Crimp Style CCTV Connectors
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Crimp on Style CCTV Connectors are very common, when installed correctly provide years of service, the biggest issue with these connectors is the installer gets a few strands of the shielding in contact with the center pin which causes distortion in the picture and if the cables are not tested as each connector is installed trouble can be abound and it is always harder to trouble shoot a cable run after it is installed and causes much more labour. Take the time to install them correctly.

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Installing Crimp Style BNC connectors to RG59 cabling

BNC connection CCTV RG59 cable termination

Tools required: Side cutters, needle nose pliers, X-acto knife, a cable stripper and a BNC crimper.

The stripper is required because the different bands in the coax cable have to be cut precisely to different lengths and depths, and this is difficult to do without the proper tool.

The BNC Crimper is used twice in the process - first to crimp the BNC pin to the main conductor, and then to crimp the collar over the outer insulation at the end of the operation. A quality crimper can make the difference between a connection that works and one that has to be discarded.

It is also a good idea to make a length of test cable and try it out between a couple of computers on the system before actually going through the trouble of pulling cable through wall and ceiling spaces. You don't want to do all that hard work only to find you've got the wrong cabling! The connector itself consists of three parts: the connector itself, the center pin, and the crimp barrel.

STEP 1: PREPARE CABLE

Prepare the end of the cable with the cable stripper tool. Leave yourself a few extra feet of cable length for mistakes. If you get a bad connector, you'll be able to cut it off and try again.

Setting up the cable stripper may require some trial and error adjustment.

Leave about 1/4 inch of cable sticking out the front of the stripper. You then rotate the stripper about the cable until the two layers of insulation and the shielding are cut through to their proper depths.

The center conductor is about 1/2 inch long (it will be cut to fit). The exposed portion of the inner insulation band is about 1/8 inch and the braided shielding between the two insulation bands has been cut back cleanly to the same length as the outer insulation band.

If the cable stripper does not completely do its job, you may have to clean up the cable end with an X-acto knife or needle file. Care counts here. The center conductor should not be nicked, nor should any of the braided shielding be exposed - the most difficult part of this operation is to strip the shielding without damaging the inner insulation band.

STEP 2: CRIMP PIN

Fit the center pin from the connector package over the center conductor as far as it will go. The resulting length of exposed center conductor is the amount of conductor that will have to be cut off for a proper fit. Take the pin back off and cut the center conductor to the correct length with side cutter pliers. It should be 3/16 inch plus or minus. Now when the pin is placed back on the conductor, its base should just reach the inner insulation band (the center conductor should no longer be exposed.)

Place the pin on the center conductor, snug up the crimping tool over the pin (in the special die portion of the crimper provided for the pin) . . . and when you're absolutely sure everything is properly aligned, crimp the pin to the center conductor. Be careful. If this is messed up, you have to start over prepping the cable again with a new connector. Have a few more connectors on hand, even though you'll get good at this, mistakes are made, and if you don't have enough you'll put a real time strain on your project. You will use them!

The base of the pin is seated on the top of the inner insulation band. The crimping process flattens out the pin a bit where the crimping tool applies pressure to it. Clean up any sharp edges left by the crimper with a jeweller’s file, if necessary.

STEP 3: INSTALL BNC CONNECTOR

Slide the Crimp Barrel (or collar) over the cable before installing the connector itself - we will come back to the crimp barrel in the next step, but you have to slide it onto the cable now (you can't force it over the much larger connector later).

You must insert the connector unto the cable. The knurled cylinder portion fits over the pin and inner insulation band and is press-fitted-twisted into place. It has to fit snugly between the outer and inner insulation bands, and during the process, it fights with the braided shielding for this tight space.

When you think you've got the connector inserted under the insulation as far as it will go, push it a little farther. You'll know you're finished when most of the knurled surface has disappeared under the insulation and the center pin is rigid in its seated location inside the connector. If the pin is loose and the connector is on as far as it will go, the length of exposed inner insulation band when the cable was stripped is too short. If the pin is tight but a lot of the knurled portion of the connector is still showing, the length of exposed inner insulation band and/or center conductor when the cable was prepared is too long.

STEP 4: CRIMP BARREL

You're almost done. Now slide the crimp barrel (placed on the cable at the beginning of the last step) up as close to the connector as you can get it.

It will take some effort to get as much of it as possible over the bulge in the cable caused by the last step.

If you have a general-purpose wire stripper/crimper, it has an "ignition terminals" opening that is a little bigger than the cable and a little smaller than the crimp barrel. This is a great tool for putting some leverage behind the crimp barrel when easing it over the bulge in the cable.

Now you can crimp the barrel using the other, larger opening in the BNC crimp tool die. This will tighten and deform the crimp barrel down over the connector and cable for a secure connection.

Crimping the barrel should force the bulge in the cable up over what remains of the exposed knurled portion of the connector to the connector's base. Now you can install another connector on the other end, and then test the completed length of cable. It is good practice to test each length of cable as you go rather than install all the connectors and cabling, and then try to track down a bad connection. With a little practice you will be installing the BNC connectors like a pro.
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