Flared tube nuts are essential components for creating secure and leak-free connections in hydraulic and pneumatic systems. Ensuring you select the correct type and material is crucial for the longevity and safety of your automotive applications. This guide will help you navigate the options to find the most suitable flared tube nuts for your needs.
Looking for the best Flared Tube Nuts?
Discover now our comparison of the best Flared Tube Nuts. It is never easy to choose from the wide range of offers. On the market, you will find an incalculable number of models, all at different prices. And as you will discover, the best Flared Tube Nuts are not always the ones at the highest prices! Many criteria are used, and they make the richness and relevance of this comparison.
To help you make the best choice among the hundreds of products available, we have decided to offer you a comparison of the Flared Tube Nuts in order to find the best quality/price ratio. In this ranking, you will find products listed according to their price, but also their characteristics and the opinions of other customers. Also discover our comparisons by categories. You won’t have to choose your products at random anymore.
No. 1
Premium Brass Flare Nut Set - SAE 45° Flare Tube Fittings for Air Conditioning & Copper Pipe Extension Butt...
- SECURE, LEAK-FREE CONNECTION: Provides reliable sealing for fuel, oil, LP, and natural gas applications, ensuring a stable joint even in high-pressure, vibrating environments. Ideal for SAE flare connections and flare fittings.
- PREMIUM BRASS CONSTRUCTION: Crafted from high-quality brass for superior corrosion resistance, high-temperature ductility, and long-lasting durability. A robust flare nut solution and effective flare tube fitting alternative.
- VERSATILE COMPATIBILITY: Works seamlessly with aluminum, copper, brass, and welded steel tubing, making it perfect for plumbing and HVAC projects. A top choice among hvac flare fittings and copper tube fittings.
- ROBUST PERFORMANCE: Engineered to withstand up to 150 PSI and operate within a temperature range of -65°F to +250°F, ensuring dependable performance under demanding conditions. Excellent for flared tube fittings in critical applications.
- EASY INSTALLATION & REUSABILITY: Features precise thread specifications for a secure fit, enabling quick installation and effortless maintenance for new builds and repairs. An ideal, reusable design that enhances flare fittings efficiency.
No. 2
Premium Brass Flare Nut Set - SAE 45° Flare Tube Fittings for Air Conditioning & Copper Pipe Extension Butt...
- SECURE, LEAK-FREE CONNECTION: Provides reliable sealing for fuel, oil, LP, and natural gas applications, ensuring a stable joint even in high-pressure, vibrating environments. Ideal for SAE flare connections and flare fittings.
- PREMIUM BRASS CONSTRUCTION: Crafted from high-quality brass for superior corrosion resistance, high-temperature ductility, and long-lasting durability. A robust flare nut solution and effective flare tube fitting alternative.
- VERSATILE COMPATIBILITY: Works seamlessly with aluminum, copper, brass, and welded steel tubing, making it perfect for plumbing and HVAC projects. A top choice among hvac flare fittings and copper tube fittings.
- ROBUST PERFORMANCE: Engineered to withstand up to 150 PSI and operate within a temperature range of -65°F to +250°F, ensuring dependable performance under demanding conditions. Excellent for flared tube fittings in critical applications.
- EASY INSTALLATION & REUSABILITY: Features precise thread specifications for a secure fit, enabling quick installation and effortless maintenance for new builds and repairs. An ideal, reusable design that enhances flare fittings efficiency.
No. 3
ChillWaves Brass Flare Tube Fittings, SAE 45 Degree 3/8" Flare Nut Air Conditioning Copper Tube Extension Butt...
- SIZE - 3/8" Flare Nuts. Flare end is SAE 45 degrees, please refer to the dimension drawing for specific diameter, These brass fittings are low in lead but not suitable for drinking water.
- MATERIAL - Made of high-quality brass, with strong wear and corrosion resistance, high compressive strength, durability, low magnetic permeability and high temperature ductility.
