Product Profiles

Parts Bin: NTE Self-Solder Butt Splice Connectors



Making a splice in a vehicle’s automotive wiring is a critical task, because you’ve got to ensure there’s a solid electrical and mechanical connection that will withstand the vibration and temperature extremes found in automotive environments.

Often, these splices must occur in tight spaces where there’s limited access to the wires, which can compound the difficulty.

NTE Heat Shrink Self-Solder Butt Connectors eliminate many headaches. You needn’t know how to solder or crimp in order to create a high-quality splice. All you’ll need is a heat gun and wire stripper.


The splice connectors come in several sizes, suitable for a range of common automotive wire gauges. (Image/Summit Racing)

These clever connectors are essentially heat shrink tubes with pre-installed low-temperature solder hoops. Simply push your stripped, stranded wire ends together, slip one of these connectors over the joint, and hit it with a heat gun for a few moments.

The heat will melt the low-temp solder between the stranded wires to create a solid electrical connection, while simultaneously contracting the heat-shrink tubing to reinforce the joint and make a weatherproof shield over the splice.

They’re a smart solution for anyone who’s making several wire connections and wanting to speed-up the process.

Better still, the foolproof design of these connectors can eliminate many issues caused by faulty connections as a result of moisture ingress and physical strain/vibration.

NTE makes these connectors in a range of American Wire Gauge (AWG) sizes, ranging from 26 AWG (thinner wire) down to 10 AWG (larger wire).

NOTE: Remember, if you’re ordering online, the higher the AWG number, the smaller the wire diameter. 

Here’s a video that demonstrates how they work and how to install them.

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  1. Why not make all wire ends ( eyes,spades,etc) like this?

    • While these butt splice connectors are handy in a lot of applications, the main drawback is that they’re permanent. So, if you had an electrical component that you need to remove occasionally (CB radio, for instance) male/female spade terminals might be a better choice. Ring terminals (eyes) are also very useful for securing a wire end to a panel like a firewall or inner fender for grounding applications.
      So it boils down into using different splice connectors for different jobs.

  2. Ken Schemmel says:

    Are you a electrician ? I held a Chicago Contractors license in Chicago! What did you do and where are these made? Solder will fail morethen climp any day!

    • Hey Ken, there was quite a soldering vs. crimping debate on Facebook when we posted this, and several folks from the military and the aviation sectors commented that soldering was perfectly acceptable in their industry, and a few said that they used connectors very similar to these NTE ones listed in the story above.

      In fact, check out this in-depth NASA Technical Standard guide on soldering. Even in NASA’s Crimping, Interconnecting Cables, Harnesses, and Wiring Guide there are sections specifically on using “Heat Shrinkable Soldering Sleeves” on page 55 and again on page 83.

      While most automotive applications are relatively low voltage (<18 Vdc), this spec sheet from NTE says these are good to 600 volts. Hope this clears things up a bit–73s.

    • Solder will fail if it is a cold solder joint. The NTE solder butt splices are, when applied correctly, provides an air tight connection thus no cold solder joints. I am an Airframe and Powerplant tech and use these on a daily basis but ours are FAA approved parts.

    • I’ve used these for years working for Nissan they haven’t failed yet…

  3. Solder joints are for connection only. Not for strength. These look like they would be used for a lot of solutions. A lot of people don’t know how to solder properly so these would be great solution for good connections.

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