A flaring tool is a special hand or hydraulic tool that helps you shape the end of a pipe or tube into a flare. This flared end lets you connect that pipe securely to another one without leaks. It’s commonly used in plumbing, HVAC work, automotive brake systems, and refrigeration. Whether you’re working with soft copper, aluminum, or steel tubing, a flaring tool is super handy when you need tight, leak-free connections.
What Does a Flaring Tool Do?
A flaring tool helps you expand or “flare” the end of a metal tube. This flare is a cone-shaped widening at the pipe’s tip. When you attach the flared end to a fitting with a matching cone shape and tighten it with a nut, it creates a very tight seal. That seal is strong enough to handle high pressure and resist leaks, even with gas or refrigerants flowing through the pipe.
For example, if you’re installing a copper line for an air conditioner, you’ll need an HVAC flaring tool to flare the tubing before attaching it to the unit. Likewise, if you’re repairing a brake line on your car, a brake line flaring tool will let you reshape the line so it fits with the connectors.
Why You Might Need a Flaring Tool
You might need a flaring tool if you ever work with metal tubing and need leak-proof, high-pressure connections. These tools are especially useful in:
- HVAC installations – like when setting up air conditioning lines
- Automotive repairs – like fixing or installing brake lines
- Plumbing systems – especially when dealing with copper piping
- Refrigeration systems – to join pipes carrying coolant
- DIY projects – if you’re working with tubing for home or garage use
The flaring tool helps you get professional results even if you’re not a pro. It saves money because you can do your own repairs instead of hiring a technician, and it adds to your skillset.
Types of Flaring Tools
Not all flaring tools are built the same. There are different types depending on what kind of job you’re doing and how much effort you want to put in. Let’s look at the main types of flaring tools.
Manual Flaring Tool
The manual flaring tool is the most common type. It usually includes a clamp (also called a bar) to hold the pipe in place and a cone that you twist into the end of the tube. This cone pushes the metal outward, forming a flare. Manual flaring tools are great for simple, low-volume jobs. They’re cheap, lightweight, and don’t need power or oil.
If you’re working on a small plumbing job or need a pipe flaring tool for home repairs, the manual one should do just fine. Look for a model that comes as a flare tool kit with all the fittings and dies you need.
Hydraulic Flaring Tool
Hydraulic flaring tools are designed for professional or heavy-duty use. They use hydraulic pressure instead of your hand strength to push the cone into the tubing. That makes it much easier to flare hard materials or large-diameter tubing. If you’re working on lots of brake lines or doing regular HVAC work, this tool will save you tons of time and effort.
This kind of flaring tool works well as a copper pipe flaring tool and is also commonly used in auto shops. It gives more accurate and clean flares with less physical strain.
Single vs. Double Flare Tool
A single flare tool creates just one outward flare at the end of the tube. It’s faster and simpler but not always as strong. A double flare tool makes two folds in the tubing, which creates a more durable connection that can handle higher pressure.
Double flares are especially common for brake line repairs where safety is critical. If you’re working with steel lines, especially in cars, you’ll definitely want a double flare tool. It reduces the chance of the flare cracking under pressure.
What Materials Work With Flaring Tools?
Flaring tools are designed for use with soft metal tubing. The most common materials that work well with these tools include:
- Copper – Often used in HVAC, plumbing, and refrigeration
- Aluminum – Lightweight and corrosion-resistant
- Soft steel – Used in brake and fuel lines
- Brass – Durable and easy to flare
- Stainless steel – Requires a strong tool like a hydraulic flaring tool
It’s important to know that not all flaring tools can handle all materials. For example, stainless steel needs a tougher tool, like a hydraulic one. If you’re flaring softer copper for HVAC or plumbing, a manual tool usually does the job well.
How to Use a Flaring Tool (Step-by-Step)
Using a flaring tool the right way is key to getting a good, leak-free connection. Here’s a simple step-by-step guide anyone can follow:
- Cut the Tubing – Use a proper tubing cutter to get a clean, straight cut. Avoid using a hacksaw, which can leave jagged edges.
- Deburr the Inside – Use a deburring tool to remove any sharp edges inside the pipe. This step is important because rough edges can crack during flaring.
- Insert the Pipe into the Clamp – Place the pipe in the correct-size hole of the flaring bar, leaving just the right amount sticking out (usually about the height of a dime).
- Tighten the Clamp – Make sure the pipe is held firmly in place so it doesn’t move.
- Place the Cone in the Pipe – Line up the flaring cone or press with the pipe’s end.
- Twist or Pump – If it’s manual, twist the handle until the flare is formed. If it’s hydraulic, pump the handle until the flare is done.
- Inspect the Flare – Look for a smooth, even flare. No cracks, splits, or uneven edges.
Once done, your pipe is ready to be joined with a flare nut and fitting!
Things to Check Before You Start
Before you begin using a flaring tool, take a moment to double-check these important details. Skipping this step could lead to a bad flare and cause leaks or even equipment damage.
Common Mistakes to Avoid
Some people rush into using a flaring tool and make small mistakes that cause big problems. Let’s go over the common ones:
Don’t Flare Dirty Pipes
Make sure your pipe is clean. Dirt, grease, or rust on the pipe’s surface can ruin the flare and prevent a tight seal. Always clean the pipe with a cloth before starting.
Wrong Size Clamp
Each pipe has a specific outer diameter (OD), and your clamp should match that size. If you use the wrong-size hole in the clamp, your flare will be crooked or loose. Always double-check that the pipe fits snugly in the tool before flaring.
Best Places to Buy a Flaring Tool in the USA
If you’re looking for where to buy the best flaring tool in the USA, you’ve got many great options. Local hardware stores like Home Depot, Lowe’s, or Ace Hardware often carry manual and basic flare tool kits. For more professional-grade tools like a hydraulic flaring tool, check out Grainger, Harbor Freight, or Tooltopia.
Online platforms like Amazon, eBay, or Acme Tools offer a wide variety and often better pricing. Make sure to read the reviews and check if the tool comes with all the accessories like flare nuts, dies, and cases. Search for keywords like “flare tool for copper tubing,” “HVAC flare tool kit,” or “double flare brake line kit” to find what suits your job.
The Bottom Line
A flaring tool is one of those tools you never think about until you need it—then it becomes essential. Whether you’re a plumber, car mechanic, HVAC technician, or just a DIY enthusiast, learning how to use a flaring tool opens the door to doing clean, professional, and safe tubing connections.
They’re simple to use once you get the hang of it. From HVAC to automotive, from plumbing to refrigeration—flaring tools make your work stronger, cleaner, and safer. And with the right tool and some patience, you’ll get perfect flares every time.
