Best Double Flare Tool for Brake-Line Work

#1 · Best Overall

1. Capri Tools 3/16-Inch Tool

• Weight: 12.8 oz

Best for: Tight-space 3/16-inch repairs.

Why it ranks #1: Makes 45-degree SAE double flares in 3/16-inch non-stainless steel, nickel, and copper tubing, with a compact design for tight on-vehicle work.

The detachable die is the defining advantage of Capri Tools’ compact 3/16-inch double flaring tool: it lets you create 45-degree SAE double flares on or off the vehicle, and use the die with a bench vise. Its listed tubing compatibility covers non-stainless steel, nickel, and copper.

The compact 8.9-inch-long body is intended for work in tight spots, including on-vehicle brake-line repairs, while the detachable die adds a bench-vise option when the work is off the vehicle. Compatibility with 3/16-inch non-stainless steel, nickel, and copper gives a clear material and size range for the job. The setup uses two 10 mm locking screws and a positioning bolt to secure and position the tubing before forming, so keep those tools available.

Skip it if you need multiple tubing sizes or single and bubble flares; this tool is specified for 3/16-inch double flares.

Choose this Capri Tools model for 3/16-inch SAE double-flare work where access is tight and switching between on-vehicle and bench-vise setups matters. Its stated material range excludes stainless steel, and its listed size is limited to 3/16 inch.

Listed on Amazon as: Capri Tools 3/16 in. Double Flaring Tool (CP21110-316)

#2 · Best Under-Car Fit

2. Titan 51535 Flaring Tool

• Weight: 14.2 oz

Best for: In-place 3/16-inch brake repairs.

Why it ranks #2: Forms 3/16-inch inverted 45-degree SAE double flares in steel and nickel-copper tubing; its removable handle and compact design suit in-place repairs.

A removable handle and compact form let the Titan 51535 reach tight under-car spaces for 3/16-inch brake-line repairs, enabling an inverted 45-degree SAE double flare without taking the line to a bench. The tool is listed for steel and nickel-copper tubing, not stainless steel.

The included positioning bolt and double-ended OP1/OP2 punch provide the named setup and forming components for its 3/16-inch double-flare task, while the removable handle helps when working in restricted under-car space. The kit also includes Grand 66A die lubricant. Its material limit matters for job planning: steel and nickel-copper are specified, but stainless steel is not recommended. Keep the scope to the single listed tubing diameter and double-flare style.

Skip it if you need several tubing diameters or flare styles; this Titan tool is specified for 3/16-inch double flares.

Choose the Titan 51535 for in-place brake-line work when access is tight and the job calls for a 3/16-inch inverted SAE double flare. Avoid it for stainless tubing or repairs requiring another listed size or flare style.

Listed on Amazon as: Titan 51535 3/16-Inch Double Flaring Tool

#3 · Best Two-Size Kit

3. Lisle 33260 Double Flaring Kit

• Weight: 1.8 lb

Best for: Low-profile 3/16- and 1/4-inch work.

Why it ranks #3: Covers 3/16-inch and 1/4-inch tubing, with a low-profile design for tight spaces, a depth stop, and an included case.

A low-profile design lets the Lisle 33260 form flares in tight spaces, while its vise assembly holds tubing centered without marring it. It makes single or double flares on 3/16- and 1/4-inch tubing, with a depth stop to help set the tubing length consistently.

The low-profile body addresses restricted access, and the centered vise assembly secures the tube without marring it; together, those features suit careful work where positioning matters. Its depth stop helps set the proper tubing length before forming, while the included forming dies cover 3/16- and 1/4-inch sizes. An internal deburring tool is also included for preparing the tube. The listed material limitation is explicit: this kit does not work on stainless tubing.

Skip it if you need to flare stainless-steel tubing; Lisle explicitly excludes that material for this kit.

The Lisle 33260 fits users forming 3/16- or 1/4-inch single or double flares where access and accurate tube positioning matter. Its low profile and depth stop are useful boundaries to weigh, but stainless tubing is excluded.

Listed on Amazon as: Lisle 33260 Double Flaring Tool Kit – 3/16" and 1/4"

#4 · Best Size Range

4. Clatoon Flaring Tool Kit

• Weight: 2.57 lb
• Package Dimensions: 9.02 x 8.03 x 1.97 in

Best for: Multi-size under-car flare work.

Why it ranks #4: Includes dies for five sizes from 3/16 inch to 1/2 inch and is described for single or double flares in tight under-car spaces.

Five included dies cover tubing from 3/16 inch through 1/2 inch, giving the Clatoon kit a broader stated size range than single-size tools. Its package also includes a tubing cutter, and the compact design supports single- or double-flare work in tight under-car spaces.

