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The Best Butt Connectors for Car, Boat & Other Applications

Written by Edwin Jones / Fact checked by Andrew Wright

best butt connectors

In the past, we’ve always used electrical tape to secure and insulate wires. But over time, these tapes tend to lose their effectiveness and relax their grip. This could potentially lead to problems in the future. That’s why butt connectors have been invented.

Butt connectors provide a prolonged and reliable connection while leaving a clean look to your electrical wiring. Having the best butt connectors that fit your needs will give you comfort and peace of mind. You know that your wiring is safe and will work well.

Butt connectors, also known as heat shrink connectors, are widely available in the market. If you ask many people, they will all come up with different answers for the best heat shrink connectors. The truth is, you can only say what the best is based on your experience.

There are many things to consider when purchasing a butt connector, but these are the three most important things to me.

  • Connector Materials: Whenever I purchase a butt connector, I look at the materials used for its construction.
  • Application: My choice for a butt connector will depend on my intended use. There’s no one-size-fits-all solution for these items.
  • Installation Process: It’s important for me to know what tools I need when installing connectors. Most require a heat gun, while others need a crimper, too. It’s crucial for me to know these so I know what I should bring from my truck into the job site.

There are a few more factors, but I will explain these in-depth later.

In the meantime, I’m going to share a list of butt connectors that I’ve previously used in my projects. I know it could be confusing to choose the right one with all the options out there, so I hope this list will help you know what’s available.


<strong>Top 1</strong>

Kuject Wire Connectors


No. of Pieces 120
Stud Size 26 – 10 AWG
Material PE, Tin

Jump to Review

<strong>Top 2</strong>

Sopoby Wire Connectors


No. of Pieces 120
Stud Size 26 – 10 AWG
Material Polyolefin, Solder

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<strong>Top 3</strong>

Ticonn Wire Connectors


No. of Pieces 250
Stud Size 22 – 10 AWG
Material PE, Cu

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Best Butt Connector Reviews

1. Kuject Solder Seal Wire Connectors

Soldering and crimping wires isn’t a worry when I have these heat shrink self-solder connectors. Users won’t have to master crimping or using solder iron with this product. It accomplishes this by including a soldering ring, activated via a heat gun that gives a solid and perfect connection.

The tube itself has an upgraded overheat resistance, preventing it from melting even when exposed to the heat gun. This ensures that the protection offered by the connectors isn’t compromised, even if you heat it for too long with the heat gun.

Meanwhile, the hot melt adhesive inside seals the connection between the two wires, thus rendering the link waterproof. This allows you to use this connector for external applications, like engine bay or outdoor wiring.

Furthermore, these waterproof wire connectors have multiple sizes in the box, ready to use for varying wire gauges from 26 to 10 AWG. It is great to have various sizes of connectors, especially when we don’t know which wire size we need to connect.

One downside with the thick insulated tubing is you need a relatively high-temperature heat gun to shrink it. While it does protect your wires better, it’s also a bother to install if you don’t have the right equipment.
  • Connects cables securely without soldering and crimping
  • Soldering ring provides excellent and stable connection
  • Heat resistant material prevents the tube from melting during heating
  • Hot-melt adhesive makes a waterproof, sealed connection
  • Comes in multiple sizes from 26 to 10 AWG
  • Thick tubing requires a high-temperature heat gun to shrink
I highly recommend these solder seal wire connectors for those who want to have a great product. However, you should have a high-temperature heat gun to install it perfectly and correctly.

2. Sopoby Solder and Seal Wire Connectors

This is a good choice for beginner DIYers who don’t have much experience. It has user guides on the cover of the box and excellent tips inside. This is very helpful, especially for new DIYers unfamiliar with wire connectors.

These connectors make a durable connection since the tubing shrinks to fit our cables. This feature allows them to be used in our home, vehicle, boat, or any electrical wiring, giving us flexibility in its application.

Furthermore, solder elements inside the connector melt and flow through the wire when heat is applied. This ensures a solid connection between our cables so we’ll have reliable electricity or signal flow through it.

It’s also RoHS, ISO, SGS-certified, and compliant with CE standards to assure users of their safety. The company also has excellent customer service, so you can reach out to their help centers should you have any questions or concerns.

