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Another question that is often asked is what size of Air Quick Coupler does a person need? The most common size fitting is ¼ inch. This is true for both ¼ and 3/8 inch air hose. Most 3/8 air hose comes with ¼ inch ends on it, thus most use a ¼ inch air fitting. Another important thing to consider when choosing the right size fitting is what size of thread is your air tool or air compressor. 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. That is why it is important to check. There are air fittings that have a different size body then the thread. For example you could get a 3/8 inch body air coupler with ¼ female or male pipe thread. These are an options but by far the most common is to get the same size body as the thread. If you are running ½ inch hose you will most likely use a ½ inch body fitting with ½ inch male or female pipe thread. If a product number is stamped on an air coupler or fitting usually the first number is the body size and if there is a second number it will be the thread size. If there is only one number that will often indicate that the body and the thread are the same size. For example our product number AC4F tells you that this is an Automotive coupler (AC) that is ¼ inch body (4) and since there is not a second number we know that it has ¼ female pipe thread(F). Here is another product number example – IP6M4. From this product number we know that this is a male body air fitting with male pipe thread, but the thread is a different size than the fitting. From the product number we know that it is an Industrial Plug (IP) that has a 3/8” body (6) with ¼” male pipe thread (4M). If your fittings have product numbers stamped on them you can quickly figure out what size and style you have. You can also Google the product number and that will usually get you the info you need.
