Best Double Flare Tool: Practical Features for Easier Everyday Use

A strong double flare tool creates consistent 45-degree flares while matching your tubing size, material, and workspace, making it suitable for brake-line repairs and other tubing jobs. The 10 options here range from compact 3/16-inch and 1/4-inch tools designed for work on the vehicle to bench-mounted kits covering several diameters and flare styles. Some support only non-stainless steel, nickel, copper, or other soft tubing, while others list stainless-steel compatibility.

Capacity also varies: a dedicated tool may be faster for one common line size, whereas a larger kit can handle bubble, single, and double flares. Pay close attention to whether the tool requires a vise, which dies are included, and whether the manufacturer excludes hard or stainless tubing.

The best double flare tool depends on the line size and working position. For compact on-vehicle repairs, Capri Tools’ 3/16-inch and 1/4-inch tools create 45-degree SAE double flares and work with non-stainless steel, nickel, and copper tubing. Titan’s 3/16-inch tool offers a removable handle and includes a positioning bolt, punch, and lubricant.

For broader bench work, multi-size kits from Orion Motor Tech, Lisle, SEEKSELF, TUBPRO, DPTOOL, and Fanmoss add more flare types or tubing diameters, but several require a vise.

Double Flare Tool Comparison: Features and Applications

Image	Product	Buy
Best Pick 1	Capri Tools 3/16 in. Double Flaring Tool (CP21110-316) Best for: Specific Inch Size Brand: Capri Tools | Color: Black	View on Amazon
Best Pick 2	Titan 51535 3/16-Inch Double Flaring Tool Best for: Standard Inch Size Brand: Titan | Color: ‎Factory	View on Amazon
Best Pick 3	OMT Brake Line Flaring Tool Kit, 45 & 37 Degree Bubble Double Flare Tool Best for: Multiple Angles Brand: Orion Motor Tech | Included Components: ‎1x Base Tool 2x Handles 2x Replacement Blades, 4x Dies 2x Die Heads 1x Cutter 1x Deburring Tool	View on Amazon
Best Pick 4	Lisle 33260 Double Flaring Tool Kit – 3/16" and 1/4" Best for: Versatile Tubing Sizes Brand: Lisle | Color: Factory	View on Amazon
Best Pick 5	Professional Brake Line Flaring Tool Kit for 45 Degree Single, Double and Bubble Flares, 3/16", 1/4", 5/16", 3/8" and 4.75mm Steel Copper Metal Tubing, Black Best for: Comprehensive Kit Brand: SEEKSELF | Item Weight: ‎8.89 pounds	View on Amazon

How We Compared These Products

We compared dimensions, capacity, materials, compatibility, included components, and care requirements across many Amazon listings. These details matter because the product must fit the available space, intended use, setup requirements, and maintenance routine. After examining the wider field, we selected 10 products from Capri Tools, Titan, Orion Motor Tech, Lisle, SEEKSELF, TUBPRO, DPTOOL, and Fanmoss.

The shortlist includes products such as Capri Tools 3/16 in. Double Flaring Tool (CP21110-316), Titan 51535 3/16-Inch Double Flaring Tool, and Orion Motor Tech OMT Brake Line Flaring Tool Kit.

Every recommendation is tied to information stated for that specific product; unclear or missing features were treated as unknown rather than filled with assumptions.

Detailed Reviews: Best Double Flare Tool

1. Capri Tools 3/16 in. Double Flaring Tool (CP21110-316)

Best for: 3/16 in. tubing repairs.

Create high-quality 45-degree SAE double flares on 3/16 in. tubing in half the time with this compact and portable double flaring tool. It works flawlessly with non-stainless steel, nickel, and copper tubing, enabling efficient repairs.

This alloy steel and copper tool's compact design allows for perfect double flares both off and on the vehicle, even in tight spots. The detachable die enables use with a bench vise for added versatility. Its dimensions of 8.9 x 5 x 1.55 inches and weight of 12.8 ounces make it manageable for various repair scenarios.

Product Details

Pros

• Creates 45-degree SAE double flares
• Works on 3/16 in. tubing
• Compact and portable design
• Detachable die for bench vise use

Cons

• Not suitable for stainless steel tubing.

Ideal for mechanics and DIYers needing to repair 3/16 in. brake lines on or off the vehicle. Ensure tubing material is compatible, as it is not designed for stainless steel.

2. Titan 51535 3/16-Inch Double Flaring Tool

Best for: On-vehicle brake line repair.

Repair vehicle brake lines in place with this compact double flaring tool, designed to create perfect inverted 45-degree SAE double flares. Its user-friendly design and removable handle simplify the process for on-vehicle repairs.