The Sopoby Wire Connectors have excellent features. However, users need to move the heat gun around the solder instead of keeping it in one place. Otherwise, it’s very easy to ruin the heat shrink.
  • Includes an installation guide and tips in the box cover
  • Tubing securely shrinks onto cable upon installation for durability
  • Solder elements melt and flow through the wire for a stable connection
  • Broad compatibility; can be used in home and automotive applications
  • Complies with RoHS, ISO, SGS, and CE standards for safety
  • Excellent customer service
  • It’s easy to ruin the heat shrink if you don’t move the heat gun
This Sopoby wire connector has a helpful guide and excellent tips on its cover, making it perfect for beginners. It can help make our process smooth from start to finish.

3. Ticonn Heat Shrink Wire Connectors

The Ticonn wire connectors and terminals kit is a good option for installing or replacing terminals, no matter the type of wiring system. The terminals are made of copper, ensuring you get excellent current between your cables.

It also comes with different connectors, such as butt connectors, quick male disconnect, fork, and ring terminals that may fit every socket we have. In addition, its varying terminal sizes make it an excellent fit for every wire size we have in our electrical system.

Furthermore, these heat shrink wire connectors have insulated tubing with a 3:1 shrinkable ratio that allows you to have a high-quality seal. This feature ensures that your connections are sealed against environmental factors.

This item is also available in various combo sets. So, whether I need less than a hundred connectors for a small project or more than 500 for multiple assignments, I have options.

The only downside of this product is the loose storage box lock. It can easily open and scatter its contents if you accidentally drop it. It’s best if you secure the cover with a rubber band or tape to avoid the hassle of cleaning up.
  • Copper terminals give good electrical flow
  • Comes with butt connectors, male quick disconnect, fork and ring terminals
  • Included multiple sizes for use with various wire gauges
  • High-quality seal provided by the 3:1 shrinkable tubing
  • Available in multiple quantities to cover various needs
  • Storage box lock isn’t secure and will scatter contents if dropped
This is an excellent option to consider for installing or replacing electrical terminals. The connectors and terminals come in various sizes, ensuring users will only need one set for their project.

4. Haisstronica Heat Shrink Butt Connectors

These butt connectors are easy to use because of their recognizable design. Each connector size comes in its own color code, allowing us to get the correct one at a glance. This will enable us to work much quicker since we don’t have to identify each size manually when we pick out a connector.

The butt connector has a thick barrel, ensuring a solid grip after installation. It also has a built-in separator to ensure that both wires are aligned. These ensure that whatever splice you create will have a consistent connection. There’s no risk of your cables losing power because of loose contact.

Furthermore, the crimp connectors are made of tinned red copper, thus providing excellent electrical conduction for stability.

Plus, there are 48 white connectors for 26 to 24 AWG cables. This is perfect for those who work with delicate electronics, especially when connecting many small wires.

However, the installation of these connectors requires both a crimper and a heat blower. You have to install them properly, so make sure you have both on hand before starting your project.
  • Color coding makes it easy to recognize different sizes at a glance
  • Thick barrel ensures excellent grip
  • Built-in separators keep both wires aligned during installation
  • Tinned red copper wire connectors for superior conductivity
  • 48 pieces of white 26 to 24 AWG connectors, perfect for small electronics
  • Requires both a crimper and a heat gun for installation
This wire connector is recommended for working with small and delicate wires. It’s perfect for cables from 26 to 24 AWG. The only downside is it requires a crimping tool and a heat blower tool to install.

5. Qibaok Insulated Wire Butt Splice Connectors

The Qibaok Butt Splice Connectors are made with soft PVC insulation, making them capable of bending with your wire while maintaining durability. At the same time, they have an internal top brass conductor, ensuring efficient energy transfer while minimizing heat loss.

Furthermore, it has an operating temperature of -10 degrees Celcius up to 75 degrees Celsius, protecting your wiring in a wide variety of environments. This allows you to install this in your boat, which can be exposed to varying temperatures.

Another feature I like is the flared barrel that allows quick and easy wire installation. It ensures that the lines I prepared for splicing will slip in effortlessly while ensuring that they’re connected properly.

These connectors also have broad compatibility. They can be used both at home and in your automobiles, so you only need to purchase one box for use in both. I really appreciate how convenient this is.

The only downside I can see is some customers receiving boxes with no spacers. As a result, the connectors were mixed together, making usage more inconvenient. Fortunately, everything is color-coded, so I don’t consider this flaw a serious problem.
  • Made with soft PVC insulation, making them pliable while maintaining durability
  • Internal top brass conductor ensures efficient energy transfer and low heat loss
  • Flared barrel for easy wire insertion
  • Operating temperature of -10 to 75 degrees C protects wire in various environments
  • Compatible for use in both home and automotive applications
  • The box may arrive with no spacers
For shoppers who want to connect cables without affecting their flexibility, I highly recommend this product. It’s bendable and sturdy at the same time.

