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How to choose air brake tube and fittings for trucks and trailer?

Views: 129     Author: Site Editor     Publish Time: 2021-12-13      Origin: Site


Air brake systems are used in heavy-duty vehicles like trucks and trailers to ensure secure and efficient stopping. Air brake tubes and fittings on these vehicles are mainly undetectable, yet they are essential to the air brake system's dependable functioning. Between 60 and 100 air brake tube fittings are needed for a standard truck, and the efficiency of the assembly line, cost, and performance of the brake system can all be significantly impacted by these parts.

The following code criteria must be able to be met by air brake tubing, tube fittings, and assemblies:

Tensile strength
Conditioning in boiling water and tensile strength
Tensile strength and thermal conditioning
resistance to vibration
Retention for end fittings
Thermal acclimatization and end-fitting maintenance
Serviceability of end fittings
resistance to corrosion in end fittings

Following essential factors when selecting DOT-compliant air brake fittings:

Cost-effective performance
Assembly time

See the the complete series of American brass fittings


Three primary DOT air brake fitting types.

Brass compression fittings

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air brake hose1

DOT compression fitting1

brass compression fitting

Brass compression fittings have been a standard in the industry for many years because of their dependability, adaptability, and comparably low cost. Although reasonably priced, installation is typically more labor-intensive with these fittings than others. However, once installed, they are considered exceptional at creating mutual connections and providing improved sealing performance.

Compression fittings made of brass are heat-resistant. They are frequently chosen for settings in engine compartments and next to air compressors as a result.

Brass compression fittings are well-suited to customization. Brass can be quickly formed into a variety of shapes.

Brass push connect fittings

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brass push in fittings (1)brass push in fittings (2)


Brass push-to-connect fittings reduce complexity and fitting assembly time. They maintain the performance profile of brass compression fittings while enabling reasonably straightforward assembly with only a tool cutter as the only required instrument.

Reducing assembly time is the main advantage of using brass push-to-connect fittings. It is possible to save the installation time by up to 90%. When these savings are added together over time and through installation, the user can experience a significant cost benefit. The color-coding of the brass push-to-connect fittings is another option. This assists in locating the fittings' installation location, saving time and minimizing installation mistakes.

Composite push connect fittings

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Composite push-to-connect fittings offer all the labor-saving benefits of brass push-to-connect fittings but are made with a polymer body and brass screw threads. The polymer, however, makes the material lighter and less expensive than metal. When collectively considered on board a truck with 100 or more DOT fittings, the 40% weight reduction can be a significantly advantageous design element. Customization is also improved as the polymer is manufactured utilizing various injection molding techniques.

Why is nylon hose used in brake tubing?

Nylon tubing is made of Polymide. which has a strong resistance to abrasion. It is used in high-pressure and high-temperature applications.

UV stabilization is a feature of nylon tubing that might be useful when used in hotter climates or locations with direct sunshine exposure. Thanks to its internal elastic memory, it can be flexed repeatedly over an extended time without growing weary or cracking. Because of its flexibility, nylon tubing may be incorporated into various intricate patterns.

Nylon tubing is ideally suited for resisting a wide range of fungi and mold, as well as solvents, alkalis, grease, oils, and petroleum. Nylon tubing has a shallow moisture absorption rate and is impact-resistant even at below-freezing temperatures. The frequent result of external temperatures is a reduction in size or dimensional stability.

Single-Layer Nylon Tubing - Single-wall extruded Nylon (polyamide) for all size

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The most popular kind is known as nylon 6. The name "nylon 6" refers to typical nylon containing six carbon atoms. Due to its moisture resistance, nylon 6 is more corrosion-resistant than other varieties of nylon tubing. A single monomer, which is by definition a simple molecule with two or more places where other monomers can bind, is used to make nylon 6.

Flexible nylon tubing is made from nylon 11 resin, which includes a profound compound that significantly increases flexibility. Flexible nylon tubing is also called super soft nylon tubing. Super soft nylon tubing contains numerous properties that help keep it dimensionally stable and allow it to resist chemicals, abrasions, impact, heat, and moisture.
Nylon 11 is produced using castor beans, so this type of nylon tubing fits environments where polyurethane is impractical. These environments include fuel, gas detection, lubrication, coolant and refrigeration, pneumatic equipment, robotics, and suspension lines.

Polyamide 12 is a polymer with a very varied petrochemical origin. Its properties range from being hard with an elastic modulus of roughly 1400 MPa to being exceedingly flexible with an elastic modulus of approximately 250 MPa. In addition, it has the best resilience to cold temperatures thanks to its affinity with olefinic rubbers. This polyamide has low water absorption due to the high ratio of -CH2- to -CONH- groups, which contributes to its dimensional stability. Since Polyamide 12 is the lightest polyamide, it encourages low-cost solutions and its application in the transportation industry. It is a good candidate for the majority of applications due to its superior chemical resistance and resistance to air conditions. The several varieties of polyamide 12 available in commerce offer a wide range of industrial applications.

Double-Layer Nylon tubing - DOT Nylon Tubing  Nylon (polyamide) core, fiber reinforcement, Nylon (polyamide) cover/sheath

DOT nylon tubing is a type of nylon tubing that requires compliance with the Department of Transportation, and this is why it is given such a name. It is an engineered polyester blend, and the DOT nylon tubing remains more flexible for extended periods than standard nylon tubing. Due to this factor, DOT nylon tubing is then found for use in vehicle brake lines.

DOT nylon tubing can withstand hot, oily, and cold conditions, having a temperature range that caters from -85 °F (-65 °C) to more than 200 °F (93 °C). This type of nylon tubing is flexible, lightweight, and resistant to fatigue. DOT nylon tubing is also dimensionally stable. In addition to this, it offers resistance to abrasion and vibration.

Air braking tubine conforms to SAE J844 Standard, widely used for air trailer, >See the selection



See the SAE J844 tube details

SAE J844 TUBE.pdf


•100% Pressure Tested                    

•Excellent UV Stability

•Abrasion Resistant

•Kink Resistant


•Meets SAE Specification J844



Type A - Single-wall extruded Nylon (polyamide) for all size

Type B - Nylon (polyamide) core, fiber reinforcement, Nylon (polyamide) cover/sheath

From 1/4 O.D. to 3/4 O.D.


Temperature Range: -40℉(-40℃)to + 200℉ (93℃)

Working Pressure: 150 psi (10.3 bar)

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