What size is an air chuck?
The Campbell Hausfeld ball tire chuck (MP323300AV) is designed to inflate car and bike tires. The built-in shut-off valve seals air when not in use. This ball foot chuck has a thread size of 1/4 inch NPT (F).
Are all air chucks the same size?
First off, there are different basic flow sizes, such as 1/4″, 3/8″ and 1/2″. This doesn’t refer to the size of fitting on the end of the plug, but rather the volume of air the plug can handle.
What is an air chuck?

Simply put – air chucks are valve fittings that secure to your tire valve stem for tire pressure inflation & maintenance. They allow air to flow to and from the tire to help monitor and maintain correct inflation. Air chucks are typically sold as attachments for tire pressure gauges, inflators, or air compressor hoses.
What is a lock on air chuck?
Chuck locks on valve when cocked on threads.
What are air chucks made of?
The brass chuck design inflates tires easily, even on heavy-duty work vehicles thanks to a 250 PSI maximum pressure rating. There’s no need to thread the chuck to valve stems, because a locking clip securely seals the air chuck into place on a valve stem. A straight tip makes inflation hassle free.
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.
What PSI should I set my air compressor to fill tires?
As a general rule, it’s best to use a compressor with a maximum operating pressure of at least 10 PSI higher than the recommended tire pressure. So if your tire needs 100 PSI, you’ll want a compressor capable of generating 110 PSI or higher.