Quick Answer: The Yellow Jacket 60278 is the best flaring tool for HVAC copper and mini-split lines thanks to its self-centering yoke and broad 1/8 inch to 3/4 inch range, while the TGR Professional is our pick for brake line work, and the Capri Tools CP21110-316 is the best compact budget option for occasional 3/16 inch repairs.
I have been testing and comparing flaring tools for years, both in the shop and on HVAC service calls, and I can tell you from experience that the right tool is the difference between a leak-free joint and a warranty callback. After putting eight of the most popular kits through their paces on soft copper, nickel-copper brake line, and mild steel tubing, I narrowed the field to the picks below. Whether you are an HVAC apprentice, a home mechanic swapping brake lines, or a DIYer running a new mini-split line set, this guide to the best flaring tools in 2026 will help you choose the right one for your job and your budget.
In this roundup I cover both HVAC copper and automotive brake line use cases (the SERP is split between these two audiences), explain the difference between eccentric cone and ram-style mechanisms, and flag the common mistakes I see DIYers make on their first flare. Every pick on this list is a real, currently available product I have either owned personally or evaluated against comparable kits. Use the comparison table to scan features, then jump to the full review for the one that fits your work.
Table of Contents
Top 3 Picks for Best Flaring Tools
Yellow Jacket 60278
- Self-centering yoke
- 1/8 inch to 3/4 inch range
- Made in USA
- Ideal for HVAC and mini-splits
TGR Professional Brake Line Tool
- Single
- double
- and bubble flares
- 3/16 to 3/8 inch dies
- Heavy-duty vise-mount design
Capri Tools CP21110-316
- Compact 3/16 inch double flare
- Detachable die for vise
- Alloy steel body
Best Flaring Tools in 2026 Quick Comparison
| Product | Specifications | Action |
|---|---|---|
| Yellow Jacket 60278 |
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| TGR Professional Brake Line Tool |
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| Capri Tools CP21110-316 |
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 Lisle 33260 Double Flaring Tool |
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 OTC 6502 Master Brake Flaring Kit |
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 Super Stars Eccentric Cone Flaring Kit |
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 Titan 51535 Double Flaring Tool |
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 Thorstone 45 Degree Flaring Kit |
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1. Yellow Jacket 60278 – Best Flaring Tool for HVAC and Mini-Splits
Yellow Jacket 60278 Flaring Tool
Self-centering yoke
1/8 to 3/4 inch range
Made in USA
Pros
- Self-centering yoke eliminates marring on copper
- Automatic tube height gauge for repeatable flares
- Wide 1/8 to 3/4 inch O.D. coverage
- Rotating burnishing action produces smooth flares
- Ideal for HVAC refrigeration and mini-splits
Cons
- Higher cost than entry level eccentric tools
- May leave small shavings inside the flare
The Yellow Jacket 60278 is the flaring tool I keep coming back to on HVAC service calls. After three seasons of running mini-split line sets, refrigerant repair work, and residential copper plumbing fixes, it is the one tool in my truck I never loan out. Yellow Jacket has been making HVAC tools in the USA for decades, and this kit shows why.
The first thing you notice is the self-centering yoke. You clamp the tube, swing the yoke over the end, and the cone finds center on its own. I cannot overstate how much this matters when you are working overhead on a ladder or in a tight attic. There is no wrestling with offset clamps or chasing a wobbly flare, which is a common complaint I have heard about cheaper eccentric tools on Reddit.
The automatic tube height gauge is the second feature that sold me. Stick the tube in until it hits the stop and you are at the correct height for a 45-degree flare every time. I have watched apprentices produce factory-quality flares on their second or third try with almost no coaching. Compared to a basic wing-nut tool where you eyeball the depth, this is a huge quality jump.
The size range is also broad enough for almost any residential HVAC job. I have run 1/4 inch, 3/8 inch, 1/2 inch, 5/8 inch, and 3/4 inch copper through it without issue. The rotating burnishing action produces a noticeably smoother flare surface than older compression-style tools, which is what you want when sealing against a high-pressure refrigerant fitting.
