How to Connect a BNC to a Coaxial Cable

Written by jeremiah blanchard
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How to Connect a BNC to a Coaxial Cable
Audio and video transmission can be done using coax and a BNC connector. (computer cables image by timur1970 from

A Bayonet Neill-Concelman connector, otherwise known as a BNC connector is generally used on coaxial cable. This connector processes serial digital and analogue frequencies commonly for video transmissions, but is also used for audio transmissions as well. The connectors are often used in home or commercial video surveillance installations. Connecting a BNC connector to a coaxial cable involves stripping the coaxial cable and can be done using a few special cable cutting and crimping tools.

Skill level:

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Things you need

  • Crimping tool
  • Stripping tool
  • Strain relief boot
  • Ferrule
  • Center pin
  • BNC body

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  1. 1

    Slide the strain relief boot onto the coaxial cable. Ensure that the wide part of the strain relief is closest to the designated BNC end.

  2. 2

    Slide the BNC ferrule onto the cable.

  3. 3

    Place the stripping tool one inch from the designated BNC end. Rotate the stripping tool about 6 or 7 times around the cable to strip it.

  4. 4

    Pull off the stripped black plastic coating, then bend down the metallic mesh braiding away from around the white coax core.

  5. 5

    Slide the BNC centre pin onto the protruding copper coax pin, then crimp it on using the crimping tool.

  6. 6

    Slide the BNC body onto the white coax core--with the wide part facing away from the cable--and push down hard. Ensure that the BNC centre pin is centred in the BNC body, and not protruding from the BNC rim.

  7. 7

    Slide the ferrule up onto the BNC connector. This action will push the mesh braiding in between the ferrule and the BNC body. Ensure that the mesh braiding is between the ferrule and the BNC connector, then use the crimping tool to crimp the ferrule tight.

  8. 8

    Slide the strain relief boot up over the ferrule then twist it clockwise. This will protect the ferrule and the BNC connection.

Tips and warnings

  • You can purchase twist on BNC connectors if you don't have a crimping tool to use. This makes the installation easier for some.
  • Combination crimping and stripping tools are usually available to purchase rather than purchasing both separately.
  • Ensure that the connection is tight and secure before hooking the cable up to any video or audio equipment. If too much tension is applied to the cable, and the BNC is not tight, the connector will slip off of the cable.

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