All You Need to Know About MC4 Crimping Tool


A crimper or MC4 connector crimping tool is a common tool that is used for creating solderless contacts in as well as outside the workshop. They are known as crimp pliers or wire crimpers. As the simple crimping tools resemble the common pliers to some extent this is the reason it is called a crimpling plier. The purpose of the crimper is to join the two metallic ends either cable to cable or connector to the end of a table.

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Types of MC4 Connector Crimping Tools

Different kinds of crimpers are available in the market. Here are few types of crimpers

  • Crimpers might be plain for a single contact at a time or might be complex multi-function types. Crimping tools handle the connectors of several types like RJ, RF, BNC, telephone, D-sub, DIN, etc.


  • Multifunction crimping tools are responsible for combining the crimping function with functions of wire strippers, or wire cutters.


  • Some of the crimpers might have die and anvil for the thick wires. The workpiece is held between the die and anvil and in order to form a crimp the die is hammered.


  • There is one more type i.e. ratcheting crimpers. These crimpers hold the workpiece and until a threshold pressure is applied, they do not release the workpiece. To release prematurely, a safety mechanism might be available for the operator.

Moreover, the ratcheting crimpers can have the provision for the interchangeable dies. This allows to operator to use the same tool to crimp connectors of different sizes as well as types.

Steps to Use MC4 Crimp tool

The method of operation depends on the tool chosen as well as the job. Assuming the basic crimping tool, here are the steps that you can follow to attach a connector to the wire

  • Get a connector and the wire as required. It is important to note that a connector cannot be reused.
  • Strip an appropriate length at the wire end. The length would depend on the size as well as the type of terminal and the thickness of the wire.
  • Ensure that the connector as well as wire are clean at the point where they would mate.
  • Insert the wire in the connector’s barrel. The end of the wire needs to come in line with the barrel’s terminal end.
  • Place the connector and wire in the crimper’s jaws. After ensuring that the wire and terminal are positioned correctly with respect to each other as well as crimper jaws, apply pressure.

After applying, release the jaws and inspect the quality.


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