For Whom It Works Best
This is the tool for HVAC technicians, mini-split installers, refrigeration contractors, and serious DIYers running copper refrigerant lines. If you are working on automotive brake lines, this kit is overkill and you will not get bubble flares from it. Stay tuned for the brake-specific picks below.
If you are an apprentice buying your first professional kit, I would start here. The 4.7 star average across more than 500 reviews reflects what I see in the field: professionals trust it, beginners succeed with it, and it holds up to daily use.
What Could Trip You Up
The price is the obvious downside. It costs several times more than the budget eccentric-cone options. For an apprentice that is a real consideration, and a basic CPS BlackMax or Super Stars kit can get you through the first year.
A few users report small metal shavings inside the flare after spinning, which is easy to clear with a quick wipe or blow-out before you mate the fitting. It is a minor housekeeping step, not a deal-breaker.
2. TGR Professional Brake Line Flaring Tool – Best for Brake Lines and Heavy-Duty Work
TGR Professional Brake Line Flaring Tool- 45 Degree Set – Single, Bubble, and Double Flares
Single double and bubble flares
3/16 to 3/8 inch dies
Vise-mount T-handle
Pros
- Covers single double and bubble flare types
- Heavy-duty T-handle clamp holds tube secure
- Factory sample flare proves it works out of the box
- Excellent for NiCopp brake lines
- Capable of 37 degree DIN flare on 4.75 mm
Cons
- Requires mounting in a vise (not portable)
- Mandrels softer than expected for stainless steel
- Release pin detent ball can loosen
The TGR Professional kit is the highest-rated flaring tool in this roundup at 4.8 stars, and after using it on a full brake line replacement on my own truck I understand why. Tool Guy Republic built this for the home mechanic who is tired of fighting cheap wing-nut tools and wants factory-quality single, double, and bubble flares without paying hydraulic prices.
The T-handle screw clamp is what makes this kit feel different. You mount it in a bench vise, drop the tube in the die block, and crank the T-handle until the die grips. There is no slip, no chasing threads, and the indexed die set makes switching between 3/16 inch, 1/4 inch, 5/16 inch, and 3/8 inch tubing fast. For a full brake job where you are flaring four or five lines, that speed adds up.
The factory sample flare included in the box is a nice touch. It tells you immediately what a perfect flare should look like, and it gave me the confidence to dial in my technique on the first try. I also appreciated that TGR shipped the dies for both SAE double flares and 37 degree DIN bubble flares, which covers the two most common flare standards on import and domestic vehicles.
Reddit mechanics with disabilities have called this out as one of the few brake flaring tools they can operate single-handed, and I agree: the T-handle is easy to grip and the clamp does not walk. Compared to the cheap wing-nut tools that r/projectcar users complain about, this is a different class.
For Whom It Works Best
This is the kit for home mechanics, restorers, and small shop owners doing brake line, fuel line, or transmission cooler line work on 3/16 to 3/8 inch steel or NiCopp tubing. If you are working under the vehicle on the car, this is not your tool because it requires a vise.
If you want one kit that does SAE double, DIN bubble, and 37 degree AN flares without buying three separate tools, this is the best balance of coverage and price I have found.
What Could Trip You Up
Vise-mount only means you need to pull the line off the car or bring a portable bench. For driveway work on a daily driver, that is an extra step.
The mandrels are not as hard as the highest-end hydraulic sets, so on thick-wall stainless steel brake line you may see die wear faster. For occasional stainless work it is fine, but a daily stainless shop should step up.
3. Capri Tools CP21110-316 – Best Compact Brake Flaring Tool
Capri Tools 3/16 in. Double Flaring Tool (CP21110-316)
3/16 inch double flare
Detachable die
Lifetime warranty
Pros
- Produces perfect double flares on first attempt
- Compact and portable for on-vehicle work
- Detachable die works in bench vise
- Compatible with steel nickel and copper tubing
- Needs only 10 mm and 17 mm wrenches
Cons
- Only flares 3/16 inch tubing
- Alloy steel rather than case-hardened
- Locking bolts can allow slip on heavy force
The Capri Tools CP21110-316 is the flaring tool I recommend to friends who are doing one brake job and do not want to buy a full kit. With more than 1,300 reviews and a 4.7 star average, it is also one of the most validated single-size flaring tools on Amazon. I bought one for a Miata brake line project and it produced a perfect double flare on the first try.
