Lemo's B & S Series Connectors - LEMO - (Version JPG) - Page n° 10 - PDF Catalogue | Technical Documentation

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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 perfect concentric mating even with carelessly handled connectors; and

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 surface treatment (gold-plated) and prevents undue wear.

-TT 1

Contact Material and Treatment

LEMO female contacts are made of bronze beryllium (QQ-C-530) or bronze (UNS C 54400). These materials are chosen because of their high modulus of elasticity, their excellent electrical conductivity and a high mechanical strength.

LEMO male solder and printed circuit 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.

Ni Cu


Type	Material (standard)	Surf. treatment (\|m)
Type	Material (standard)	Cu Ni \| Au¹⁾
Male crimp	Brass (UNS C 34500)
Male crimp	Brass (UNS C 38500)	0.5	3	1.0
Male printed circuit	Brass (UNS C 38500)
Female crimp	Bronze (UNS C 54400)	0.5	3	1.5
Female printed circuit	Cu-Be (FS QQ-C-530)	0.5	3	1.5
Clips	Cu-Be (FS QQ-C-530)
Clips	Stainless steel
Wire²⁾	Brass	-	3³⁾	-

Bronze or brass

Notes: The standard surface treatment are as follows: Nickel: FS QQ-N-290A or MIL-C-26074C; and Gold: ISO 4523.

¹⁾ Minimum value ²⁾ For elbow printed circuit contacts ³⁾ Treatment completed by 6 |jm Sn-Pb tin-plating

Thickness comparison between the outside and the inside of female contacts


Contact 0 A (mm)	Gold thickness
	male (\|Jm)	female
	male (\|Jm)	outside (\|m)	inside (%)
0.5	1.0	1.5	65
0.7	1.0	1.5	70
0.9	1.0	1.5	75
1.3	1.0	1.5	75
1.6	1.0	1.5	75
2.0	1.0	1.5	75
3.0	1.0	1.5	75
4.0	1.0	1.5	75
5.0	1.0	1.5	75
6.0	1.0	1.5	75
8.0	1.0	1.5	75
12.0¹⁾	-	-	-

2.5

^—m

2.5

Note: A = inspection point

Notes: ¹⁾ Contacts are silver plated.

Data Subject to Change 8 LEMO USA • 800-444-5366 • www.lemousa.com

Lemo's B & S Series Connectors - LEMO - #10

Circular connector, Video cable, Cable harness, Electrical cable, Power supply cable