6. Airic Red Butt Connectors

For those who need to splice several thin wires, the Airic Red Butt Connectors will help them get the job done. These connectors are specially designed for linking cables from 22 up to 16 AWG. They’re perfect for small to medium-sized wires, especially those found inside vehicles and appliances.

The wire butt connector is made from top brass material with a tin-plated finish for superior connectivity. It also has a built-in wire stop to ensure that your wires are correctly inserted, thus ensuring that both lines are perfectly compressed. These features will give users confidence that their connection will remain stable, even after some time.

Furthermore, this product is approved and certified by UL and RoHS. This means it has been tested across various product safety standards–thus ensuring that our connections will not be a source of failure.

The only drawback for me is that I need to experiment to determine how much pressure these connectors can handle. But overall, this item is perfect for those who only want to purchase a refill for their stock of connectors.
  • Perfect for linking cables from 22 up to 16 AWG
  • Suitable for installation in vehicles and appliances
  • Made from top brass with a tin-plated finish for better connectivity
  • Wire-stop structure allows you to insert wires at the right place
  • Safety assurance through UL and RoHS certification
  • A little experimenting to determine how much pressure the connectors can take
This is an excellent product for those who work with appliances and other delicate electronics a lot. It’s also good if I want to refill my stock of butt connectors, since it has 100 pieces in one pack.

7. Ticonn Heat Shrink Wire Butt Connectors

This is the perfect butt connector for outdoor applications. It has a heat-activated adhesive lining that provides a 360-degree secure seal. That means I have a safe, watertight connection that can be placed outside, even underground. It’s also flame retardant, so I’m protected from overheating and fires.

Its thick copper barrel allows electricity to efficiently flow through it while reducing heat. It also even shrinks, ensuring a clean installation. This gives a pleasant and professional look to the splices we make.

Furthermore, you can quickly identify the wire connector’s size since it has a wire gauge imprint on it. The manufacturer also offers a 30-day money-back guarantee and a 24-months warranty. If their product does not perform as advertised, you can report it and avail of their money-back guarantee benefits.

One thing I noticed, though, is that the shrink tube seems thin. You need to be extra careful during installation to avoid damaging it. If you crimp it too hard or overheat it with your heat gun, you might cause a rip, leading to a short circuit in the future.
  • Heat-activated adhesive lining provides a 360-degree secure seal
  • Flame-retardant design
  • Thick copper barrel allows for efficient electrical flow with less heat
  • Evenly shrinks for a clean and professional installation
  • Wire gauge imprint for easy identification during use
  • 30-day money-back guarantee and 24-months warranty for peace of mind
  • Shrink tube is thin and may melt or rip if installation isn’t done carefully
For outdoor electrical wiring, this wire connector is an excellent choice. It has 360-degree protection, allowing us to use this product almost anywhere, even underground. Just remember to be extra careful in installation to prevent damaging it.

8. Qibaok Heat Shrink Butt Connectors

For anyone who’s a professional electrician or DIY expert with multiple projects like me, this Qibaok heat shrink connector is worth considering. Its large quantity of 660 high-quality wire connectors is enough to last users through several projects.

The smooth copper barrel architecture makes it durable, which provides excellent strain damage resistance. It also has a high elasticity see-through tubing that eliminates barrel opening and ensures stable performance.

What’s more, this product has an operating temperature range of -55 up to 125 degrees Celsius. You can thus use it across several applications, like in your automobile or outside your home.

Furthermore, the sizes are also easy to identify with their color coding and gauge imprint. With a single glance, you can confirm if the connector you’re holding is compatible with your installation.

The only bad thing I encountered about this product is that I received a damaged storage box. Although I don’t necessarily blame the maker, they could’ve packaged it better to avoid damage during shipment. They could also inform their carrier to take steps to prevent this from happening in the future.
  • 660 connectors in the package are more than enough for our electrical wiring needs
  • Designed with excellent strain resistance
  • High elasticity, see-through construction with stable performance; no barrel opening
  • Operating temperature range of -55 up to 125 degrees Celsius
  • Quickly identify the right size with color coding and wire gauge imprint
  • Better packaging for shipment is needed to avoid accidental courier damage
The large number of connectors one gets in a single purchase makes this an excellent choice for professionals. I recommend this for those who like NSPA connectors.