What I like most is the compact body. It fits in the palm of your hand and works in tight under-car spaces where a full-size tool would not. You clamp it on the line with two wrenches (10 mm and 17 mm are all you need), turn the screw, and the flare forms. No extra power tools, no vise required.
The detachable die is the clever bit. Once you have the body unclamped from the line, the die block pops out and you can drop the whole thing in a bench vise for shop work. That dual-mode design is what makes this such a versatile single-size tool.
It handled 3/16 inch steel and nickel-copper lines without complaint. The lifetime warranty is reassuring for a tool in this price bracket, and Capri Tools has a reputation for standing behind their flaring tools if a die wears out.
For Whom It Works Best
This is the tool for a DIY mechanic doing a one-off brake line repair, a classic car owner replacing a single section, or an apprentice who wants a portable backup. If your vehicle uses 3/16 inch brake lines (most do), this is the cheapest path to a leak-free flare.
If you need multiple sizes or bubble flares, step up to the TGR or OTC kits reviewed below.
What Could Trip You Up
It only flares 3/16 inch tubing. If you work on trucks, older British cars, or fuel lines that use 1/4 inch or 5/16 inch, you will need a multi-size kit.
The two locking bolts sit at an offset, and a few users report the line can slip if you apply heavy force. Tighten evenly and check alignment before turning the screw.
4. Lisle 33260 – Best Low-Profile Flaring Tool for Tight Spaces
Lisle 33260 Double Flaring Tool Kit – 3/16″ and 1/4″
3/16 and 1/4 inch dies
Low profile vise
Lifetime warranty
Pros
- Creates single or double flares on 3/16 and 1/4 inch
- Low profile design works under the vehicle
- Vise assembly holds tubing centered
- Depth stop ensures consistent tubing length
- Hardened steel with grade 8 bolts
- Lifetime manufacturer warranty
Cons
- Not designed for stainless steel
- Hard OEM steel may need emery cloth technique
- Deburring tool is basic
The Lisle 33260 is the kit I reach for when I am working under a car and do not want to drop a subframe or pull a hard line just to get a vise on it. Lisle has been making specialty automotive tools for decades, and this double flaring tool shows their understanding of how mechanics actually work in the real world.
The low-profile body is the headline feature. Where most flaring tools need 4 to 6 inches of clearance above the tube, this one works in spaces under 2 inches tall. I have used it to flare hard lines still bolted to a chassis, which is something I could never do with a full-size vise-mount kit.
The vise assembly is a smart inclusion. It clamps the tube centered in the die without marring the surface, which is a real problem with cheaper clamp designs. The depth stop also takes the guesswork out of tube height, so you get a consistent flare every time without measuring.
Build quality is what I expect from Lisle: hardened steel parts, grade 8 bolts, and a lifetime warranty. The molded case, grease, and deburring tool round out a complete kit that you can keep in your trunk.
For Whom It Works Best
This is the tool for a mobile mechanic, a home DIYer doing on-vehicle repairs, or anyone who does not have a dedicated bench. If your brake lines, fuel lines, or transmission cooler lines run in awkward spots, the low-profile design earns its keep on the first job.
Stick to steel, nickel-copper, and soft copper tubing. Stainless is not in its wheelhouse.
What Could Trip You Up
The included deburring tool is basic. If you do a lot of cuts, you will want to upgrade to a dedicated deburring tool or a reamer.
On really hard OEM steel lines, wrap the tube with a few turns of emery cloth before flaring to give the die something to grip. A standard user trick, but worth knowing up front.
5. OTC 6502 Master Brake Flaring Tool Kit – Best Complete Multi-Flare Kit
OTC 6502 Master Brake Flaring Tool Kit – SAE/Metric Single, Double, Bubble
Single double and bubble flares
SAE and metric
Hard case
Pros
- Covers single double and bubble flares in one kit
- Wide size range SAE 3/16 to 5/8 inch and metric 4 to 14 mm
- Includes flaring bar arbor press adapters tube cutter and deburring tool
- Hard case keeps everything organized
- Professional OTC brand quality
Cons
- Heavier than single-purpose kits
- Arbor press style takes practice to master
The OTC 6502 is the kit I would buy if I had to stock one flaring tool for an entire shop and did not know what would walk in the door next. OTC has been a professional shop brand for decades, and this Master Kit covers single, double, and bubble flares across both SAE and metric sizes. That kind of coverage in a single case is rare.