The five dies cover 3/16-, 1/4-, 5/16-, 3/8-, and 1/2-inch tubing, helping users switch among those listed sizes with the same kit. The included cutter supports tubing preparation as part of the same workflow, while the forged high-strength steel flaring bar and yoke are described as corrosion resistant. A chrome swivel made from alloy steel reduces friction, supporting smoother tool operation during forming; the supplied facts do not specify compatible tubing materials.

Skip it if you need a confirmed tubing-material range before choosing a tool; this listing gives sizes but does not specify materials.

The Clatoon kit suits users who need several listed tubing sizes, a cutter, and the option to work in tight under-car spaces. Check the project’s material requirements against the product information, which does not state compatible tubing materials.

Listed on Amazon as: Clatoon Brake Line Double & Single Flaring Tool Kit with Tubing Cutter

#5

5. GEAROLL Flaring Tool Kit

• Weight: 2.38 lb
• Package Dimensions: 9.21 x 5.28 x 3.66 in

Best for: Copper and nickel-copper line work.

Why it ranks #5: Makes 45-degree SAE double flares on 3/16-inch and 1/4-inch copper, aluminum, and nickel-copper tubing, but is not for stainless steel.

Compatibility with copper, aluminum, and nickel-copper tubing makes the GEAROLL kit a focused option for softer line materials, while its two die sizes cover 3/16- and 1/4-inch tubing. It forms 45-degree SAE double, single, and bubble flares for brake or hydraulic-line maintenance.

The 3/16- and 1/4-inch capacity gives this kit a defined range for smaller brake and hydraulic lines, while its single, double, and bubble flare functions let one tool address different listed connection styles. The stated material guidance is especially important: copper, aluminum, and nickel-copper are supported, but stainless steel is explicitly excluded because it is too hard. Match both the tubing diameter and material to those limits before starting a repair.

Skip it if you work with stainless-steel lines; the manufacturer explicitly says this tubing is too hard for the tool.

Pick the GEAROLL kit for brake or hydraulic-line work using its supported copper, aluminum, or nickel-copper materials in 3/16- or 1/4-inch sizes. Stainless-steel tubing falls outside its stated capability.

Listed on Amazon as: Brake Line Flaring Tool Kit, 3/16" 1/4" SAE Double Flare Tool for Brake Lines, Creates Single Double Bubble Flares for Vehicle Brake & Hydraulic Lines

#6

6. SEEKSELF Flaring Tool Kit

• Weight: 8.89 lb
• Package Dimensions: 14.29 x 6.38 x 3.46 in

Best for: Bench vise multi-flare projects.

Why it ranks #6: Offers four die sizes from 3/16 inch to 3/8 inch and single, double, and bubble flares; the instructions require vise mounting.

Four die-block sets give the SEEKSELF kit coverage across 3/16-, 1/4-, 5/16-, and 3/8-inch tubing, enabling several common line sizes to be flared with one kit. It forms 45-degree single, double, and bubble flares on stainless steel, steel, and some soft metals such as copper.

The four included die-block sets span four outside diameters, so a bench-based repair session can handle more than one listed tubing size without relying on a single-size tool. Single, double, and bubble flare capability also covers several 45-degree flare styles. The use instructions specify clamping the tool’s bottom securely in a reliable vise and say it is not suitable for use under a car; plan to remove the line and work at a bench rather than reaching into an installed assembly.

Skip it if you need to flare a line while it remains under the car; the instructions rule out that working position.

This SEEKSELF kit suits repairers who want several flare styles and four listed line sizes in a vise-mounted setup. It is a bench-work choice, not an option for forming a flare beneath a vehicle in place.

Listed on Amazon as: 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

#7

7. DPTOOL 45-Degree Kit

• Weight: 9.13 lb
• Package Dimensions: 14.41 x 6.46 x 3.54 in

Best for: Vise-mounted stainless-line work.

Why it ranks #7: Makes 45-degree single, double, and bubble flares on listed stainless steel, steel, and soft metal tubing, but requires a vise for bench use.

Support for 304 stainless steel alongside steel and soft-metal tubing distinguishes this DPTOOL kit for bench-based brake and hydraulic-line jobs. It forms 45-degree single, double, and bubble flares, bringing three flare styles together for users who can secure the tool in a vise.

The three listed flare styles—single, double, and bubble—make the kit applicable to different connection needs, while stated compatibility with 304 stainless steel, steel, and soft metals broadens its material coverage. That versatility comes with a firm setup requirement: the tool must be used with a vise, so the work belongs on a bench. Plan to remove or access the tubing at that station rather than expecting to flare a line in place under a vehicle.

