What is an inverted flare
John Johnson
Updated on April 20, 2026
What’s inverted flare? Inverted Flare Hydraulic Fittings are widely used in hydraulic brake, power steering, fuel lines and transmission cooler lines. Inverted flare fittings are inexpensive and reusable. Inverted flare provides excellent vibration resistance. Seats and threads are internal and protected.
What are inverted flare nuts for?
Inverted Flare Tube Fittings Particularly Well-Suited For Hydraulic Brake Systems, Fuel Equipment, And Refrigeration Applications. Seats And Threads Are Recessed And Protected. Short Nuts Affords Very Close Tube Bends. Used With Copper , Brass, Aluminum, And Steel Hydraulic Tubing Or Ste El Lines That Can Be Flared.
Is inverted flare bubble flare?
The SAE/double (inverted/45degree) flare and the DIN/ISO bubble flare. We will refer to them as SAE or DIN flare. The most common is the SAE flare. … If your brake line looks like a tiny funnel going into the ID of the tubing, and the back side of the flare is at a 45 degree angle, then it is the SAE flare.
What angle is inverted flare?
In the first image above, the SAE double inverted flares are considered to have a 45 degree angle – this angle matches the female end of the fitting, whereas the male end has a 42 degree angle. During assembly, as the tube nut is tightened, the male end deforms to match the angle of the female end.Will single flare work on brake lines?
1. Single Flares are only acceptable on low-pressure lines, but not acceptable for high-pressure brake systems. A single flare is just as it sounds, the line is flared out just once in a conical shape. Single flares are not acceptable for brake lines and tend to crack and leak quite easily.
What does SAE stand for in hydraulic fittings?
NPTFNational Pipe Tapered FuelSAESociety of Automotive EngineersJICJoint Industrial CouncilNFPANational Fluid Power AssociationBSPBritish Standard Pipe
What is a standard flare?
The most common flare fitting standards in use today are the 45° SAE flare, the 37° JIC flare, and the 37° AN flare. SAE 45° flare connections are commonly used in automotive applications as well as for refrigeration and air conditioning. SAE fittings are typically made from brass.
Is JIC and flare the same?
JIC fittings are dimensionally identical to AN (Army-Navy) fittings, but are produced to less exacting tolerances and are generally less costly. SAE 45-degree flare fittings are similar in appearance, but are not interchangeable, though dash sizes 2, 3, 4, 5, 8, 10, 14, and 16 share the same thread size.Is inverted flare same as double flare?
The first is the inverted double flare, used by most domestic production cars and trucks. … It uses a 45* double flare to seal, which has tubing that is folded over into itself before flaring outward. The double flare is used for installations that require repeated tightening/untightening.
What degree flare are an fittings?Fitting Flare Angle AN Aircraft Flare fittings have a 37 degree flare angle. Many industrial fittings use a 45 degree flare angle.
Article first time published onWhat is inverted male flare?
Inverted Flare Hydraulic Tube Fittings Recommended or use in hydraulic brake, power steering, fuel lines and transmission cooler lines. Inverted flare fittings are inexpensive and reusable. Inverted flare provides excellent vibration resistance. … Short nut (available in brass or steel) allows very close tube bends.
What type of flare is used mostly in the United States?
The most common type of flare you’ll find on domestic and street rod applications is a 45-degree double flare. The double flare is used on high pressure circuits like the brake and clutch system.
Is a single flare as good as a double flare?
The single flare is very identical to the double flare. Although they look a lot alike, the double flare is much stronger and can hold more pressure build up inside the braking system. The double flare is a flare that is especially popular in vehicles imported from Europe.
Are brake lines single or double flare?
All brake lines need to be double flared, due to the high hydraulic pressure. If your brakes leak or the hoses crack, it could prove to be fatal. Single flared lines are suitable for low-pressure lines in other applications, but not your vehicle’s brakes.
Are compression fittings NPT?
The fittings we sell may have compression or National Pipe Thread tapered ends (NPT). Compression ends are made for a tube which has a specific outside diameter (OD). For example, a ¼” compression fitting is designed to connect a section of tubing which has an OD of ¼”.
Do you have to flare compression fittings?
When any level of leakage is an issue (gas and high-pressure lines, for example), use flare fittings. When slight levels of leakage won’t cause too much of a problem (water and compressed air lines, for example), use flareless fittings.
What is the difference between flare and compression fittings?
Generally speaking, compression outlets are used for water and compressed air lines, where slight leakage isn’t going to cause too much of a problem. Flared outlets are used for gas and high-pressure lines, where even a little leakage can cause major problems if left unattended.
What is a flare valve?
A gas flare, also known as a flare stack, is a gas combustion device used in industrial plants such as petroleum refineries, chemical plants and natural gas processing plants. … A flare system from a pressurized source may include a control valve, collection piping, flashback protection, and a gas outlet.
How do flare fittings seal?
Design: The 37° flare AN seal is used for sealing tubing to end connections. It requires the end of the tube to have a nut slipped onto it and then flared out using a special tool. To seal properly, the nut is threaded into a flare fitting which clamps the flared tube in between the nut and flare fitting.
What is a tubing flare?
A flare fitting is a type of compression fitting used when working with metal tubing. They are commonly made from soft steel and copper, but can originate from other materials as well. Tube flaring is considered to be a type of forging operation, and is usually a cold working procedure.
What is JIC in hydraulic fittings?
JIC (or Joint Industry Council) fittings, defined by SAE J514, are compression fittings machined with a 37 degree flare seating surface and parallel threads. They are commonly manufactured in nickel alloys, brass, carbon & stainless steel. JIC Fitting hydraulic connections are common in most fluid power systems.
Is NPT the same as SAE?
What’s the difference between SAE & NPT threads? The biggest difference is SAE is a straight thread, it needs additional O-ring, gasket or sealing surface to form a seal; NPT thread is a taper thread, it can form a seal using its thread pitch.
Are SAE and ORB the same?
O-Ring Boss: The threads of the SAE straight thread O-Ring Boss (ORB) and the straight thread 37⁰ JIC Flare are the same threads. The difference is the way each thread seals. While the JIC seals on a metal-to-metal flare, the ORB seals on an O-ring, which offers the best leak free connection.
What does NPT stand for in threads?
The best known and most widely used connection where the pipe thread provides both the mechanical joint and the hydraulic seal is the American National Pipe Tapered Thread, or NPT. NPT has a tapered male and female thread which seals with Teflon tape or jointing compound.
Can you mix JIC and an fittings?
JIC Steps In The majority of the hydraulic population agrees, the JIC (or SAE) 37 degree fittings are generally interchangeable with AN fittings.
What are 37 degree flares used for?
37° flare fittings perform well in severe applications where vibration, high pressure, and thermal shock exist. The flare fitting sleeve insures tube alignment with the fitting body axis and minimizes mechanical strain on the tube.
What the difference between 37 and 45 degree flare?
JIC 37 degree flare union fittings is in most hydraulic systems in high pressure application such hydraulic excavator, loader and tractor etc. SAE 45 degree flare fittings is used in low to medium pressure applications such as military and aerospace equipment. they doesn’t interchangeable into each other.
Are propane fittings NPT?
Hose Coming Out of Regulator The hose coming out of your regulator and bringing propane to your appliances will usually have a 3/8″ NPT fitting. The female end is located on the regulator, and the male end is located on the supply hose.