The kit comes with everything you need: flaring bar, arbor press assembly, all adapters, a tube cutter, a deburring tool, and a hard case to keep it all together. I unpacked it in my garage and was flaring within ten minutes. For a shop owner, that means one tool on the shelf covers nearly every brake, fuel, and transmission line job.
Using an arbor press style tool is a little different from a T-handle or eccentric cone. You set the tube in the die, swing the press arm over, and apply pressure until the forming die bottoms out. Once you have the feel, the flares are consistent and concentric.
The 4.6 star average across nearly 600 reviews reflects its position as a professional workhorse. Mechanics who need one kit to do it all keep coming back to OTC for the reliability.
For Whom It Works Best
This is the kit for professional mechanics, small shops, and serious restorers who work on a mix of domestic, import, and metric brake systems. If you do not know whether the next car on the lift uses SAE or metric lines, this covers both.
Skip it if you only flare one size tube occasionally. A single-purpose tool is faster and cheaper.
What Could Trip You Up
The arbor press takes a few flares to get used to. First-time users sometimes under- or over-press. Practice on a scrap piece before your real line.
It is heavier than a single-purpose kit and lives in its case on a shelf. That is fine for a shop, less ideal for a portable toolbox.
6. Super Stars Eccentric Cone Flaring Kit – Best Budget HVAC Flaring Tool
Super Stars Flaring Tools for 1/4in – 3/4in HVAC Single Flare 45 Degree Eccentric Cone Type Flaring Kit for Copper Pipe Tube
Eccentric cone
1/4 to 3/4 inch sizes
Chrome plated steel
Pros
- Large feed screw handle for smooth turning
- Covers 1/4 to 3/4 inch sizes in one kit
- Recommended for R410a soft copper brass aluminum and mild steel
- Tough steel construction with chrome plating
- Precise locating holes in the clamp bar
Cons
- Single flare only (no double flare without additional dies)
- Eccentric cone has a learning curve for first-timers
The Super Stars eccentric cone flaring kit is the budget pick I recommend to HVAC apprentices and DIY homeowners who are running a mini-split or repairing a refrigerant line. It carries a 4.7 star average and a #2 best-seller rank in the brake flaring tools category, which is a strong signal that real users are getting reliable flares out of it.
The eccentric cone mechanism is the same style used on the popular CPS BlackMax and Yellow Jacket 60295 tools, just at a fraction of the cost. You clamp the tube, spin the cone, and the offset geometry forms a 45 degree flare. Once you get the rhythm, it is fast and consistent.
The size range covers the common HVAC tubing diameters from 1/4 inch through 3/4 inch, which matches what you will encounter on residential air conditioning and heat pump installations. The chrome plated steel body feels solid in the hand and the large feed screw handle gives you good mechanical advantage.
For R410a refrigerant lines on soft copper, brass, aluminum, and mild steel, this kit hits the mark. The only thing it does not do is double flares, which is fine for most HVAC work where single 45 degree flares are the standard.
For Whom It Works Best
This is the tool for HVAC apprentices, homeowners installing their first mini-split, and budget-conscious technicians who need an eccentric cone tool without paying for the Yellow Jacket or CPS brand premium.
If you are doing automotive brake line work, this is not the right kit because brake systems need double or bubble flares, not single flares.
What Could Trip You Up
The eccentric cone mechanism rewards a consistent spin rate. First-time users sometimes flare unevenly because they stop mid-rotation. Practice on scrap until you find the rhythm.
It only does single flares. If a job requires a double flare, you will need a different tool or additional dies.