9. Haisstronica Heat Shrink Butt Connectors

The Haisstronica Connectors are an excellent choice for working across a wide range of projects. They’re designed for both marine and automotive applications. You can also use them for small to medium appliances, like stereos.

The product has a 0.8 mm high-quality copper core, which gives you a firm grip after crimping. This ensures that your connected wire will not loosen over time. The inner lining of the tube also features a hot melt adhesive, which provides watertight integrity for your connections.

The features of the Haisstronica Heat Shrink Butt Connectors have given me assurance that they will withstand the changing environments my car and boat experiences.

This heat shrink connectors marine item complies with all relevant product standards, such as RoHS, ISO, SGS, and CE standards. This means it has passed various safety tests, assuring users of its quality.

Although I don’t think it’s a downside per se, one package includes 200 pcs of 16 to 14 AWG connectors. It may be too much if you only need a couple of connectors. It would’ve been better if they also offered a pack that contains fewer pieces per size at a lower price.
  • Designed for both marine and automotive applications
  • Can also be used for small to medium appliances, like stereos
  • 8 mm high-quality copper core thickness, which gives a better wire grip
  • Inner tube lining features a hot melt adhesive for water integrity
  • Quality product assurance since it complies with all relevant product standards
  • Only one choice of quantity
This connector is recommended for those who work on various projects, like marine and automotive vehicles. It’s also waterproof, making it an excellent choice for installation in exposed areas.

10. Camtek Waterproof Wire Butt Connectors

The Camtek Butt Connectors are an excellent choice for working on automotive electrical wiring. It’s designed for 22 to 18 AWG cables, making it suitable for most onboard electronics, like headlights.

It has a shrinkage ratio of 3:1, which will give you a tight seal. It also shrinks at 80 degrees Celsius, so it will work without damaging the wire you’re installing it to. Furthermore, it has an internal hot-melt adhesive, ensuring that the wire splice you make is waterproof.

Because of these, I know that the electrical connections I’ve made are protected from environmental stresses they may encounter. I am confident that if I drive my car through rain and snow, my electrical installations will not fail.

The translucent design will also give you a clear sight of your cable splice, allowing you to see if it’s connected properly. It also allows for easy inspection to see if there is rust or other problems inside your connectors.

I just wish the manufacturer made the copper connector thicker. I have to crimp it tightly; otherwise, I won’t have a secure connection. Nevertheless, the other features of this connector make it an excellent choice for installing electronics.
  • Designed for 22 to 18 AWG cables, making it perfect for headlights
  • 3:1 shrink ratio will give a great seale for the connector
  • 80 degrees Celcius shrink point prevents damage to wires during installation
  • Internal hot-melt adhesive provides waterproofing to splice
  • Translucent cover design allows visual inspection of connection
  • Thin copper connector requires greater crimping force to ensure a secure connection
This is an excellent choice for working on electronics and other small appliances. It seals and protects our splice while ensuring that we can inspect it anytime through its translucent design.

11. Haisstronica Heat Shrink Butt Connectors

Adding vehicle electronics could be complicated if our accessories have different terminals. To address this, we can use the Haisstronica Butt Connectors pack.

It comes in a variety of eight various connectors, including spade connectors, compatible with 22 to 10 AWG cables. The heat shrink connector box also comes with at least 20 pcs per size, making it excellent for multiple projects.

Furthermore, the core connector is made of thick red copper for excellent conduction, with a tin-plated layer to prevent corrosion. It also conforms to the ABYC standard, ensuring that it’s sealed against the elements and has ideal salt and rust resistance. These features ensure that our connectors will last long, even if they’re exposed to the elements.

The double-walled heat shrink used in these connectors is tough and puncture-resistant. Haisstronica is confident of this feature, so much so that they offer a 30-day money-back guarantee and a 12-month replacement warranty.

However, despite the thick red copper terminals, I’m a little concerned they might be bent due to vibration. But so far, the connectors have had no problem.
  • Includes eight different connector sizes, with compatibility from 22 to 10 AWG lines
  • Comes with at least 20 pcs per connector, making it excellent for multiple projects
  • Thick red copper core for an excellent connection, with tin-plated layer to avoid rust
  • Meets ABYC standards, ensuring protection against the elements
  • Tough and puncture-resistant with a manufacturer guarantee and warranty
  • Possibility of being bent due to vibration
If I want to add accessories to my vehicle, I’ll go for these wire terminals and connectors. The 20 pcs that come per size make them excellent for working on multiple projects.

