Northern Connectors Harting DIN 41 612 Connectors - Manual (Page 32)

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Terminations
Crimp terminals
A perfect crimp connection is gastight and therefore corrosion free. It is
equivalent to a cold weld of the connected parts. For this reason, major
features in achieving high quality crimp connections are the design of
the crimping areas of the contact and of course the crimping tool it self.
Wires to be connected must be carefully matched to the correct size
of crimp contacts. If these basic requirements are met, users will be
assured of highly reliable connections with a low contact resistance
and a high resistance against corrosion.
The economical and technical advantages are:
●
Constant contact resistance as a result of an unvariable crimp
connection quality
●
Corrosion free connections as a result of cold weld action
●
Preparation of harnessing with crimp contacts already fitted
● More economic cable connection
Requirements for crimp connections are set out in DIN IEC 60 352-2.
Pull out force of stranded wire
The main criterion by which to judge the quality of a crimp connection
is the retention force achieved by the wire conductor in the terminal
section of the contact. DIN IEC 60 352, part 2, defines the extraction
force in relation to the cross-section of the conductor. When fitted using
HARTING crimping tools and subject to their utilization in an approved
manner, our crimp connectors comply with the required extraction
forces.
Crimping tools
Crimping tools (hand operated or automatic) are carefully designed to
guarantee a symmetrical deformation of the crimping area of the
contact and the wire through the high pressure forming parts of the
tool. The locator automatically engages the crimp contact and the wire
at the correct point in the tool. The wire insulation can also be included
as a secondary feature of some crimp contacts to care for additional
mechanical strength.
The ratchet in the tool performs 2 functions:
➀ It prevents insertion of the crimp into the tool for crimping before
the jaws are fully open
➁ It prevents the tool from being opened before the crimping action
is completed
A quality crimp connection can be achieved with this crimping system.
The adjacent sketches show important features of the HARTING hand
crimping tool.
The HARTING automatic crimping tool uses bandoliered contacts.
The machine strips insulation from the wire and then crimps the contact.
Both the crimping area and the insulation support are independently
adjustable to facilitate the use of any wire type with dimensions within
the stated crimp capacity.
Crimp cross-section
Locator
Wire gauge (mm²)
Tensile strength of crimped connections
Conductor cross-section Tensile strength
mm² AWG N
0.05 30 6
0.08 28 11
0.12 26 15
0.14 18
0.22 24 28
0.25 32
0.32 22 40
0.5 20 60
0.75 85
0.82 18 90
1.0 108
1.3 16 135
1.5 150
2.1 14 200
2.5 230
3.3 12 275
4.0 310
5.3 10 355
6.0 360
8.4 8 370
10.0 380
Extract from DIN IEC 60 352-2, Amend. 2, table IV