What size are Air Lines on semi?
Lead length is usually 12, 40, 48 or 72 in.; the most common is 48 in. Lead length on the trailer side of the assembly should generally be between 6 and 12 in. Since the installation locations on trailers are usually very low, the use of leads that are longer than this will likely cause sagging of the lines.
What is a dot air fitting?
D.O.T. Air Brake Fittings. Another extremely important set of components to an air brake system are the fittings that connect the air lines. These fittings must be Department of Transportation compliant and are referred to as D.O.T. fittings.
What is the blue air line on a tractor trailer?
The blue line is the air line for the trailer’s service brake. Connect these lines to the corresponding couplers and socket on the trailer before moving the trailer. We recommend starting with the blue line since it is the farthest away.
Are all air hose fittings the same?
There are many different types of air fittings but most air tools use one of just a few types of connector. The main things to consider are the fitting type and the thread size. Common fixing types include ¼” BSP, ¼” PCL and 3/8” NPT.
What is the blue glad hand for?
A tractor / trailer typically has two gladhands – one for service brakes and another for emergency brakes. Gladhands are color coded. In North America, service lines are blue and emergency brake lines are red and are standardized by SAE International’s standard SAE J318.
What does a Gladhand do?
A glad hand is a device found at the end of an air line that connects to another air line. It is found on railroad cars and slightly resembles a pair of hands involved in a hand shake. The two hands are connected by placing them together at right angles and then twisting them to form a straight line.
Are brass fittings DOT approved?
D.O.T.-approved push-in brass fittings from Polyconn are for use in many air-operated operations in vehicles, from air brake connections to gearshifts and windows and door locks to air operated seats and air horns. Samples of Polyconn’s D.O.T. approved push-in brass fittings include tee branch and elbow designs.
Are Compression Fittings DOT approved?
Properly designed compression and push-to-connect fittings both meet or exceed D.O.T requirements. In order to ensure the proper fitting selection for a specific application it is important to confirm: Required PSI (pounds per square inch) pressure rating.
What color is the service line on a semi trailer?
What size air fittings do I need?
If the size of thread in your air tool is ¼ inch then you will want a ¼” air fitting. The same is true for your air compressor. If the thread size is 3/8” on your air tool then a 3/8” body fitting is what you need. If you are operating a large air tool it may have ¼ or 3/8 inch thread to screw your male plug into.