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Inverted Flare fittings have a reversed flared seat, creating a tight seal by compressing against the fitting nose. They are commonly used in automotive applications like brake lines and fuel systems and are made from brass or steel. Being cost-effective, easy to install, reusable,and high-pressure resistant, they are widely preferred.

45° Metric Female 24° Cone O-ring L.T. 20441
45° Metric Female 24° Cone O-ring L.T. 20441

Understanding Inverted Flares fittings

Inverted Flares fittings are used in a range of applications like hydraulic brake, power steering, fuel lines, transmission cooler lines, LP, and natural gas. They are favored for their excellent resistance to vibration and temperature, working effectively within a temperature range of -65 to +250 degrees Fahrenheit. The seating and threading for inverted flares are internal and protected, providing a very compact design with excellent vibration life.

Creating an Inverted Flare

The process of creating an inverted flare is similar to that of a single flare, with some key differences:

  1. Cut the tubing to the desired length and remove all burrs.
  2. Slide the nut on the tube, with the threaded end of the nut facing outwards.
  3. Create a 45-degree flare at the end of the tube using a flaring tool.
  4. Measure the flare diameter and check for thin-out.
  5. On thin wall, welded or brazed tubing, use a double flare to prevent pinch-off and cracked flares.
  6. Lubricate threads and assemble to fitting body.
  7. Hand-tighten the nut, then use a wrench until a solid feeling is encountered, followed by a one-sixth turn.
inverted flare fitting
inverted flare

Applications of Inverted Flare Fittings

Inverted flare hydraulic fittings are the go-to choice for various industries due to their cost-effectiveness and reusability. Their wide applications span from hydraulic brakes and power steering to fuel lines and transmission cooler lines. Their robustness makes them suitable for many tasks, which is why they are prevalent in several industries.

The Assembly of Inverted Flare Fittings

The assembly of inverted flares requires precision. The tubing needs to be cut to the desired length, ensuring all burrs are removed and the ends are cut square. The nut is then slid onto the tube, and the end of the tube is flared using a 45-degree flaring tool. The flared diameter is measured, and the flare is examined for excessive thinning. Once the flare is lubricated, it is assembled to the fitting body, tightened until a solid feeling is encountered, and then given an extra one-sixth turn. The whole process must be done carefully to avoid damaging the fitting or splitting the tubing at the flare.

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