- Use - Suitable for liquefied petroleum gas and gases such as natural gas and propane, fuel equipment, flammable liquids, propane, instrumentation, refrigeration, vacuum lines, power steering, hydraulic and pneumatic systems, manufactured for low and...
- WORKING PRESSURE & TEMPERATURE - 1200PSI maximum working pressure, temperature range -65°F to +250°F (-53°C to +121°C)
- WORKING PRINCIPLE - By flaring the end of the pipe to make its diameter larger, fixed to the flare fitting by means of a flare nut, the main function is to increase the flow cross-section of the pipe, reduce the resistance of the fluid, thereby increasing...
No. 4
KAINGA 1/2" Flare Nut, Brass SAE 45° Flare Tube Fitting for Propane, LP, and Natural Gas, Oil, Flared...
- Wide Compatibility: The flare nut provide secure, leak-resistant connections between flared tubing and male flare fittings for easy assembly. Suitable for high-pressure propane, LP gas, natural gas, fuel, refrigeration, plumbing, and vacuum applications
- High-Grade Brass: Made from high-purity brass with low magnetic permeability, excellent corrosion resistance, and thermal ductility. These brass flare fitting are precision-machined under strict quality control to ensure reliable, long-lasting performance
- Leak-Proof Connection: Precision flare nut fitting delivers durable, leak-tight seals for fuel, oil, gas, air, and fluid lines. Compatible with copper, brass, aluminum, and steel tubing, built to withstand high pressure and harsh conditions
- High Durability: Rated for pressures up to 1200 PSI and operating temperatures from -65°F to +250°F, this brass flared tube fitting delivers reliable performance and long service life in tough, high-pressure systems
- Non-Potable Use: Contains low lead and is NOT for use with potable water in the USA, as per federal regulations
No. 5
Podavelle 3AN Hardline Tube Nut and Sleeve Fitting Adapter for 3/16" Hard Line Aluminum Black, 2 sets
- AN3 (3/8x24 UNF) aluminum tube nut and sleeve assembly, suitable for 3/16" outside diameter hardline / tubing
- Package includes two nuts and two sleeves
- Manufactured from lightweight 6061-T6 billet aluminum; Anodized finish for strength, durability and anti-corrosion
- These AN hardline tube nut and sleeve provide a AN / JIC connection to the end of aluminum tubing
- Notice: your hardline tube end will need to be flared at 37 degrees using a flaring tool
No. 6
Premium Brass Flare Nut Set - SAE 45° Flare Tube Fittings for Air Conditioning & Copper Pipe Extension Butt...
- SECURE, LEAK-FREE CONNECTION: Provides reliable sealing for fuel, oil, LP, and natural gas applications, ensuring a stable joint even in high-pressure, vibrating environments. Ideal for SAE flare connections and flare fittings.
- PREMIUM BRASS CONSTRUCTION: Crafted from high-quality brass for superior corrosion resistance, high-temperature ductility, and long-lasting durability. A robust flare nut solution and effective flare tube fitting alternative.
- VERSATILE COMPATIBILITY: Works seamlessly with aluminum, copper, brass, and welded steel tubing, making it perfect for plumbing and HVAC projects. A top choice among hvac flare fittings and copper tube fittings.
- ROBUST PERFORMANCE: Engineered to withstand up to 150 PSI and operate within a temperature range of -65°F to +250°F, ensuring dependable performance under demanding conditions. Excellent for flared tube fittings in critical applications.
- EASY INSTALLATION & REUSABILITY: Features precise thread specifications for a secure fit, enabling quick installation and effortless maintenance for new builds and repairs. An ideal, reusable design that enhances flare fittings efficiency.
No. 7
The Stop Shop Inverted Flare Tube Nut for 3/8" Tube (5/8-18 Threads) (Pack of 12)
- For 3/8" Tube
- 5/8-18 Threads (standard 3/8" tube fitting size)
- Standard Steel
- Most common SAE inverted flare sizes
- Plated for corrosion resistance
SaleNo. 8
EVIL ENERGY 6AN Female Hardline Tube Nut & Sleeve Aluminum Fitting for 3/8" OD Alloy Tubing 2PCS
- Thread Size: The thread size of 6an is 9/16-18 UNF,tube sleeve used to 3/8'' OD stainless steel tube.