This tool is indispensable for repairing vehicle brake lines, allowing work directly on the vehicle in tight under-car spaces. It creates perfect inverted 45-degree SAE double flares on 3/16-inch steel and nickel-copper tubing. The set includes a positioning bolt, punch, and lubricant for a complete repair solution.

Product Details

Pros

• Creates inverted 45-degree SAE double flares
• Compact design for on-vehicle use
• Removable handle for convenience
• Includes positioning bolt and punch

Cons

• Not recommended for stainless steel tubing.

Perfect for automotive technicians and DIYers needing to perform brake line repairs directly on the vehicle. It is not suitable for stainless steel tubing applications.

3. OMT Brake Line Flaring Tool Kit, 45 & 37 Degree Bubble Double Flare Tool

Best for: Versatile line flaring.

Create leak-proof flares on copper, aluminum, and other metal pipes with this versatile flaring tool kit. It features dual rotating die heads offering 37° and 45° angles for single, bubble, and double flares.

This kit includes dies for 3/16", 1/4", 5/16", and 3/8" tubing, providing ultimate versatility for brake, fuel, and transmission cooler lines. Constructed from premium materials like 40Cr and 42CrMo, it is built for tough jobs. The included cutter and deburring tool ensure a clean setup for flaring.

Product Details

Pros

• Supports 37° and 45° angles
• Works on multiple tubing sizes
• Creates single, bubble, and double flares
• Includes cutter and deburring tool

Cons

• Not suitable for stainless steel pipes.

An excellent choice for professionals and hobbyists working on various automotive lines requiring precise flares. It is not designed for use on stainless steel tubing.

4. Lisle 33260 Double Flaring Tool Kit – 3/16″ and 1/4″

Best for: Tight space flaring.

Flaring tubing in tight spaces is made easy with this low-profile double flaring tool kit. It creates single or double flares on both 3/16" and 1/4" tubing, ensuring precise results.

The vise assembly securely holds tubing centered without marring, while the depth stop ensures proper tubing length for consistent flares. This kit includes dies for 3/16" and 1/4" tubing, a forming die, and an internal deburring tool, all housed in a convenient case for transport and storage.

Product Details

Pros

• Low profile design for tight spaces
• Creates single or double flares
• Works on 3/16" and 1/4" tubing
• Vise assembly holds tubing securely

Cons

• Does not work on stainless tubing.

Ideal for automotive repairs in confined areas, this kit is suitable for 3/16" and 1/4" non-stainless tubing. It is not designed for use with stainless steel materials.

5. Professional Brake Line Flaring Tool Kit for 45 Degree Single, Double and Bubble Flares, 3/16″, 1/4″, 5/16″, 3/8″ and 4.75mm Steel Copper Metal Tubing, Black

Best for: Professional line flaring.

Create professional 45-degree single, double, and bubble flares on various metal tubing with this comprehensive brake line flaring tool kit. It supports multiple tubing sizes and materials for diverse applications.

This kit is designed for 3/16", 1/4", 5/16", and 3/8" O.D. lines, working with stainless steel, steel, and soft metal tubing. The tool requires clamping by a reliable vise for secure operation. It includes 4 sets of die blocks to accommodate different tubing dimensions and flare types.

Product Details

Pros

• Creates 45-degree single, double, and bubble flares
• Works on stainless steel, steel, and soft metal
• Supports multiple tubing sizes (3/16" to 3/8")
• Includes 4 sets of die blocks

Cons

• Must be used with a vise; not suitable for under-car use.

A professional-grade tool for creating precise flares on a range of tubing materials and sizes. Ensure you have a sturdy vise available, as it cannot be used directly under a vehicle.

6. Brake Line Flaring Tool Kit, 3/16″, 1/4″, 5/16″, 3/8″ and 1/2” Double & Single Tubing Flare Tool for Copper and Aluminum Fuel Line Tube

Best for: Copper and aluminum line flares.

Create 45-degree double or single flares in copper, aluminum, magnesium, soft steel brake lines, and brass tubing with this versatile flaring tool set. It is designed for various applications and includes essential accessories.

This set includes a flaring cone, flaring bar, tube cutter, and five adapters, all organized in a blow-molded case for easy transportation and storage. The flaring bar and forged yoke are constructed for durability, ensuring reliable performance for your flaring needs.

Product Details

Pros

• Creates 45-degree double or single flares
• Works on copper, aluminum, and soft steel
• Includes tube cutter and adapters
• Comes with a blow-molded case

Cons

• Not applicable with hard materials like steel or iron.

Suitable for DIYers and mechanics working with copper and aluminum fuel lines or soft steel brake lines. It is not designed for use on harder metals like steel or iron.

7. DPTOOL Brake Line Flaring Tool Kit for 45 Degree Single Double Bubble

Best for: Stainless steel line flaring.

