Making An Insulated Terminal Connection
This is a double crimp ratchet tool for use with insulated terminals that are non-heat shrink. When crimping an insulated terminal with a double crimper it is important to note the direction of the terminal. The "open end" or the end you feed the wire into should always face the colored dots! The reason for this is simply that the dies are not symmetrical. The end where the colored dot is crimps the strain relief portion of the terminal and the other side crimps the barrel and wire creating a cold formed crimp.
Again, when using this ANCOR double ratchet crimper the ring, spade or quick disconnect side of the terminal should ALWAYS be on the right side of the crimper jaws and the wire should ALWAYS be on the left side! If you make a crimp, from the wrong side of the crimping tool, the crimp will not be as strong and may fail! Other double crimp tools may be different so check with you manufacturer for instructions. The side with the smallest crimped ID is the one to crimp the bare wire end.
WARNING: Double crimp tools are UNIDIRECTIONAL! If you crimp the terminal backwards it will pull out far to easily and pose a safety risk. The strain relief ID is far larger than the crimp barrel ID so please DO NOT CRIMP backwards. Many readers have complained that their double crimp tools don't work well, and some cheap ones may not. I always explain that they are unidirectional and they write back to say they now work fine.
WARNING: The original Ancor double crimp tool I tested here works admirably well and represented a decent value. Unfortunately, I recently had my hands on a current model of the same tool and it is not the same in terms of performance.
I can only suspect a vendor change caused this? I would suggest considering a Pro's Kit
tool and purchasing the dies for it. They represent a good value in a mid quality tool.
Anatomy of an Insulated Terminal
I took apart an insulated terminal to show why the crimper is referred to as double crimper. If your non-heat shrink insulated crimps do not have three parts find some that do. AMP calls these terminals PIDG connectors. This particular terminal is a Molex.
The spade gets one crimp (left side of photo) and the strain relief barrel (middle of the photo) gets a second crimp where I have scuffed the metal. The "colored dot" side of the jaws, of the "double" crimper, are the appropriate size for crimping this strain relief barrel. Using the appropriate crimper such as the "double crimper" pictured above will create both crimps in one single motion.
If I were to disassemble a heat shrink connector all you'd see is the heat shrink and the terminal. You'd only have two pieces, not three, hence the term "single crimp" as it only crimps the crimp barrel because there is no strain relief barrel on a heat shrink terminal.
Unfortunately, there are two separate tools because there are two different types of insulated connectors!
Double Crimps For Insulated Terminals
This picture shows where the two crimps are placed when using standard insulated three-piece crimp terminals. This is an AMP PIDG terminal.
In The Double Crimp Jaws
One other important thing to consider is the orientation of the terminal. The terminal should always be oriented so the the split in the barrel is facing the top jaw of the double crimper. Just as there is a right and left to the dies there is also a top and bottom..
This photo shows a fairly even crimp taking place. Guillotine style tools, which come together vertically make for much more repeatable performance. Scissor style tools work but require more attention on your part..You can also see the difference between the top and bottom jaw dies that are closest to you and the ones at the far side of the crimping tool too. It is important to note that the wires should stick out the end of the terminal about 1/16" inch before you make the crimp.
A finished insulated crimped terminal made with the "Ancor Double Ratcheting Tool". As with adhesive lined heat shrink connectors you should avoid the use of a "dimple crimper" on an insulated terminal. This crimp tool makes an "okay" crimp but not one that is equal to something that would be allowed in the aeronautical world. That being said it still passes the Mil-Spec tensile strength load requirements...
Here you can see the "double" part of the double crimp. Both the barrel and the strain relief have been crimped thus the term "double crimper".
Double crimping dies are not intended to be used on adhesive lined heat shrink terminals. These dies are not machined as smoothly as the dies on the single ratcheting crimper I used above and could possibly rip the adhesive lined heat shrink.
Checking The Strength
In the sailing & boating community I often find skepticism surrounding crimped terminals so I wanted to do a little experiment to display the strength of a properly executed crimp.
To do this I used the crimp you just saw being made. The wire used is 12ga UL Listed tinned marine grade wire. This photo shows the crimped butt connector holding the entire weight of two of my anchors. The static load here is close to 70 lbs. on that crimped connector.
The Full Picture
This experiment was not done using special effects or trick photography and you can see that the anchors were not just resting on the floor...
This picture sums it all up. A well executed crimp is very strong.
I got bored with the excitement level of just two anchors and decided to up the ante & try it with four anchors. Shown here is a Rocna 33, Spade A-80 (16lbs.), Super Max 35 and a Fortress FX-16 (10 Lbs.).
Yes, you read it correctly, that crimped connector is supporting close to 95lbs.
FOR THE FULL CRIMP TOOL SHOOT OUT VISIT MY FORUM AND SEE THE VIDEOS AT THE LINK BELOW:
Another Test This Time With NO CRIMP
OK I wanted to test the strength of the adhesive lined heat shrink to decipher it's added benefit in overall total joint strength.
To do this I striped the wire as I would normally do then instead of crimping the butt connector I simply applied heat and melted the adhesive lined heat shrink around the wires jacket.
This photo shows the actual connection that I used in the photo below.
The Results !
I was quite impressed by the durability of just the adhesive lined heat shrink tubing.
The heat shrink alone actually held my 10lb Fortress FX-16 anchor just fine. I then tried my 16 lb. Spade A-80 anchor and the connection failed before I could even turn around and get my camera! Still ten pounds is not bad and it should certainly keep any moisture out. Interestingly enough a yellow terminal crimped with the "el-cheapo" crimpers from the first picture held less than ten pounds in my load testing. Based on that the adhesive is stronger than a cheapo pair of crimpers.... Ouch!!
So the failure point is somewhere between 10 and 16 lbs. static load, for just the heat shrink alone.