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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.
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.
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.
FOR AC AND REFRIGERATION COPPER LINES: These brass flare nuts connect properly flared 3/8-inch OD copper tubing to compatible air-conditioning service or shutoff valves. Suitable for HVAC repairs and matching refrigeration copper-line connections.
VERIFY THE 5/8-18 UNF CONNECTION: The 3/8-inch variation identifies the outside diameter of the copper tube rather than the internal thread size. Each female nut has a 5/8-18 UNF thread and a 9.8 mm tube opening, allowing the tube and valve dimensions to...
45-DEGREE FLARE STRUCTURE IN HPb59-1 BRASS: The shaped internal seat holds the prepared copper-tube flare against the corresponding valve cone. A 22 mm hex width provides a defined wrench surface, while the overall nut length is approximately 17 mm.
ASSEMBLES WITH A PROPERLY FLARED TUBE: Place the nut over the copper tubing before using the flaring tool, form the correct 45-degree flare, align the tube end with the service-valve seat, and tighten with an appropriate wrench. Tubing, valve, and tools...
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.
SIZE - 1/2" Flare Nuts. Flare end is SAE 45 degrees, please refer to the dimension drawing for specific diameter.
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 gas, instrumentation, refrigeration, vacuum lines, power steering, hydraulic and pneumatic systems, manufactured for low and medium pressure piping connection engineering.
WORKING PRESSURE & TEMPERATURE - 1200PSI maximum working pressure, temperature range -65°F to +250°F (-53°C to +121°C)
Set Includes: Each set contains 10 metric brake line fittings, a sufficient quantity to meet daily replacement and maintenance needs, helping to maintain smooth braking system operation.
Quality Materials: These brake line fittings are made of brass, possessing high hardness, good toughness, and fracture resistance. The surface prevents rust and maintains reliable performance over long-term use.
Precise Dimensions: This M10 fitting has an M10×1.0 thread, approximately 0.67 inches/17 mm in length and 0.43 inches/10 mm in diameter. Its compact design saves space, making it easy to store and carry. Please confirm size compatibility before use.
Leak-Proof Sealing: This car brake line fitting features a flared interlocking design, ensuring a secure hose connection under high pressure, forming an effective seal to prevent oil leaks and detachment, providing stable protection for the braking...
FOR HVAC SERVICE VALVE CONNECTIONS: Designed for air-conditioning and refrigeration copper-line work, these brass flare nuts connect properly flared 1/4-inch OD copper tubing to compatible HVAC service or shutoff valves. Suitable for matching AC and...
CHECK THE TUBE OD AND VALVE THREAD: The 1/4-inch size refers to the outside diameter of the copper tube, not the nut thread diameter. Each female flare nut has a 7/16-20 UNF thread and a 6.6 mm tube opening; compare both measurements with the existing...
HPb59-1 BRASS WITH A 45-DEGREE FLARE SEAT: The brass body presses the prepared copper-tube flare against the matching valve cone to complete the connection. Each nut measures approximately 17 mm across the hex and 15 mm in overall length.
INSTALL BEFORE FLARING THE COPPER TUBE: Slide the nut onto the copper tubing before forming the flare, prepare a clean 45-degree tube end, align it with the compatible valve seat, and tighten with a suitable wrench. Copper tubing, service valve, flaring...
Superior Sealing: 1/4 flare nut designed for fuel oil, LPG, and natural gas systems, this fitting provides a reliable seal, maintaining stability even under high-pressure shocks and continuous vibration
Reliable Construction: Brass flare nut constructed from corrosion-resistant brass, this component maintains excellent ductility even at high temperatures and can withstand repeated thermal cycling. It can be used as a reliable replacement for flared nuts...
Wide Compatibility: Flare nut compatible with aluminum, copper, brass, and welded steel pipes, this fitting is suitable for a wide range of piping, refrigeration, and HVAC installations
High Operating Capacity: Brass flare nut rated to pressures up to 150 PSI and operating in temperatures from -65°F to +250°F, this fitting operates reliably even in extremely cold, hot, and fluctuating environments
CONNECTS HVAC COPPER TUBING TO SERVICE VALVES: Made for air-conditioning and refrigeration maintenance, these brass flare nuts secure properly flared 1/2-inch OD copper tubing to compatible HVAC service or shutoff valves, helping complete a correctly...
1/2-INCH TUBE OD WITH 3/4-16 UNF THREAD: The variation size refers to the copper tube outside diameter and should not be confused with the nut thread. Each female flare nut has a 3/4-16 UNF thread and a 12.9 mm tube opening; verify both specifications...
HPb59-1 BRASS FLARE NUT WITH DEFINED DIMENSIONS: The 45-degree flare seat holds the prepared tube end against the matching valve cone. The 24 mm hex width provides a wrench surface, while the 20 mm overall length helps compare the replacement nut with the...
USE WITH A CORRECTLY PREPARED TUBE END: Slide the nut onto the copper tubing first, form a clean 45-degree flare, position the flare against the compatible service-valve seat, and tighten using the correct wrench. The copper line, valve, flaring tool, and...
Advantages : a series of different specification, covered various needs. Solid Brass Construction:crafted from high-quality solid brass for exceptional durability and corrosion resistance. Well machined, good threads with no rough edges. The threaded...
Please note - Designed For Tubing That Can Be Flared . The Size is mean the Tube OD, Not the thread size .
Last update on 2026-10-15 / 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.
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