Best Double Flaring Tool For Stainless Steel Tubing

#1 · Best Overall

1. DPTOOL 45 Degree Kit

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

Best for: Bench-based stainless brake repairs.

Why it ranks #1: Explicitly supports 304 stainless steel and makes 45-degree double flares; its vise-only setup suits accurate bench work.

Support for 304 stainless steel is the DPTOOL kit’s key distinction: it can form 45-degree single, double, and bubble flares, giving brake-line and hydraulic-line repairers several flare styles in one tool. Its stated need for a vise makes it a bench-work choice, rather than an under-vehicle solution.

The ability to form three flare types on 304 stainless steel, steel, and soft metal tubing lets a mechanic use one kit across several listed materials and connection styles. Its vise requirement establishes a firm installation workflow: secure the tool on a bench before flaring, rather than trying to work beneath a vehicle. The supplied information gives no tubing-size range, so buyers should compare their line dimensions with the kit’s included tooling before choosing it for a specific repair.

Skip it if you need to flare a line while it remains under the vehicle; Clatoon’s Brake Line Double & Single Flaring Tool Kit is listed for tight under-car spaces.

Choose this DPTOOL kit for bench-based brake or hydraulic-line work when 304 stainless compatibility and multiple 45-degree flare styles matter. Its vise-only workflow rules it out for flaring in place beneath a vehicle.

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

#2 · Broad Size Range

2. SEEKSELF Professional Kit

• Weight: 11.33 lb
• Package Dimensions: 13.23 x 10.28 x 3.5 in

Best for: Multi-size stainless bench fabrication.

Why it ranks #2: Lists stainless steel compatibility, 37- and 45-degree double flares, and four tubing sizes from 3/16 to 3/8 inch.

Four die-block sizes let the SEEKSELF kit work with 3/16-, 1/4-, 5/16-, and 3/8-inch lines, while its stated material range includes stainless steel. It also forms 37- and 45-degree single, double, and bubble flares, covering varied bench-based line fabrication.

The four die-block sizes span several common line diameters, which gives a repairer more flexibility across the listed tubing range without changing kits. Its ability to make both 37- and 45-degree single, double, and bubble flares supports different connection requirements, and stainless steel is explicitly included among compatible materials. The tool must be clamped in a reliable vise and is not suitable for use under a car, so plan for secured bench work.

Skip it if you need to flare tubing beneath a vehicle; Clatoon’s Brake Line Double & Single Flaring Tool Kit is listed for tight under-car spaces.

This SEEKSELF set suits a bench-equipped mechanic handling stainless lines in several listed diameters and needing both 37- and 45-degree flare styles. Its vise mounting and under-car restriction define where it can be used.

Listed on Amazon as: Professional Brake Line Flaring Tool Kit for 45 & 37 Degree Single, Double and Bubble Flares, 3/16", 1/4", 5/16", 3/8" and 4.75mm Steel Copper Metal Tubing

#3 · Dual Angle Choice

3. LainKeen Dual Degree Kit

• Weight: 11.09 lb
• Package Dimensions: 14.76 x 11.57 x 4.45 in

Best for: Dual-angle stainless line fabrication.

Why it ranks #3: Explicitly supports stainless steel and both 37- and 45-degree double flares across four sizes, from 3/16 to 3/8 inch.

Two flare angles and four tubing sizes give the LainKeen kit a broad stainless-steel repair scope: it makes 37- and 45-degree single, bubble, and double flares on stainless, steel, and soft metals. The listed sizes span 3/16 to 3/8 inch.

The 37- and 45-degree capability supports different line-connection requirements, while single, bubble, and double flare options broaden the listed fabrication tasks. Four sizes—3/16, 1/4, 5/16, and 3/8 inch—cover the kit’s stated range for brake, transmission-cooler, and fuel lines. Stainless steel is explicitly included, alongside steel, copper, and aluminum. Those size limits define the fit; tubing outside the stated range is not covered by the supplied details.

Skip it if you need a listed die larger than 3/8 inch for stainless work; SEEKSELF’s Professional Brake Line Flaring Tool Kit includes a 3/8-inch maximum as well, so check another suitable range.

This LainKeen kit suits brake, transmission-cooler, or fuel-line work requiring stainless compatibility and either 37- or 45-degree flare styles. Its listed tubing range ends at 3/8 inch, a key fit boundary.

Listed on Amazon as: LainKeen Brake Line Flaring Tool Kit for 45 and 37 Degree Flares

#4 · Hydraulic 37-Degree

4. Mastercool 72480 Kit

• Weight: 8 lb

Best for: AN and light-stainless fabrication.