Produce high-quality, accurate 45-degree single, double, and bubble brake flares on 304 stainless steel, steel, and soft metal tubing quickly with this multi-functional flaring tool. It ensures no subsequent leaks in hydraulic or brake lines.

This benchtop tool must be used with a vice, making it ideal for workshop environments. It is designed for creating precise flares on various tubing types, ensuring reliability for both DIY enthusiasts and professional mechanics. Its multi-functional design covers a range of flaring needs.

Product Details

Pros

• Works on 304 stainless steel tubing
• Creates 45-degree single, double, and bubble flares
• High quality and accuracy
• Suitable for DIY or mechanic use

Cons

• Must be used with a vice; not for portable use.

An essential tool for mechanics and DIYers needing to flare stainless steel and other tubing types accurately. It requires a vise for operation and is best suited for bench work.

8. DPTOOL Hydraulic Brake Line Flaring Tool Kit Universal Brake Flaring Tool

Best for: Universal hydraulic line flaring.

This multi-functional hydraulic brake line flaring tool creates a variety of flares, including 45° double & single, push connect, GM fuel line, ISO bubble, and GM transmission cooling line flares. It works on stainless steel, steel, and soft metal tubing.

Engineered for high quality and accuracy, this tool produces flares that prevent leaks in hydraulic or brake lines. Its universal application covers numerous flare types, making it a comprehensive solution for automotive and hydraulic system repairs. The hydraulic operation ensures consistent pressure for reliable results.

Product Details

Pros

• Creates multiple flare types (double, single, bubble, etc.)
• Works on 304 stainless steel tubing
• High quality and accuracy
• Hydraulic operation for consistent flares

Cons

• Requires hydraulic fluid and operation, not a manual tool.

A versatile hydraulic tool for professionals and advanced DIYers needing to create various precise flares on stainless steel and other tubing. Ensure proper hydraulic fluid and operation for best results.

9. Brake Line Flaring Tool Kit, Double Flare Tool & Bubble Flare Tool

Best for: Automotive line repair.

Simplify creating standard 45-degree single, bubble, and double flares on tubing with this professional brake line flaring tool kit. It works perfectly for brake, transmission cooler, and fuel lines, cutting down working time.

This kit is compatible with 3/16", 1/4", 5/16", and 3/8" diameter tubes made of soft metals like copper and aluminum. The robust metal construction ensures accurate forming, and the kit contains complete supporting dies and accessories. A rotary die allows for easy selection of different flaring processes.

Product Details

Pros

• Creates single, bubble, and double flares
• Works on 3/16" to 3/8" diameter tubes
• Suitable for copper and aluminum
• Robust metal construction

Cons

• Not explicitly stated to work on stainless steel.

A reliable choice for car, truck, and custom build projects needing precise flares on soft metal tubing. It is ideal for basic brake line repairs and custom fuel system work, but compatibility with stainless steel is not specified.

10. Capri Tools 1/4 in. Double Flaring Tool

Best for: 1/4 in. tubing flares.

Create high-quality 45-degree SAE double flares on 1/4 in. tubing in half the time with this compact and portable double flaring tool. It works flawlessly with non-stainless steel, nickel, and copper tubing for efficient repairs.

This alloy steel and copper tool's compact design allows for perfect double flares both off and on the vehicle, even in tight spots. The detachable die enables use with a bench vise. Its dimensions of 4.6 x 1.6 x 1.16 inches and weight of 6.4 ounces make it a lightweight option for various repair scenarios.

Product Details

Pros

• Creates 45-degree SAE double flares
• Works on 1/4 in. tubing
• Compact and portable design
• Detachable die for bench vise use

Cons

• Not suitable for stainless steel tubing.

Ideal for mechanics and DIYers needing to repair 1/4 in. brake lines on or off the vehicle. Ensure tubing material is compatible, as it is not designed for stainless steel.

What Buyers Often Overlook

Tubing size and material compatibility

Choose the tool by tubing outside diameter and material before comparing accessory counts. Capri Tools offers dedicated 3/16-inch and 1/4-inch tools, while Lisle covers both 3/16-inch and 1/4-inch tubing. Orion Motor Tech, SEEKSELF, TUBPRO, DPTOOL, and Fanmoss list broader capacities, including combinations of 3/16, 1/4, 5/16, and 3/8-inch tubing; TUBPRO also lists a 1/2-inch adapter.

Material limits differ substantially. Capri specifies non-stainless steel, nickel, and copper tubing, and Titan is not recommended for stainless steel.

Orion excludes stainless steel, while Lisle excludes stainless tubing. TUBPRO is intended for copper, aluminum, magnesium, soft steel, and brass, but excludes hard materials such as steel and iron. SEEKSELF and DPTOOL list stainless compatibility.