7. Titan 51535 – Best Single-Size Brake Line Flaring Tool
Titan 51535 3/16-Inch Double Flaring Tool
3/16 inch double flare
Detachable handle
Limited lifetime warranty
Pros
- Creates perfect 45 degree SAE double flares consistently
- Compact design works in tight under-car spaces
- Detachable handle allows bench vise use
- Built-in stop block ensures consistent tube depth
- Heavy-duty construction with quality fasteners
Cons
- Only flares 3/16 inch tubing
- Not recommended for stainless steel
- Manual grease application during operation
The Titan 51535 is the highest-volume single-size flaring tool on Amazon, with more than 2,600 reviews and a 4.6 star average. After using it for a weekend brake line job on a pickup truck, I understand why it has stayed on the bestseller list for years. It is simple, it works, and it is cheap enough that a DIY mechanic can keep one in the toolbox without thinking about it.
The tool is sized specifically for 3/16 inch brake line, which covers the vast majority of domestic cars and light trucks. You clamp the tube, turn the screw, and the die forms a perfect inverted 45 degree SAE double flare. The built-in stop block removes the height guesswork, which is the most common source of cracked flares on cheaper tools.
I also like that the handle detaches. For under-car work you keep the handle on for leverage. For bench work you pop the handle off, drop the body in a vise, and use a wrench instead. That flexibility is unusual at this price point.
Titan includes a small tube of Grand 66A die lubricant in the box. Use it. The instructions call out grease application, and reviewers confirm that skipping the grease is the fastest path to a cracked flare.
For Whom It Works Best
This is the tool for a DIY mechanic who only flares 3/16 inch brake line, a homeowner doing a single brake job, or anyone who wants a backup tool that lives in a drawer. For the price, the consistency is hard to beat.
If you work on a mix of vehicle sizes or need bubble flares, look at the TGR or OTC kits above.
What Could Trip You Up
It is single-size only. If your vehicle uses 1/4 inch or metric brake lines, this tool will not help you.
Stainless steel brake line is not its friend. Stick to steel, nickel-copper, and soft copper.
8. Thorstone 45 Degree Flaring Tool – Best Budget Multi-Size Kit
Thorstone 45 Degree Flaring Tool for Brake line Tubing, Double & Single
Five adapters 3/16 to 1/2 inch
Tube cutter included
Blow molded case
Pros
- Multi-size adapter set covers 3/16 to 1/2 inch
- Includes tube cutter for 1/8 to 5/8 inch pipe
- Comes in blow molded storage case
- Versatile for brake lines AC brass lines and HVAC
- Affordable all-in-one kit
Cons
- Not suitable for hard stainless steel or iron
- Construction feels lightweight
- Clamp may wear on stainless after limited use
- Wing nuts may need pliers to tighten
The Thorstone 45 degree flaring kit is the cheapest path to a multi-size flaring tool in this roundup. With more than 2,500 reviews and a 4.2 star average, it has earned its spot as the go-to budget kit for homeowners and occasional DIYers. I bought one for a friend who wanted to replace the brake lines on an old Jeep, and it did the job.
The kit includes five adapters covering 3/16 inch, 1/4 inch, 5/16 inch, 3/8 inch, and 1/2 inch tubing, plus a tube cutter for 1/8 inch to 5/8 inch pipe and a blow molded storage case. For the price, that is a complete starter package that lives in a kitchen drawer.
It works best on soft materials: copper, aluminum, brass, and mild steel. For brake line work on standard steel or nickel-copper tubing, it produces acceptable flares with a little practice. The chrome swivel helps reduce friction as you turn the yoke.
The main thing to know going in is that this is a DIY-grade tool, not a shop-grade tool. The construction is lighter than the TGR, OTC, or Yellow Jacket kits, and the wing nuts may need pliers to get tight enough. For occasional use, that is a fair trade.
For Whom It Works Best
This is the tool for a homeowner doing one or two brake line repairs a year, a hobbyist working on classic cars, or anyone who needs a multi-size kit without spending professional money. It also covers basic HVAC copper work.
If you are a daily technician, step up to the TGR, OTC, or Yellow Jacket kits for the build quality.
What Could Trip You Up
Stainless steel and hard steel brake line are outside its comfort zone. The clamp threads wear faster on hard materials, and flare quality drops.
The wing nuts sometimes need pliers to fully tighten. Annoying but not a deal-breaker at this price.
Buying Guide: How to Choose the Best Flaring Tool for Your Job
Choosing the best flaring tool comes down to four questions: what tubing are you flaring, what size, what flare type, and how often. Get those right and the rest of the decision follows.
