Truck and trailer OEMs use brass fittings for many applications because of their corrosion resistance, strength, machinability and ability to withstand cold and high temperature variations.  Brass is also light weight and low cost compared to stainless steel or other materials.  These components are commonly used in on heavy trucks that require fittings which meet D.O.T. and SAE specifications in applications such as:

  • Air brake systems
  • Air tanks
  • Cooling systems
  • Cab controls
  • Engine components
  • Fuel lines
  • Transmissions

Tractor-Trailer Air Brake Systems

The following provides detail of applications and specifications of common compression and push-to-connect fittings used in the manufacturing and maintenance of air brake systems for heavy equipment and trucks.

Air Brake Compression Systems

  • Brass body
  • Compatible with copper or SAE J844 Type A & B Nylon air brake tubing
  • Features & Benefits: Electrolysis nickel plated bodies can be used with bio-diesel
  • Male pipe, Female pipe, SAE straight thread
  • Meets D.O.T. FMVSS 571.106 when assembled with applicable tube support and SAE J844 nylon tubing, also approved to SAE J246
  • Specified up to 400 PSI

Air Brake Push-To-Connect Fittings

  • Brass fitting with applicable tube support
  • Compatible with SAE J844 Type A & B nylon tubing
  • Features & Benefits: Quick installation, reduced maintenance and less chance of leakage
  • Male pipe available in both fixed or swivel ends , Female pipe, SAE straight thread
  • Specified up to 250 PSI
  • Meets SAE J2494 and D.O.T. FMVSS 571.106 air brake specifications for available sizes of 1/4” to 1/2”.  Stainless steel tube support for maximum flow for SAE J3494-3 requirements.

Tractor Transmission Fittings

  • Brass body materials
  • Compatible with SAE J844 Type A & B nylon tubing
  • Features & Benefits: A slotted sleeve designed specifically for transmission applications facilitates in eliminating notch stress if over-torqued. These fittings are specifically used in pressure protected air transmission applications.
  • Male pipe thread
  • No specific approvals required by the D.O.T. for vehicle use
  • Specified up to 500 PSI

This blog is an excerpt of our whitepaper, DOT Fittings For Truck & Trailer applications. If you’d like to learn more, click here or below to download the full whitepaper.

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