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How to buy air fittings.                             We receive an average of 3 questions a day asking us if we can  help with an airline fitting problem. Most revolve around the question  of compatibility with existing fittings or connectors on air tools,  compressors etc.  This short guide has been put together to try and give quick online help to these common questions.      Basic Information:    The NPT Fitting Standard A thread boss is the hole in the device or air tool into which you  insert or thread a fitting. The boss could be an air tool, an air valve  port, an air cylinder port, an air manifold, or any number of other  compressed air components.  NPT stands for National Pipe Taper.  If a specific air fitting is manufactured to the NPT standard, it  will have dimensional compatibility with other NPT threaded fittings of  all other manufacturers. Which is another way to say that all NPT  fittings are interconnectible. One manufacturers fitting can be replaced with the same NPT size  fitting of another manufacturer, and both – assuming they are the same  size –  will fit the same threaded hole in your air cylinder, actuator,  air tool handle, valve…or whatever the application is.Different NPT Fitting Sizes Fitting sizes can be a bit confusing! Do not make the assumption –  as I  used to –  that a 1/4″ NPT fitting thread is anywhere near 1/4 inch in  diameter!  Not even close. Visit your favorite hardware or plumbing store and ask for a 1/4″  fitting. The fitting they will show you will likely be a 1/4″ NPT. You  will look at the diameter of the thread and say to yourself, this ain’t  no 1/4″ fitting. It will be. The actual diameter of the 1/4″ NPT thread  will be just over 1/2″. The size of an NPT fitting, teh 1/4″, the 3/8″, 1/2″ and so on are  reference sizes. The actual size of each is much larger than the  fraction size they are supposed to be. NPT Fitting Size Chart To help you get a grip on the actual sizes of NPT fittings, see the  chart below. It shows the comparison between NPT fitting sizes and their  actual inch equivalents. On this chart I have listed the NPT thread size first, and then what  that thread size is in actual (decimal) inches, and then the closest  common size fraction to that NPT size.Sizing The Hole or Fitting Port To determine the size of a threaded air port in an air tool handle, air   cylinder, an valve, or the female thread in any compressed air  component, you will want to measure the width of the hole in inches.  That’s the distance across the middle of the opening.    Compare that result  to the fractional sizes on the chart to help guide you to the right male-threaded NPT fitting size to use. NPT, as an acronym for National Pipe Taper, and is an industry  dimensional standard. The threads of different fittings with the same  NPT size will connect, but that does not mean that all of the fittings  will necessarily look the same. Fittings And What You Need To Know What do you need to know when you are trying to determine what fitting to use and where to use it? You need to identify the…Port size / fitting thread size into which the male thread is screwedSize of tube or hose that you want to attach to the fitting; and note, tube and hose do NOT connect the same wayStyle of fitting; whether it is a straight, elbow, Tee , run Tee etc.) The way the hose or tube is to be connected to the fitting  Fitting NPT Port Sizes You will commonly see the following in NPT thread sizes;10-321/8 NPT1/4 NPT3/8 NPT1/2 NPT There are certainly much larger NPT sizes. The sizes listed above are  the commonest fittings in industrial compressed air applications. How Fittings Seal When you thread the fitting into the hole in the valve, or cylinder, or  air tool,  the NPT type thread seals by threading into – penetrating the  thread boss (the threaded hole) until it is tight. That typically means  that sufficient threads on the fitting are interlaced with sufficient   threads in the boss to generate a seal.