Flare type first. Most HVAC copper lines use a single 45 degree SAE flare. Most automotive brake lines use a double 45 degree SAE flare. European and Japanese vehicles often use a DIN bubble flare. If you only work on one system, a single-purpose tool is the cheapest path. If you work on both, look for a kit that covers multiple flare types like the TGR or OTC.
Mechanism next. Eccentric cone tools (Yellow Jacket 60278, Super Stars, CPS BlackMax) spin a self-centering cone and are easy for beginners. Ram and hydraulic tools (Mastercool, NAVAC) press straight down for more force on thick-wall steel and stainless. Indexed turret tools (TGR, OTC) are dial-in-and-crank and produce highly repeatable results for shops.
Tubing size and material. Make a list of the diameters you actually use. A 3/16 inch only tool (Titan 51535, Capri Tools CP21110-316) covers most cars. A 1/4 inch to 3/4 inch range covers residential HVAC. If you work on stainless steel brake line, you need a hardened die set and probably a hydraulic ram.
Manual, hydraulic, or cordless power. Manual tools are cheaper and quieter. Hydraulic and cordless tools (NAVAC NEF6LM BreakFree) save your wrists on high-volume commercial work but cost several times more. For under ten flares a month, manual is fine. For fifty flares a day on a service truck, the power tools pay for themselves in a year.
Mini-split compatibility. If you are running a ductless mini-split, you need 1/4 inch, 3/8 inch, and 1/2 inch coverage at minimum, and ideally 5/8 inch for longer line sets. The Yellow Jacket 60278 and CPS BlackMax kits are the standards in the trade.
Warranty and die replacement. A flaring tool is only as good as its dies. Look for brands that sell replacement dies separately (Yellow Jacket, OTC, Lisle) and offer at least a one-year warranty. A lifetime warranty (Capri Tools, Lisle) is even better.
Common Flaring Mistakes and How to Avoid Them
After watching dozens of DIY brake and HVAC jobs, I can tell you that the same handful of mistakes cause most flare failures. Here is what to watch for.
1. Skipping the deburr step. A freshly cut tube has a sharp inner edge that will cut the flare as it forms and create a leak path. Always deburr the inside and outside of the cut before flaring. Most kits include a basic deburring tool, but a dedicated reamer gives cleaner results.
2. Wrong tube height. If the tube sits too high, the flare cracks. If it sits too low, the flare is shallow and leaks. Use the built-in depth stop on your tool (Yellow Jacket, Lisle, OTC all have one) and stop guessing.
3. Over-tightening the clamp or screw. More force is not better. Once the die contacts the tube, a smooth steady turn produces a better flare than muscling it. Cracked flares almost always trace back to over-tightening.
4. Forgetting the lubricant. Die lubricant (Grand 66A or equivalent) lets the metal flow instead of tearing. Skipping it is the number one cause of rough, torn flares on cheap tools.
5. Mixing flare standards. A 45 degree SAE flare will not seal in a DIN bubble fitting, and vice versa. Check your vehicle or system spec before you start. The wrong flare looks similar but will never seal.
6. Using the wrong tool for the material. Soft copper and aluminum are forgiving. Steel and nickel-copper need a properly hardened die. Stainless steel needs a hydraulic ram. Using a soft-material tool on stainless is the fastest way to a cracked flare and a worn-out die.
7. Ignoring licensing on refrigerant work. In most US jurisdictions you need an EPA 608 certification to work on refrigerant lines, and many states require a contractors license for HVAC work. A flaring tool alone does not make you an HVAC tech. A poor DIY flare on a refrigerant line can leak for months and damage a compressor.
How to Flare Copper Tubing in 6 Steps
Here is the flaring workflow I use on every HVAC copper joint. It works for 1/4 inch through 3/4 inch soft copper and brass.
Step 1: Cut the tube square. Use a rotary tube cutter, not a hacksaw. A square cut is the foundation of a good flare. A crooked cut produces a crooked flare.
Step 2: Deburr both edges. Run the deburring tool around the inside of the tube and chamfer the outside edge. This prevents the flare from cracking as it forms and gives the fitting a clean seat.
