
75
75
75
75
75
75
75
75
–
Notes: 1) contacts are silver plated
176
www.lemo.com
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