Ameer Randolph
The angle of a fuel line flare is a matter of personal preference and experience. The two most common types are the 37-degree flare and the 45-degree inverted flare. The 45-degree inverted flare is an SAE (Society of Automotive Engineers) standard and is the most common style of flare used in automotive hard lines like brake, fuel, and transmission fluid transfer.
| Characteristics | Values |
|---|---|
| Most common | 45-degree inverted flare |
| SAE standard | 45-degree inverted flare |
| Single flare process | 37-degree flare |
| Double flare process | 45-degree flare |
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What You'll Learn
- The 45-degree inverted flare is the most common style for automotive hard lines
- The 37-degree flare is a single flare process that requires a tube sleeve to support the back side of the flare
- The 45-degree flare is an SAE standard and utilises an inverted flare fitting
- The 37-degree flare is more common with AN fittings
- The 45-degree flare is more common with stock components
The 45-degree inverted flare is the most common style for automotive hard lines
The 37-degree flare is also an option, but it is less common. This is a single flare process that requires a tube sleeve to support the back of the flare. It is also possible to use AN fittings, which are all 37 degrees.
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The 37-degree flare is a single flare process that requires a tube sleeve to support the back side of the flare
The 37-degree flare is often used with AN fittings, which are all 37 degrees. This style of flare may be more suitable for hard lines rather than flexible lines. When choosing between the 37-degree and 45-degree flare, it is important to consider the tools required for each process. The 37-degree flare tool can be mounted in a vice to aid in stability during use, while the 45-degree flare utilizes an inverted flare fitting with external or male threads.
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The 45-degree flare is an SAE standard and utilises an inverted flare fitting
The 45-degree flare is an SAE (Society of Automotive Engineers) standard. It utilises an inverted flare fitting, often shortened to 'IFF' when shopping for fittings. This fitting features external, or male threads. The 45-degree flare is created in a two-step process, creating a double-walled flare seat. This extra wall thickness means that a tube sleeve or flare seat support is not required. The 45-degree inverted flare is the most common style of flare used in automotive hard lines like brake, fuel, and transmission fluid transfer. It is also more common with stock components, so if you are restoring a vehicle and using stock brake components, a mechanical fuel pump, etc., this is the flare you should use.
The 37-degree flare is also an option, but it is less common. This is a single flare process that requires a tube sleeve to support the back side of the flare. Both styles of flares will get the job done, and it mainly comes down to personal preference and experience.
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The 37-degree flare is more common with AN fittings
The 37-degree flare is a single flare process that requires a tube sleeve to support the back of the flare. It is more common with AN fittings. The 45-degree flare, on the other hand, is an SAE (Society of Automotive Engineers) standard and is the most common style of flare used in automotive hard lines like brakes, fuel, and transmission fluid transfer. The 45-degree flare is also more common with stock components, so if you are restoring a vehicle and using stock brake components, a mechanical fuel pump, etc., this may be the better option.
When it comes to choosing between a 37-degree and a 45-degree flare, it ultimately comes down to personal preference and experience. Both styles will get the job done, and it is not a matter of which flare holds more pressure. However, it is worth noting that the 37-degree flare is a single flare process, while the 45-degree flare is a two-step process that creates a double-walled flare seat. This means that the 45-degree flare does not require a tube sleeve or any sort of flare seat support due to the extra wall thickness of the double flare.
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The 45-degree flare is more common with stock components
The 45-degree inverted flare is the most common style of flare used in automotive hard lines like brake, fuel, and transmission fluid transfer. It is an SAE (Society of Automotive Engineers) standard. The 45-degree flare is created in a two-step process, creating a double-walled flare seat. This style does not require a tube sleeve or any sort of flare seat support due to the extra wall thickness of the double flare. The 45-degree flare is more common with stock components, so if you are restoring a vehicle and using stock brake components, a mechanical fuel pump, etc, this is the flare you should use.
The 37-degree flare is a single flare process that requires a tube sleeve to support the back side of the flare. This style of flare is also common and will get the job done. It really comes down to personal preference and experience. AN fittings are all 37 degrees.
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Frequently asked questions
The most common degree of fuel line flare is 45 degrees.
The SAE standard for fuel line flare is 45 degrees.
AN fittings are all 37 degrees.
The degree of flare for a single flare process is 37 degrees.
The degree of flare for a double flare process is 45 degrees.