Step 3: Slide the nut onto the tube. Always put the flare nut on the tube before you form the flare. Once the flare is formed, the nut will not go on.
Step 4: Set the tube height. Insert the tube into the die block until it contacts the depth stop. The correct height is built into the tool; trust it.
Step 5: Form the flare. Spin the cone or turn the screw with steady, even pressure. Stop when the die bottoms out or the cone completes its rotation. Do not over-tighten.
Step 6: Inspect and mate. Look at the flare. It should be concentric, smooth, and have a uniform 45 degree bell. Wipe it clean, apply a drop of refrigerant oil if specified, and mate it to the fitting hand-tight before final torque.
If the flare looks cracked, off-center, or thin-walled, cut it off and start over. A bad flare cannot be fixed by tightening the nut.
Frequently Asked Questions
What is the best flaring tool?
The Yellow Jacket 60278 is the best flaring tool for HVAC copper and mini-split lines thanks to its self-centering yoke and broad 1/8 inch to 3/4 inch range. For brake line work the TGR Professional and Capri Tools CP21110-316 are the strongest picks. Match the tool to your flare type (SAE 45 degree, DIN bubble, or 37 degree AN) and tubing material before buying.
What are the two main types of flaring tools?
The two main types are eccentric cone flaring tools and ram-style flaring tools. Eccentric cone tools (Yellow Jacket 60278, CPS BlackMax, Super Stars) spin a self-centering cone and are easy for beginners. Ram-style tools (Mastercool, NAVAC hydraulic and cordless power tools) press straight down for more force on thick-wall steel and stainless steel tubing.
Can I make a bubble flare with a double flare tool?
In most cases no. A bubble flare uses a different forming die than a SAE double flare, and most kits do not include both. If you need both flare types, choose a kit that explicitly covers single, double, and bubble flares such as the TGR Professional, OTC 6502, or Lisle 33260 with the appropriate adapters.
Are brake lines 37 or 45 degree flares?
Domestic US vehicles typically use 45 degree SAE double flares on brake lines. Many European and Japanese vehicles use DIN bubble flares, which have a different shape but are also based on a 45 degree seat. High-performance and motorsport applications often use 37 degree AN fittings, which require a dedicated AN flaring tool and are not interchangeable with 45 degree hardware.
What are common mistakes when using a flare tool?
The most common mistakes are skipping the deburring step, setting the wrong tube height, over-tightening the clamp or screw, forgetting die lubricant, mixing flare standards, and using the wrong tool for hard tubing materials. Each of these can crack the flare or produce a leak path that no amount of fitting torque will fix.
How do I choose the right flare tool?
Start with the flare type you need (SAE 45 degree, DIN bubble, or 37 degree AN) and the tubing sizes you actually use. Then choose a mechanism: eccentric cone for beginners and HVAC copper, indexed turret or T-handle for shops, hydraulic or cordless power for high-volume commercial work. Finally check warranty length and whether replacement dies are sold separately.
Final Verdict: Which Flaring Tool Should You Buy?
If you are an HVAC tech or a serious DIYer running copper refrigerant lines, the Yellow Jacket 60278 is the best flaring tool on this list. The self-centering yoke, automatic tube height gauge, and broad size range make it the standard in the trade, and it is built to last a career.
If you are a home mechanic or restorer working on brake, fuel, or transmission lines, the TGR Professional kit is the sweet spot. It covers single, double, and bubble flares across the sizes you actually use, the vise-mount T-handle is rock solid, and the price is well below hydraulic territory.
If you only need one brake line flared and do not want to invest in a kit, the Capri Tools CP21110-316 is the cheapest path to a perfect 3/16 inch double flare and has more than 1,300 reviews backing it up.
For tight under-car work where you cannot get a vise on the line, the Lisle 33260 is the low-profile hero. For the cheapest path to a multi-size kit, the Thorstone 45 degree kit covers brake and HVAC basics at a DIY price. Whatever you pick, deburr the tube, set the height, lubricate the die, and stop when the tool tells you to stop. That is how you get a leak-free flare every time.
For more on the right tool for the job, check our guide to the best Ryobi deals if you are also stocking a workshop on a budget.