Double Flare Tool: 5 Top Picks Compared

Working on your own brake lines can be intimidating, but having the right tool makes all the difference. A reliable double flare tool ensures safe, leak-free connections every time.

This guide compares five top-rated double flare tools, from compact on-car models to professional vise-mounted kits. We’ll help you find the perfect match for your skill level and project needs.

Capri Tools 3/16 in. Double Flaring Tool – Compact & Fast

The Capri Tools double flaring tool is designed to get the job done in half the time, thanks to its compact and portable build. It creates high-quality 45-degree SAE double flares on 3/16-inch tubing, making it ideal for brake lines. You’ll appreciate how it works flawlessly with non-stainless steel, nickel, and copper tubing, giving you versatility for common automotive repairs.

Its compact design lets you create perfect double flares both off and on the vehicle, even in tight spots. The detachable die also allows you to use it with a bench vise for added stability. If you need a fast, portable solution for 3/16-inch tubing, this tool is a solid choice.

View all product features

• Get the job done in half the time: this compact and portable Double Flaring Tool lets you easily create high quality 45-degree SAE double flares on 3/16 in. tubing such as brake lines
• Works flawlessly with 3/16 in. non-stainless steel, nickel, and copper tubing
• Compact design lets you create perfect double flares both off vehicle and on vehicle, even in tight spots
• Detachable die lets you also use with a bench vise
• All-in-one tool. All you need is a 10 mm and a 17 mm wrench to work with the tool

---

SEEKSELF Professional Brake Line Flaring Tool Kit – Versatile Vise Mount

The SEEKSELF Professional Brake Line Flaring Tool Kit is a vise-mounted system that handles 45-degree single, double, and bubble flares. It works with 3/16-inch, 1/4-inch, 5/16-inch, 3/8-inch, and 4.75mm tubing, covering a wide range of materials including stainless steel, steel, and soft metals. This makes it a versatile addition to any workshop.

To use it, you clamp the bottom in a reliable vise—it’s not suitable for under-car use. The kit includes the tool body and four split dies. Remember to wear goggles and gloves, as debris can pop up when turning the handle. For a professional-grade, multi-size flaring tool, this kit delivers excellent value.

View all product features

• Professional Tool: SEEKSELF Brake Line Flaring Tool Kit can be used to create 45-degree single, double and bubble brake flares on stainless steel, steel and some soft metal tubing like copper. Includes 4 Sets of Die Blocks, suitable for 3/16"(4.75mm), 1/4"(6.35mm), 5/16"(8mm) and 3/8"(9.5mm) O.D. lines.
• How to Mount and Use: The bottom of the tool should be clamped by a reliable vise, make sure the tool is firmly held before use. NOT suitable for use under car. The set comes with a paper graphic instruction manual.
• Precautions: Wear goggles and gloves before operating the tool, and stay away from others to prevent debris from popping up when turning the handle.
• Package Includes: Brake Line Flaring Tool Body (Vise Mounted); 4 Types of Split Dies: 3/16"(4.75mm), 1/4"(6.35mm), 5/16"(8mm) and 3/8"(9.5mm); Long Lever Handle; Instruction Manual; Plastic Suitcase.
• Friendly Design: The split dies are equipped with a limiting hole to effectively avoid them from slipping. The handle is designed to apply force by turning it to the left, which makes it easier for right-handed use and less effort.
• The tool body is made of high-quality steel. It is suitable for both amateur and professional car repair work and plumbing work.

---

GEAROLL Brake Line Flaring Tool Kit – Precision for 3/16" & 1/4"

The GEAROLL Brake Line Flaring Tool Kit is a precision tool designed for 3/16-inch and 1/4-inch tubes, creating 45-degree SAE double flares, single flares, and bubble flares. It works perfectly with copper, aluminum, and nickel-copper tubing, but you should avoid using it with stainless steel. The tool ensures secure and safe connections for your brake and hydraulic lines.

Ease of use is a highlight—the tool tightly locks the tube in place, preventing slippage and maintaining perfect alignment with the OP1 punches. It also comes with an extra tube cutter for convenience. Made from high-strength carbon steel, this double flare tool is durable and reliable for repeated use.

View all product features

• Applicable Tubes: The brake line flaring tool works perfectly with copper, aluminum and nickel-copper tubing; Please do not use it with stainless steel tube, as its material is too hard
• Precision Tool: This brake line flare is suitable for 3/16" and 1/4" tubes, creating 45° SAE double flares, single flares and bubble flares, ensuring secure and safe connections; good choice for brake system repairs and hydraulic line maintenance
• Ease to Use: The flaring tool kit can tightly lock tube in place, preventing slippage and maintaining perfect alignment with OP1 punches; with extra gifts tube cutter for tube cutting; hex wrench for tighten and unscrew bolts and a pair of gloves for convenient operation
• Premium Material: Made from high-strength carbon steel, this double flare tool is durable and resistant to wear, capable of withstanding long-term use
• Kit Includes: The line flare tool includes 1x dual flaring tools in 3/16" and 1/4" sizes; 1x detachable handle; 2x positioning bolts; 2x double-ended OP1 punches; 1x mold lubricant; 1x hex wrench; 1x tube cutter; 1x instruction book; 1x pair of gloves and 1x blow-molded case

---

Titan 51535 3/16-Inch Double Flaring Tool – On-Vehicle Repair

The Titan 51535 Double Flaring Tool is a compact set designed for on-vehicle use. It creates perfect inverted 45-degree SAE double flares with 3/16-inch steel and nickel-copper tubing. The set includes the flaring tool with a removable handle, a positioning bolt, a double-ended OP1/OP2 punch, and a container of Grand 66A die lubricant.