Why it ranks #4: Works with light stainless steel and makes 37-degree double flares for AN fittings; it does not list 45-degree doubles.

Hydraulic operation and compatibility with light stainless steel distinguish the Mastercool 72480 for 37-degree AN flare work. It fabricates 37-degree and 37-degree double flares for aviation, motorsports, and specialty automotive applications, making connection type as important as its stainless capability.

The hand-held hydraulic pump operates with steel and light stainless tubing, providing the force mechanism for the kit’s stated specialty fabrication tasks. Its 37-degree and 37-degree double-flare capability matches AN applications identified for aviation, motorsports, and high-performance automotive work. The supplied facts also mention 45-degree and double-flaring dies and adapters, plus GM transmission cooling-line dies and adapters. The stainless claim is specifically for light stainless, not all stainless tubing.

Skip it if you need stainless compatibility beyond light stainless; DPTOOL’s Brake Line Flaring Tool Kit for 45 Degree Single Double Bubble lists 304 stainless tubing.

Choose Mastercool for 37-degree AN work on aviation, motorsports, or specialty automotive lines, including light stainless tubing. Its listed stainless scope is light stainless, so confirm the tubing type suits that boundary.

Listed on Amazon as: Mastercool 72480 Hydraulic 37 deg Flaring Tool Kit

#5

5. Clatoon Flaring Kit

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

Best for: Under-vehicle multi-size line work.

Why it ranks #5: Includes five dies covering 3/16 to 1/2 inch and a tubing cutter, but its stated materials do not confirm stainless compatibility.

A compact design enables the Clatoon kit to make single or double flares in tight under-car spaces, a useful distinction for in-place repair. Its five listed die sizes run from 3/16 to 1/2 inch, though the supplied facts do not list stainless-steel compatibility.

The five dies cover 3/16-, 1/4-, 5/16-, 3/8-, and 1/2-inch tubing, giving the kit a broad stated size range for line work. A tubing cutter is included, so cutting and flaring tools come together in the set. The forged yoke and chrome swivel are described as high-strength and friction-reducing, respectively. Stainless compatibility is not specified in the supplied facts, so that material should not be assumed suitable.

Skip it if you require explicitly listed stainless compatibility; DPTOOL’s Brake Line Flaring Tool Kit for 45 Degree Single Double Bubble lists 304 stainless tubing.

This Clatoon set fits mechanics who need multiple die sizes, an included cutter, and access for under-car single or double flares. The supplied details do not establish stainless compatibility, an important boundary for this roundup.

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

#6

6. DASBET Flaring Kit

• Weight: 2.64 lb
• Package Dimensions: 9.02 x 7.95 x 1.93 in

Best for: Soft-steel and multi-size repairs.

Why it ranks #6: Offers five sizes through 1/2 inch and a cutter, but lists soft steel rather than stainless steel among compatible tubing materials.

Five adapters and an included tubing cutter give the DASBET kit a broad setup for line preparation and flaring across 3/16- to 1/2-inch sizes. Its listed materials include copper, aluminum, brass, magnesium, and soft steel, but not stainless steel.

The five die sizes support several listed tube diameters, while the cutter handles 1/8- to 5/8-inch pipe, combining preparation and flare tooling in one kit. A high-strength heat-treated steel yoke and bar provide the stated durable construction, and the chrome-plated cone is described as reducing friction. The listed materials stop at soft steel and other soft metals; stainless compatibility is not supplied, so do not treat it as established.

Skip it if you need expressly listed stainless compatibility; DPTOOL’s Brake Line Flaring Tool Kit for 45 Degree Single Double Bubble lists 304 stainless tubing.

DASBET suits line work across several listed soft-metal and soft-steel materials when an included cutter and multiple die sizes are useful. Its supplied material list does not establish stainless-steel compatibility.

Listed on Amazon as: DASBET Double and Single Brake Line Flaring Tool Kit with Tubing Cutter

#7 · Compact On-Vehicle

7. Capri Tools CP21110-316

• Weight: 12.8 oz

Best for: On-vehicle 3/16-inch repairs.

Why it ranks #7: Its compact design works on or off vehicle in tight spots, but the maker lists non-stainless tubing compatibility only.

Its compact form enables 3/16-inch 45-degree SAE double flares both on and off a vehicle, including in tight spots. The Capri Tools tool is specifically listed for non-stainless steel, nickel, and copper tubing, making its material boundary especially important for a stainless-steel roundup.