Skip it if you need to flare an installed line beneath a car; this kit is restricted to vise-based bench use.

This DPTOOL kit fits mechanics or DIY users handling multiple flare styles, including work on listed 304 stainless tubing, at a secured bench. Its vise requirement rules out on-vehicle flaring in tight under-car spaces.

Listed on Amazon as: DPTOOL Brake Line Flaring Tool Kit for 45 Degree Single Double Bubble

#8

8. TUBPRO Flaring Tool

• Weight: 2.77 lb
• Package Dimensions: 9.25 x 9.21 x 2.09 in

Best for: Soft-metal multi-size tubing jobs.

Why it ranks #8: Includes five adapters covering 3/16 inch through 1/2 inch and forms 45-degree double flares, but its material guidance excludes hard steel and iron.

Five adapters span 3/16 inch to 1/2 inch, giving the TUBPRO kit a wide set of listed tubing sizes for 45-degree single and double flares. Its stated material range includes copper, aluminum, magnesium, soft steel, and brass, while excluding hard materials such as steel and iron.

The five adapters cover 3/16-, 1/4-, 5/16-, 3/8-, and 1/2-inch tubing, making the kit useful when a project includes several of those sizes. Its flaring cone and bar handle the stated single- and double-flare tasks, and the included tube cutter supports preparation before forming. A blow-molded case is supplied for transport and storage. Material selection is the key boundary: the listing limits use to softer metals and rules out hard materials such as steel and iron.

Skip it if you need to flare hard steel or iron tubing; this kit is specified for softer materials instead.

The TUBPRO kit suits users handling several listed diameters in copper, aluminum, magnesium, soft steel, or brass, with a cutter and case included. Its soft-material limit rules it out for hard steel or iron lines.

Listed on Amazon as: 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

#9

9. Orion Motor Tech Flaring Kit

• Weight: 10.34 lb

Best for: Dual-angle line-service projects.

Why it ranks #9: Dual 37- and 45-degree heads and four dies support several flare styles and sizes, though the product is not suitable for stainless steel pipes.

Rotating die heads provide both 37- and 45-degree angles, enabling the Orion Motor Tech kit to make single, bubble, and double flares for brake, fuel, and transmission-cooler lines. Four dies cover 3/16-, 1/4-, 5/16-, and 3/8-inch tubing, with stainless steel explicitly excluded.

The two rotating die heads let users select between 37- and 45-degree forming, and the listed single, bubble, and double flare options address several line-service tasks. Four dies cover four tubing sizes from 3/16 to 3/8 inch, while the included cutter and deburring tool support preparation before flaring. The manufacturer lists copper, aluminum, and other metal pipes as compatible but says the tool is not suitable for stainless steel, so material choice is a key fit check.

Skip it if you need to form flares in stainless-steel pipe; the listing explicitly rules out that material.

Choose the Orion Motor Tech kit for brake, fuel, or transmission-cooler line jobs needing two angles and several flare styles. Its four die sizes stop at 3/8 inch, and stainless-steel pipe is excluded.

Listed on Amazon as: OMT Brake Line Flaring Tool Kit, 45 & 37 Degree Bubble Double Flare Tool

#10

10. DPTOOL 37- and 45-Degree Kit

• Weight: 11.79 lb
• Package Dimensions: 13.3 x 10.24 x 3.5 in

Best for: Bench work across 37° and 45°.

Why it ranks #10: Adds 37-degree flares to its 45-degree capabilities, but requires a vise and its broad flare versatility is less focused on standard 45-degree brake-line work.

Two flare angles—37 and 45 degrees—set this DPTOOL kit apart for users who need more than standard 45-degree brake-line work. It makes single, double, and bubble flares on 304 stainless steel, steel, and soft-metal tubing, but requires a vise for bench-only operation.

The 37- and 45-degree capability offers two specified angles, while single, double, and bubble flare functions cover three styles for hydraulic or brake-line projects. The stated material range includes 304 stainless steel, steel, and soft metals. Since the tool must be used with a vise, the workflow centers on secure bench mounting rather than forming a flare beneath a vehicle. Its larger, 11.79-pound listed weight also makes it a substantial kit to move and store between jobs.

Skip it if you need to flare tubing under a vehicle without removing it; this tool must be used with a vise.

Choose this DPTOOL kit for bench users who need both 37- and 45-degree angles and the listed flare styles and materials. Its vise requirement and 11.79-pound weight make it less suited to mobile, in-place work.

Listed on Amazon as: DPTOOL Brake Line Flaring Tool Kit Professional 45 & 37 Degree Flare Tool