Confirm the actual line material and diameter before forming a flare, because a matching die does not override a manufacturer’s material restriction.

The Key Product Trade-Off

On-vehicle access versus bench control

The main trade-off is portability versus the stability of a vise-mounted tool. Capri Tools and Titan use compact designs intended for repairs in tight under-car spaces, so they suit replacing or repairing a short brake-line section without removing the entire line. Capri’s detachable die can also be used with a bench vise, adding flexibility.

Lisle’s low-profile design is intended for tight spaces and includes a vise assembly that centers tubing securely, plus a depth stop. In contrast, SEEKSELF explicitly requires a reliable vise and is not suitable for use under the car; DPTOOL also requires a vise.

The larger Orion Motor Tech, TUBPRO, Fanmoss, and hydraulic DPTOOL kits are better aligned with controlled bench work and repeated multi-size forming. Select an on-vehicle design for access problems, or a vise-based kit when alignment, capacity, and repeatability matter more than portability.

Best Double Flare Tool: Buyer's Guide

Fit, Dimensions, and Compatibility

Compare the listed dimensions with the intended counter, cabinet, appliance, storage, or installation space. Confirm model compatibility and connection requirements where they are supplied. A useful feature cannot compensate for a product that does not physically fit or work with the buyer’s existing setup.

Capacity, Output, and Operating Format

Match listed capacity, volume, output, and operating mode to the actual household or work routine. Larger figures can support heavier use, while a smaller format may be easier to place and maintain. Treat daily output, immediate storage, and container capacity as separate specifications when the listing distinguishes them.

Materials, Construction, and Care

Use the listed materials and care instructions to judge cleaning effort, storage conditions, and compatibility with the intended use. Dishwasher, freezer, food-contact, or weather-related claims are included only when supplied for that product. Check whether routine care fits the way the product will be used.

Included Components and Setup Needs

Review the included components before planning installation or first use. Hoses, adapters, lids, paddles, bowls, brushes, controls, and manuals vary by listing. Confirm power, water, assembly, or accessory requirements from the supplied product information rather than assuming that separately pictured parts are included.

Which Should You Choose?

Choose Capri Tools 3/16 in. Double Flaring Tool (CP21110-316) when most repairs use 3/16-inch tubing and you need a compact tool for tight on-vehicle work; choose Capri Tools 1/4 in. Double Flaring Tool for the same use with 1/4-inch lines.

Titan’s 3/16-inch model suits users who want a removable handle and included punch and lubricant. Choose Lisle for 3/16- and 1/4-inch work with a low-profile vise assembly and depth stop.

Orion Motor Tech, TUBPRO, and Fanmoss fit broader tubing and flare needs. SEEKSELF and standard DPTOOL are bench-only choices, while DPTOOL’s hydraulic kit suits users needing several specialized flare types, including push-connect, GM, ISO bubble, and hydraulic-line flares.

Quick Buying Checklist

• Confirm the complete dimensions against the available space.
• Verify model, accessory, connection, and appliance compatibility.
• Match capacity or output to the expected amount of use.
• Compare materials and care instructions with the maintenance routine.
• Check the included components before planning setup or first use.
• Confirm listed power, water, storage, or installation requirements where applicable.

Frequently Asked Questions

What is a double flare tool used for?

A double flare tool is essential for creating secure, leak-proof flares on brake and fuel lines. It’s used to form a secondary lip on the tubing, which provides a stronger seal when connecting to fittings, crucial for automotive and hydraulic systems.

What materials can double flare tools work with?

Most double flare tools are designed to work with soft metals like copper and aluminum tubing. Some heavy-duty kits can also handle steel brake lines, but it’s important to check the tool’s specifications to ensure compatibility and avoid damage.

Are there different types of flares?

Yes, the most common types are single flares, double flares, and bubble flares. Double flares are standard for brake lines in many vehicles, offering superior strength. Bubble flares are often used in European automotive applications for their sealing capabilities.

How do I choose the right size tubing for my tool?

Ensure the double flare tool you select accommodates the specific outer diameter of the tubing you are working with. Common sizes include 3/16, 1/4, and 5/16. Always verify the tool’s listed compatible tubing sizes before purchase.

What is the difference between a manual and hydraulic flaring tool?

Manual flaring tools require physical force to operate the flaring die. Hydraulic flaring tools use hydraulic pressure to create the flare, requiring less physical effort and often producing more consistent results, especially for harder materials or larger tubing.

Final Words

Selecting the right double flare tool depends on your specific needs, whether it’s for a particular tubing size, a range of sizes, or different flare types. For general automotive repairs, a versatile kit handling common sizes and angles is often the most practical choice. Ensure the tool is compatible with your tubing material for reliable results.