Double Flaring Tool for Stainless Steel Tubing Reviews: 5 Best Options

Working with stainless steel tubing, especially for brake lines, demands precision and the right tool. A poor flare can lead to leaks or failure, so choosing a reliable double flaring tool is critical for a safe, professional result.

This guide reviews five top-rated double flaring tools designed to handle stainless steel tubing. Whether you need a vise-mounted kit for the shop or a compact tool for on-vehicle repairs, you’ll find the best option for your project here.

SEEKSELF Professional Brake Line Flaring Tool Kit – Versatile Vise Mount

The SEEKSELF Professional Brake Line Flaring Tool Kit is a vise-mounted powerhouse that handles 45-degree single, double, and bubble flares on stainless steel, steel, and soft metal tubing. It includes split dies for 3/16″, 1/4″, 5/16″, and 3/8″ sizes, plus a 4.75mm die, making it incredibly versatile for various automotive and hydraulic applications. The tool body is designed to be clamped securely in a bench vise, ensuring stability during flaring.

You’ll appreciate the included precautions—wear goggles and gloves, as debris can pop up when turning the handle. This kit is not suitable for use under a vehicle, so it’s best for bench work. The black finish and robust construction suggest durability, and the ability to create bubble flares adds flexibility for European-style fittings. If you need a comprehensive, shop-grade flaring solution, this kit delivers.

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• 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.

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Capri Tools 3/16 in. Double Flaring Tool – Compact On-Vehicle Option

The Capri Tools 3/16 in. Double Flaring Tool is designed for portability and ease of use, letting you create high-quality 45-degree SAE double flares on 3/16″ tubing. It works flawlessly with non-stainless steel, nickel, and copper tubing, but note that it is not recommended for stainless steel. Its compact design allows you to create perfect double flares both off and on the vehicle, even in tight spots like under the dash or near the fuel tank.

The detachable die lets you also use it with a bench vise, giving you flexibility in how you work. The tool is lightweight and easy to carry, making it a great choice for mobile mechanics or DIYers who need to repair brake lines in place. While it’s limited to 3/16″ tubing, that covers most automotive brake lines. If you primarily work with non-stainless materials and need a portable solution, this is a solid pick.

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• 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

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DPTOOL Brake Line Flaring Tool Kit – 37 & 45 Degree Dual Angle

The DPTOOL Brake Line Flaring Tool Kit is a multi-functional tool that creates both 37 and 45-degree single, double, and bubble flares on 304 stainless steel, steel, and other metals. It works with 3/16″, 1/4″, 5/16″, 3/8″, 4.75mm, and 6mm diameter lines, covering a wide range of automotive brake, transmission cooler, and fuel line applications. The tool is made from high-quality steel that is heat-treated and oxidized for extreme hardness and durability.

To make perfect flares, you select the flat face die, place the tool in a secure vise, and follow the straightforward process. The dual-angle capability is a standout feature, allowing you to handle both SAE (45-degree) and JIC (37-degree) fittings with one tool. This is especially useful if you work on a variety of vehicles or equipment. The kit’s professional-grade construction ensures it will last through many projects.

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• 37 and 45 Degree Flaring Tool: This is a multi-functional brake line flaring tool. Used to create 37 and 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" 4.75mm and 6mm 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
• A Complete Flaring Kit: This flaring tool kit includes vise mounted brake flaring tool body, 37 degree rotating die head, 45 degree rotating die head, lever handle, 5 types of 45-degree split dies blocks: 3/16"(4.75mm), 1/4"(6.35mm), 5/16"(8mm), 3/8"(9.5mm) and 6mm; 4 types of 37-degree split dies blocks: 3/16"(4.75mm), 1/4"(6.35mm), 5/16"(8mm) and 3/8"(9.5mm); 37 degree 3/16'' rotating die head replacement drill bit, a portable plastic suitcase and instruction manual

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DPTOOL Brake Line Flaring Tool Kit – 45 Degree Only, Vise Mount

This DPTOOL Brake Line Flaring Tool Kit focuses on 45-degree single, double, and bubble flares, making it ideal for standard automotive brake and fuel line work. It is designed for use on 304 stainless steel, steel, and other metals, and accommodates 3/16″, 1/4″, 5/16″, 3/8″, and 4.75mm diameter lines. The tool is made from high-quality steel that is heat-treated and oxidized for maximum hardness and durability, ensuring it can handle repeated use without wear.

Using the tool is straightforward: select the flat face die, secure the tool in a vise, and create your flares. The kit’s simplicity is its strength—no extra angles to confuse, just reliable 45-degree flares every time. If you primarily work on vehicles with SAE fittings and want a dedicated, robust tool for stainless steel, this is a great choice. The bubble flare capability also covers European-style connections.

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• 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

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

The Titan 51535 Double Flaring Tool is a compact, on-vehicle solution for creating inverted 45-degree SAE double flares on 3/16-inch steel and nickel-copper tubing. It is not recommended for use on stainless steel tubing, so keep that in mind. 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 to ensure smooth operation.

Its compact design allows you to use it in tight under-car spaces, making it ideal for repairing brake lines in place on the vehicle. The removable handle gives you the option to use it in a bench vise if you prefer. The included lubricant is a nice touch, helping to prevent galling and extend tool life. If you work with steel or nickel-copper tubing and need a portable, all-in-one kit, this is a practical choice.

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• 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

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Buyer’s Guide: What to Consider

Choosing the right double flaring tool for stainless steel tubing depends on your specific needs. Consider these key factors to make an informed decision.

• Tubing Material Compatibility: Ensure the tool is rated for stainless steel if that's your primary material. Some tools are designed only for steel or copper-nickel.
• Flare Types Needed: Consider whether you need single, double, bubble, or both 37 and 45-degree flares. Multi-angle tools offer more versatility.
• Tubing Size Range: Check the die sizes included. Common automotive sizes are 3/16", 1/4", 5/16", and 3/8". Metric sizes like 4.75mm and 6mm are also available.
• Mounting Method: Vise-mounted tools offer stability for bench work, while compact tools allow on-vehicle repairs. Choose based on your workspace.
• Build Quality and Durability: Look for heat-treated, oxidized steel construction for longevity. A durable tool will withstand repeated use without deforming.

Conclusion

Selecting the best double flaring tool for stainless steel tubing comes down to your work style and materials. For shop use with multiple tubing sizes, the SEEKSELF or DPTOOL kits are excellent. If you need portability for on-vehicle repairs, the Capri Tools or Titan options are great, but remember they don’t handle stainless steel.

For the most versatility with stainless steel, the DPTOOL dual-angle kit is a standout. Whichever you choose, investing in a quality tool ensures safe, reliable flares every time.