DPTOOL Brake Line Flaring Tool Kit — 37° & 45° Bench-Mounted, Heat-Treated Steel

DPTOOL Brake Line Flaring Tool Kit is a bench-mounted, professional-grade flaring set that makes accurate 37° and 45° single, double and bubble flares on steel, stainless and soft metal tubing.

This compact kit gives DIYers and mechanics a durable, repeatable way to form leak-resistant flares for brake lines, fuel lines and transmission cooler lines. Built from heat-treated steel with rotating die heads for both 37° and 45° flares, the tool clamps in a vise and converts standard tubing into correctly profiled fittings used in many automotive and hydraulic systems. The set includes split dies for common diameters, a lever handle, reaming/reamer cones, and a molded carrying case so you can store and transport the kit safely.

How does this tool make different types of flares (single, double, bubble)?

The DPTOOL kit uses a rotating die head and a sequence of reaming cones to form each flare type. You change positions on the die head and use the numbered cones OP.0, OP.1 and OP.2 in the prescribed order to produce single, double or bubble flares reliably.

• Single flare: set die head to OP.0 then OP.2, press with reamer as instructed.
• Bubble flare: use OP.0 then OP.1 to form the rounded bubble profile.
• Double flare: follow OP.0 → OP.1 → OP.2 sequence for a folded double lip.
• Use a vise-mounted base for consistent alignment and repeatability.

What tube sizes and materials will this flaring tool work with?

This kit covers the most common automotive tubing diameters and handles a range of materials. It ships with split dies sized to fit both imperial and metric lines used in brakes, fuel and transmission systems.

• Included split dies: 3/16" (4.75mm), 1/4" (6.35mm), 5/16" (8mm), 3/8" (9.5mm) and a 6mm die.
• Compatible materials: 304 stainless steel, regular steel and softer metal tubing.
• Appropriate for brake, transmission cooler and fuel lines in most vehicles.
• Requires bench vise mounting for secure, accurate flares.

How durable and precise is the DPTOOL flaring kit?

The tool body and components are heat-treated and oxidized for hardness and wear resistance, delivering consistent flare quality over repeated use. The rotating die heads and split dies are engineered to maintain concentric alignment so flares seat properly and minimize the risk of leaks when installed correctly with fittings.

• Heat-treated steel construction for long service life.
• Oxidized finish for corrosion resistance and reduced galling.
• Rotating 37° and 45° die heads for common flare standards.
• Precision split dies for tight fit and uniform flaring.

What steps and tips improve flare quality and safety?

Preparation matters: deburr tubing, apply a small amount of anti-seize, and add light oil to the reaming cones. Always clamp the tool in a vise on a stable bench and follow the die head sequence for the flare type you need.

• Deburr inside and outside of cut tubing to remove metal shavings.
• Apply anti-seize to tube ends to avoid galling during compression.
• Lubricate OP.1 and OP.2 cones lightly for smoother forming.
• Confirm flared end faces outward when fitting; inspect for cracks or uneven lips.

Who is this for: The DPTOOL Brake Line Flaring Tool Kit is aimed at home mechanics, restoration enthusiasts and professional technicians who need a bench-mounted flaring solution for automotive brake, fuel and transmission lines. If you work on classic cars, perform brake system repairs, or fabricate custom hard-lines and want predictable, workshop-grade 37° and 45° flares with a portable kit, this set provides the dies, reamers and hardware to produce repeatable, service-quality results.