The detachable die lets the tool move between portable, on-vehicle work and use with a bench vise, so the setup can suit access conditions rather than requiring one fixed position. Its 3/16-inch sizing and 45-degree SAE double-flare function keep the task focused on a common brake-line format. The supplied tubing compatibility excludes stainless steel, however, so this tool is not suited to the roundup’s central stainless-tubing task.

Skip it if you need to flare stainless tubing; DPTOOL’s Brake Line Flaring Tool Kit for 45 Degree Single Double Bubble lists 304 stainless compatibility.

This Capri Tools option suits mechanics making 3/16-inch SAE double flares on non-stainless brake lines, especially where access is tight. Its stated tubing materials exclude stainless, so it does not meet a stainless-line requirement.

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

#8

8. Lisle 33260 Kit

• Weight: 1.8 lb

Best for: Tight-access non-stainless repairs.

Why it ranks #8: A low-profile design and depth stop support tight-space work, but the product explicitly does not work on stainless tubing.

A low-profile shape enables the Lisle 33260 to flare tubing in tight spaces, and its vise assembly holds the line centered without marring. It makes single or double flares on 3/16- and 1/4-inch tubing, but the manufacturer says it does not work on stainless.

The low-profile design helps when surrounding clearance is limited, while the vise assembly’s centered, non-marring hold supports controlled positioning of the tubing. A depth stop sets the tubing length for the forming step, and the included internal deburring tool supports line preparation within the supplied kit. Its 3/16- and 1/4-inch range and explicit stainless exclusion make it a focused choice for tight-access non-stainless work.

Skip it if you need to flare stainless steel; Mastercool’s 72480 Hydraulic 37 deg Flaring Tool Kit lists compatibility with light stainless tubing.

The Lisle 33260 suits non-stainless 3/16- or 1/4-inch line repairs where clearance is tight and controlled tubing positioning matters. Its explicit stainless limitation rules it out for the central task here.

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

#9

9. GEAROLL Double Flare Kit

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

Best for: Copper and nickel-copper repairs.

Why it ranks #9: Makes 45-degree doubles in 3/16- and 1/4-inch tubing, but its listed compatibility excludes stainless steel.

A clear stainless-steel exclusion is the key fact about the GEAROLL kit: it handles copper, aluminum, and nickel-copper tubing instead. For those softer brake-line materials, it makes 45-degree single, double, and bubble flares in 3/16- and 1/4-inch sizes.

The two supported tubing sizes focus the kit on 3/16- and 1/4-inch line repairs, while its three flare styles give users options for the listed brake and hydraulic-line tasks. Its stated compatibility with copper, aluminum, and nickel-copper helps identify suitable work before setup. GEAROLL specifically warns against stainless tubing because the material is too hard, so this is a soft-metal alternative rather than a stainless-steel flaring choice.

Skip it if you need to flare stainless lines; DPTOOL’s Brake Line Flaring Tool Kit for 45 Degree Single Double Bubble lists 304 stainless compatibility.

Choose GEAROLL for 3/16- or 1/4-inch copper, aluminum, or nickel-copper brake and hydraulic lines requiring one of its listed flare styles. Its stainless-steel exclusion makes it unsuitable for stainless repairs.

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

#10

10. DPTOOL 3/16 and 1/4 Kit

• Weight: 1.5 lb
• Package Dimensions: 6.22 x 4.49 x 1.93 in

Best for: Soft-metal SAE line work.

Why it ranks #10: Makes 45-degree doubles in two common sizes, but its product details explicitly say it is not suitable for stainless tubing.

The explicit exclusion of stainless steel defines this DPTOOL kit: it makes 45-degree single, double, and bubble flares on copper, aluminum, and nickel-copper tubing instead. That combination serves soft-metal brake-line work, but it cannot handle the stainless-tubing task at the center of this roundup.

Its listed flare choices cover single, double, and bubble connections, while the stated copper, aluminum, and nickel-copper compatibility identifies the tubing materials it can process. Together, those details make the kit a focused option for soft-metal brake or hydraulic-line work where the appropriate flare style matters. DPTOOL specifically says stainless tubing is unsuitable because the material is too hard, so choosing it for stainless repairs would conflict with the stated limitation.

Skip it if you need stainless-steel flare work; DPTOOL’s Brake Line Flaring Tool Kit for 45 Degree Single Double Bubble lists 304 stainless compatibility.

Pick this DPTOOL kit for copper, aluminum, or nickel-copper tubing when single, double, and bubble flare options are useful. Its stated stainless-steel exclusion makes it the wrong fit for stainless brake-line fabrication.

Listed on Amazon as: DPTOOL Brake Line Flaring Tool Kit 3/16" 1/4" SAE Double Flare Tool