How to Crimp a RJ45 Plug

Written by james scott
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How to Crimp a RJ45 Plug
RJ45 plugs are used to connect network devices. (Goodshoot/Goodshoot/Getty Images)

Off the shelf Ethernet cables never seem to be the right length. Crimping your own RJ45 plugs will allow you to create cable lengths specific to your needs. RJ45 is a modular connection used primarily in networking. The connector is used to terminate UTP cable such as CAT5, CAT5e or CAT6. Depending on the wiring standard, the twisted pair wire will need to be arranged in a specific manner before being inserted into the RJ45 plug.

Skill level:
Moderately Easy

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Things you need

  • UTP cable
  • Wire cutters
  • Wire stripper
  • RJ45 crimper

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Instructions

  1. 1

    Cut the cable to the required length. Strip 1 inch of jacketing off of the cable, exposing the twisted pair wires.

  2. 2

    Untwist the paired wires and separate them. If your cable is a CAT6 you will need to remove the plastic spine. Hold the wires out of the way and cut the spine off as close to the jacket as possible.

  3. 3

    Straighten the wires and arrange them in the colour order specific to your application. Hold the wires flat with your thumb and forefinger. Cut the wires to a length of 1/2 inch, making sure they are even.

  4. 4

    Grasp the RJ45 plug clip side down. Firmly push the wires into the plug, ensuring the wires slide into the grooves inside the plug. Look through the end of the plug to ensure that the wires are fully seated.

  5. 5

    Insert the RJ45 plug into the crimper. Squeeze the handles of the crimper firmly.

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