The notch crimp: well-tried and tested

The notch crimp is the oldest and presumably also the original best-known crimp profile in the electrotechnology sector. It is still used in control cabinet construction to 1 kV today. It is set apart by a deep point-specific deformation of the cable lug. However, it is suitable only for processing copper. The deep point-specific deformation may also be why it has fallen out of favour somewhat with the experts, and is being gradually replaced by the generally established hexagonal crimp. Wrongly so, or so we think.

Multi-purpose in two variants

In practice, there are two different types of notch crimp: the conventional notch crimp and the two-point indent crimp. Our notching tools are capable of crimps with cross-sections of up to 400 mm². The two variants have the same effect and have identical properties. All notch crimps are special crimps, which are most suitable for fine and superfine-stranded conductors in order to produce durable and reliable connections. However, they are also able to reliably connect multi-stranded conductors.


The notch crimp can be used to process a broad range of conductors: from Class 2 multi-stranded copper conductors to DIN EN 60228 to Class 5 and 6 fine and superfine stranded types. It must of course be ensured that the appropriate cable lug is used. From a technical perspective, the notch crimp is set apart mainly by its high degree of compaction. However, be aware that notching causes high material stress, resulting from the strong force applied during the crimping process. Therefore, it is important that high-quality connectors are used and the connection is stress-relieved.

The number of notches required is the same as with a narrow hexagonal crimp.

Still useable

In summary, we can say that the notch crimp is a useful, standards-compliant crimping method – primarily for cross-sections below 6 mm², but also in control cabinet construction to 1 kV. Never discount the notch crimp – always permitted and efficient as well.

There is no doubt, however, that the acceptance of the notch crimp among experts isn't what it once was. It is therefore important with concrete projects to clarify with customers in advance as to whether they allow notching in their technical facilities and plants.

Klauke tools for notch crimping:

> K2 Crimping tool, 0,75 - 16 mm² 

> K02 Crimping tool for solid conductors, 0,75 - 16 mm² 

> K5/K5SP Crimping tools 6 - 50 mm² 

> K8/K8SP Crimping tools 35 - 95 mm² 

> K6/K6SP Crimping tools 50 -120 mm² 

> K7/K07SP Crimping tools 120 - 240 mm² 

> K07/K07SP Crimping tools 185 - 400 mm²