Its compact design allows you to work in tight under-car spaces, making it ideal for repairing brake lines in place. The handle can be removed if you prefer to use it in a bench vise. Note that it’s not recommended for stainless steel tubing. For a complete, ready-to-use kit that fits in tight spots, the Titan is a great option.

View all product features

• Set Contents: (1) 3/16-Inch Double Flaring Tool with Removable Handle, (1) Positioning Bolt, (1) Double Ended OP1/OP2 Punch, (1) Container of Grand 66A die lubricant
• Creates a perfect inverted 45-Degree SAE double flare with 3/16-inch steel and nickel-copper tubing – Not recommended for use on stainless steel tubing
• Can be used on the vehicle; Compact design can be used in tight under-car spaces allowing user to repair brake lines in place on the vehicle
• Handle can be removed if you prefer to use in a bench vise
• SAE Double Flare is an inverted 45-Degree flare typically used in automotive brake line applications – 3/16-Inch brake lines are on almost all cars and trucks making this flaring tool usable with most vehicles

---

DPTOOL Brake Line Flaring Tool Kit – Multi-Size & Multi-Flare

The DPTOOL Brake Line Flaring Tool Kit is a multi-functional tool that creates 45-degree single, double, and bubble flares on 304 stainless steel, steel, and soft metal tubing. It works with 3/16-inch, 1/4-inch, 5/16-inch, 3/8-inch, and 4.75mm diameter lines, making it suitable for automotive brake lines, transmission cooler lines, and fuel lines.

Made from high-quality steel that is heat-treated and oxidized, this tool is extremely hard, durable, and resistant to damage. To make perfect flares, you select the flat face die, place the tool in a secure vise, and follow the simple process. If you need a durable, multi-size flaring tool that handles stainless steel, this kit is a top contender.

View all product features

• Multi Purpose Flaring Tool: This is a multi-functional brake line flaring tool. Used to create 45-degree single, double and bubble brake flares on 304 stainless steel, steel and soft metal tubing in a short time. It produces flares of high quality and accuracy that do not lead to subsequent leaks in hydraulic or brake lines, making it a must-have brake flaring tool for the DIY or mechanic. NOTE: this tool must be used with a vice, so you can only use it on the bench
• Wide Application: This flaring tool can be used with 3/16", 1/4", 5/16", 3/8" and 4.75mm diameter lines, Suitable for automotive brake lines, transmission cooler lines and fuel lines and more. Note: Single Flare: Rotate the die head to OP.0 then OP.2; Bubble Flare: Rotate the die head to OP.0 then OP.1; Double Flare: Rotate the die head to OP.0, then OP.1, finally OP.2
• Professional Brake Flaring Tool: Made of high quality steel and heat-treated and oxidized, it is extremely hard, durable and not easy to be damaged; at the same time, it has been professionally designed and rigorously tested to be highly accurate and stable, and it can produce many types of perfect flares in a short period of time, it is professional brake line and tubing flaring tool
• Easy to Make Perfect Flares: First, select the flat face die, place the tool in a secure vise, tighten the clamps so they do not move; Second, loosen the clamps, select the desired parting size, insert the die into the rectangular recess in the base of the tool, place the tube between the two halves of the die; Then, turn the clamps back to their original position, OP.0 is aligned with the port of the tube, push the OP.0 to press it into the port of the tube; Finally, select the desired, select the desired size of reaming cone OP.1, align the tube port, turn the handle and press it into the tube port, then, select the desired size OP.2, repeat the operation, and you can easily complete flare
• Tips for Use: Before doing a flare, deburr the inside and outside of the tubing to ensure that metal shavings and impurities are removed from the inside and outside of the tubing. Then, apply a small amount of anti-seize to the end of the cut tubing to prevent problems when squeezing. Also, it can be added a little oil to the flaring cones (OP.1 and OP.2). Finally, it is a matter of taking care to put the appropriate fittings on the ends of the tubing, with the flared ends facing outward
• 45 Degree Flaring Tool Kit: This flaring tool kit includes vise mounted brake flaring tool body, 45 degree rotating die head, lever handle, 4 types of 45-degree split dies blocks: 3/16"(4.75mm), 1/4"(6.35mm), 5/16"(8mm) and 3/8"(9.5mm), 3-19mm 1/8''-3/3'' line cutter/separator tool, a portable plastic suitcase and instruction manual

---

Buyer’s Guide: What to Consider

Choosing the right double flare tool depends on your specific needs. Consider these key factors to make an informed decision.

• Tubing Size Compatibility: Ensure the tool matches the tubing diameter you use. Common sizes are 3/16-inch for brake lines, but some kits offer multiple dies for 1/4-inch, 5/16-inch, and 3/8-inch.
• Flare Type Needed: Most tools create 45-degree SAE double flares for brake lines. Some also produce single or bubble flares. Choose based on your vehicle's requirements.
• On-Vehicle vs. Bench Use: Compact tools allow flaring without removing the line, ideal for tight spaces. Vise-mounted tools offer more stability but require a workshop bench.
• Material Compatibility: Check if the tool works with your tubing material. Many tools handle copper, aluminum, and nickel-copper, but not all are suitable for stainless steel.
• Build Quality and Durability: Look for tools made from hardened steel or carbon steel. Heat-treated components resist wear and ensure consistent, reliable flares over time.

Conclusion

Selecting the best double flare tool comes down to your typical repair scenario. For on-car repairs in tight spaces, the Capri Tools or Titan models are excellent choices. If you need a versatile workshop tool for multiple tubing sizes, the SEEKSELF or DPTOOL kits offer great flexibility.

For precision work with copper and aluminum, the GEAROLL tool is a reliable option. Whichever you choose, a quality double flare tool ensures safe, leak-free brake line connections for your projects.