Bonvoisin Flaring Tool for HVAC 1/4"–3/4" — 45° Single Flare, Eccentric Cone & Clutch

Bonvoisin Flaring Tool is a lightweight, aluminum-alloy single-flare tool that makes precise 45° single flares on 1/4"–3/4" copper and aluminum tubing using an eccentric cone, integrated clutch, and a tube-length limit piece.

This compact HVAC flaring tool is built for technicians and DIYers who need repeatable single flares for refrigeration, air-conditioning, and heating lines. Its eccentric hardened-steel cone creates a rolling metal flow for uniform flare walls while the built-in limit piece and clutch help control flare length and prevent overworking the fitting. The tool accepts common inch-size soft metal tubing and is optimized for portability and frequent field use.

How does the eccentric cone improve flare quality?

The eccentrically mounted hardened steel cone produces a rolling action that pushes material outward evenly, yielding consistent wall thickness around the flare. This design reduces uneven stretching and wear compared with straight cones, especially on softer tubing like copper and aluminum. Expect more uniform single flares and fewer rejects when preparing connection ends.

• Hardened steel cone for durable forming
• Rolling action ensures even metal flow
• Produces uniform 45° single flares across sizes

What do the clutch and limit piece do for speed and accuracy?

The integrated clutch in the rotating handle disengages automatically once the flaring cycle is complete, which reduces the risk of over-torquing and makes repeated operations quicker. The limit piece sets the tube protrusion precisely so each flare starts at the same position without constant measurement. Together they speed up repetitive work and improve consistency in a production or service environment.

• Clutch prevents over-rotation and handle strain
• Limit piece sets consistent tube insertion depth
• Reduces rework and measurement guesswork

Which tube sizes and materials are compatible?

This Bonvoisin flaring tool accepts inch-size soft metal tubing from 1/4" up to 3/4" outer diameter: 1/4", 5/16", 3/8", 1/2", 5/8", and 3/4". It is intended for single flares on copper and aluminum tubing typically found in HVAC, refrigeration, and related electrical systems. Note that it forms single 45° flares only and is not designed to create double flares.

• Compatible diameters: 1/4" to 3/4" (six sizes)
• Works with copper and aluminum soft tubing
• Single 45° flares only—no double-flare capability

How portable and durable is the tool for field work?

Constructed from an aluminum alloy frame with a hardened steel flaring cone, the tool balances light weight and long life. Weighing under 1 kg, it reduces operator fatigue during extended jobs and fits easily in a service bag. The absence of a rigid case keeps the unit compact, but users may want to store it in protective wrap for transport.

• Aluminum alloy body for lightweight handling
• Hardened steel cone for wear resistance
• Under 1 kg—suitable for mobile technicians

Who is this for: The Bonvoisin Flaring Tool is aimed at HVAC technicians, refrigeration installers, appliance service professionals, and capable DIYers who require a reliable, portable flaring solution for inch-size copper and aluminum tubing. It’s best when you need consistent 45° single flares on a range of common tube diameters, with features that speed repetitive work and limit operator error.