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There are two main types of flares: the JIC 37-degree flare and the SAE 45-degree flare. In this article, we’ll dive deep into the differences between these two types of flares and guide you in choosing the right one for your project.

The JIC 37-Degree Flare

The JIC 37-degree flare, defined by the SAE J514 and MIL-DTL-18866 standards, is a type of flare fitting that is machined with a 37-degree flare seating surface. The fitting is suitable for high-vibration environments as it is designed to perform well under severe applications such as vibration, high pressure, and thermal shock.These flare fittings can also be used as hose fittings.

JIC Female 74° Cone Seat SAE J514 26711
JIC Female 74° Cone Seat SAE J514 26711

The flare fitting sleeve in these fixtures ensures tube alignment with the fitting body axis, thereby minimizing mechanical strain on the tube. The construction of a 37-degree flare fitting is quite simple, which involves three components: the body, sleeve, and nut. The tube’s end is flared to a 74 degrees included angle and held between the body nose and the sleeve, with the nut on top, creating a highly effective seal.

JIC 37-degree flare
JIC 37-degree flare

Benefits Of 37 Degree Flare

  • They provide a tight seal that helps to prevent leaks.
  • They are less likely to loosen over time and become damaged.
  • The flared connection is stronger than other types of connections, making it ideal for high-pressure applications.
  • 37-degree flares are less likely to crack or break under stress.
  • They are less likely to corrode or become damaged by chemicals.

The SAE 45-Degree Flare

SAE 45-degree fittings are machined with a 45-degree flare seating surface and find common usage in automotive applications, military applications, and the oil and gas industry. The connections made by SAE 45-degree flare fittings are incompatible with AN/JIC connections due to the different flare angle. Typically made from steel and stainless steel, these fittings are renowned for their robustness and durability.

The only potential downside to using a 45-degree flare in low-pressure systems could be the excessive force required to create a seal due to its larger sealing area, which might not be necessary in low-pressure applications.

Benefits Of 45 Degree Flare

  • The tight seal of a 45-degree flare creates a stronger connection and is less likely to leak over time.
  • Easier to install in hard-to-reach places.
  • The tighter seal of the 45-degree flare means it is better able to withstand vibrations and movement.
SAE Thread With O-ring Seal 1CO/DO
SAE Thread With O-ring Seal 1CO/DO

How to choose: JIC 37-degree flare or SAE 45-degree flare?

The best choice would ultimately boil down to the application’s specific requirements.

A 37-degree flare’s ease of sealing and reliability make it a good choice for high-pressure applications, while a 45-degree flare’s enhanced sealing and sturdiness make it ideal for applications demanding more pressure tolerance and stability.

Remember, the choice you make will have significant impacts on the performance and longevity of your entire system. Therefore, always consider your system’s specific needs and choose wisely.

Can 37-degree and 45-degree flares interchangeably use in a single system?

It is generally not recommended to interchangeably use 37-degree and 45-degree flares in a single system due to their differing sealing areas and force requirements. However, the compatibility would largely depend on the specific requirements of your system.

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