- Material: Made of aluminum alloy 6061-T6, the working temperature range is from -65℉ to 252℉.
- Function: The nut is used for the conversion of the alloy pipe and the fitting,the sleeve is used to fix the pipe and prevent it from moving, and the sleeve is sealed with a 37 degree and an outer flaring of the pipe.
- Installation：Need to install the tube nut and sleeve on the tubing first.Then use a 37° flaring tool to flare the end of the coiled aluminum / stainless steel tube.Professional installation recommended.
- Application: Widely used in engine modification, refueling system, fuel system, brake system, cooling system.
No. 9
KAINGA 3/8" Flare Nut, Brass SAE 45° Flare Tube Fitting for Propane, LP, and Natural Gas, Oil, Flared...
- Wide Compatibility: The flare nut provide secure, leak-resistant connections between flared tubing and male flare fittings for easy assembly. Suitable for high-pressure propane, LP gas, natural gas, fuel, refrigeration, plumbing, and vacuum applications
- High-Grade Brass: Made from high-purity brass with low magnetic permeability, excellent corrosion resistance, and thermal ductility. These brass flare fitting are precision-machined under strict quality control to ensure reliable, long-lasting performance
- Leak-Proof Connection: Precision flare nut fitting delivers durable, leak-tight seals for fuel, oil, gas, air, and fluid lines. Compatible with copper, brass, aluminum, and steel tubing, built to withstand high pressure and harsh conditions
- High Durability: Rated for pressures up to 1200 PSI and operating temperatures from -65°F to +250°F, this brass flared tube fitting delivers reliable performance and long service life in tough, high-pressure systems
- Non-Potable Use: Contains low lead and is NOT for use with potable water in the USA, as per federal regulations
No. 10
Anderson Metals 54014-06 Brass Tube Fitting, Short Flare Nut, 3/8" Tube OD
- Short flare nut for connecting to a tube or fitting
- Connects to copper, brass, aluminum, or steel tubing
- Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability
- Operating temperature range of -65 to +250 degrees F
- Resists mechanical pullout for a more secure connection
- These fittings contain lead and are not allowed by federal law to be installed for potable water use in the U.S.A. and its territories.
$4.12
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Last update on 2026-03-31 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Flared Tube Nuts
Comparison Tips
When comparing options, focus on the material's suitability for your fluid type and operating environment. Check the specified flare angle (37° or 45°) to match your existing tubing. Verify the tubing outside diameter and thread size are exact matches for your application. Read reviews to gauge user experiences regarding ease of installation and long-term performance.Frequently Asked Questions
What is the difference between 37-degree and 45-degree flares?
The degree refers to the angle of the flare on the tubing. 37-degree flares are common in high-pressure hydraulic systems and aerospace, while 45-degree flares are typically found in automotive brake and fuel lines.
Can I use a brass nut on a steel fitting?
Generally, yes, but it's best to match materials for optimal performance and to prevent galvanic corrosion, especially in harsh environments. Check compatibility with the fluid being used.
How do I determine the correct size flared tube nut?
You need to know the outside diameter of the tubing and the thread size of the fitting it will connect to. The thread size is often denoted by a dash number (e.g., -4, -6).
What happens if I over-tighten a flared tube nut?
Over-tightening can deform or crack the flare on the tubing, or damage the sealing surface of the fitting. This can lead to leaks and require replacement of components.
Are flared fittings self-sealing?
Yes, flared fittings create a seal through the metal-to-metal contact between the flared end of the tubing and the fitting body. Sealants are typically not required for the flare itself.
What is the function of a flared tube nut?
The primary function of a flared tube nut is to secure the flared end of a tube to a fitting body, creating a strong and leak-resistant mechanical seal for fluid or gas lines.