12. Plustool Waterproof Butt Connectors

It’s not recommended to use electrical tape to secure wire splices in automotive systems. This is because these tapes tend to lose their stickiness over time, causing them to come loose and expose your wiring.

That’s why I recommend the Plustool Butt Connectors for connecting 12 to 10 AWG cables with a high voltage rating. These connectors will stay secure and won’t come loose over time.

The copper connection inside their barrel ensures that current flow remains constant, with little resistance that could cause a voltage drop. Furthermore, its operating temperature of -55 to 125 degrees Celsius ensures that your system will not fail easily. Plus, the product’s also waterproof.

What I like best about this product is that it has multiple certifications from various industry standards. It gives me confidence, knowing the product I’m using has been tested by experts and has passed even the most stringent qualifications.

Given that this product is specially made for 12 – 10 AWG rated wires, it is not compatible with connecting wires of other sizes. Nevertheless, for heavy-duty applications, I recommend this option.
  • Will stay secure and won’t come loose over time
  • Designed for high-voltage automotive applications from 12 to 10 AWG
  • Copper connection ensures constant current flow to avoid voltage drops
  • Flexible operating temperature from -55 up to 125 degrees Celsius
  • A waterproof design
  • Guaranteed to have passed even the most stringent requirements
  • Only includes connectors for 12 to 10 AWG, not compatible with other wires
This is one of the best butt connectors for high-voltage applications. Its wide temperature operating range also ensures that we can use this in almost any application.

What to Look for When Buying Butt Connectors


Connector Material

What kind of material did the manufacturer use in the connector? Is it high-quality copper, brass, or lead solder that melts into the wire? If you’re splicing wires that don’t receive much movement or vibration (like a home circuit), then a lead solder would provide a good connection between the two.

On the other hand, if you’re installing your connectors in an automotive application, a copper connector provides excellent conductivity and longevity. However, you must crimp it tightly.

Brass connectors are also more substantial than copper, but they’re also marginally more expensive.

Area of Application

If I install the product inside my home or office, I don’t need to have butt connectors that can withstand harsh weather conditions. But if I have new electronics in my car or boat, I’m going to look for connectors specifically designed to withstand significant temperature fluctuations.

I also look for connectors with hot melt adhesive for outdoor installs. This ensures the splice will have waterproofing and avoid short circuits in the future.

Installation process

Some connectors require a crimper and a heat gun for installation, while others require only one of these. While I’m a professional and I have both tools at my disposal, if you’re a DIYer, check first if you have what is needed to install the connectors you’re going to purchase.


Since I’m a pro and keep these items in stock, I already have a case. I tend to order connectors that come in plastic bags, so I don’t get many extra plastic boxes. However, if you’re going to buy this for the first time, look for connectors with their own case so that you can keep them safely in your workshop.

Color Coding & Imprint

This is important if you want to work efficiently. Having color-coded connectors allows you to pick out the right-sized one at a glance. It’s going to be an added bonus to having the correct AWG size imprinted on the connector itself.

Do You Heat Shrink Butt Connectors

This is an excellent butt connector for high-voltage applications. Its wide temperature operating range also ensures that we can use this in almost any application.

It depends on what you bought. Most butt connectors come with a heat shrink designed to be heated by a heat gun for a secure install. You also need to do this to activate the hot-melt adhesive inside for a waterproof connection. Other butt connectors also come with lead solder inside to physically connect the two wires it links together.

However, some butt connectors require crimping only. These are made of PVC and aren’t designed to be heated. Check the packaging of your connector before applying any heat to it. If you heat a PVC connector, you might damage it.

How Do You Heat Shrink Butt Connectors with Solder

Most heat shrink connectors with lead solder require a high-temperature heat gun. You need this kind of heat gun to melt the solder inside while activating the heat shrink. If you don’t use a high-temperature heat gun, the lead solder might fail to melt, thus not connecting your cables.


Finding a reliable butt connector will give you comfort and peace of mind that your connected wires are safe and solid. It will also bring a nice look to your electrical wirings.

Also, remember the main things to consider when purchasing butt connectors. They will surely help you to find the best butt connectors for yourself.

5/5 - (4 votes)