Each an size refers to the outer diameter od of the tube or inner diameter id of the hose that its used with. Using your automotive hose size choose from the chart below to find the an equivalent for hose hose ends and adapter fittings.
Stamped Hose And Fittings Source
An fitting hose size. The numbers assigned equal the size in 116 inch increments. For example a 3 an hose has an external diameter of 316th of an inch. Similarly 8 an hoses are 816 12 inch in outer diameter. 1 12 1 1316 32. Even manufacturers specializing in an style fittings strictly for motorsports tend to skip over the 5an size for the most part. We are a leading supplier and manufacturer of performance automotive plumbing parts and accessories.
Since tubing and hoses have assorted wall thicknesses depending on manufacturers the designated size number does not necessarily tell us anything about the inside diameter id of the plumbing component. The an size reference the outer diameter of hose in 116th of an inch increments. An fittings use a 37 degree flare as the sealing surface. An sizes range from 2 to 32 in irregular steps with each step equating to the od outside diameter of the tubing in 116 increments. In this case 6 hose would indicate a hose with an inside diameter of 616 or 38. 1 is 116 2 is 216 and so on.
While a specification exists for 5an hose and fittings it is exceedingly rare in the aircraft industry. 1 34 2 332. One glaring mismatch is the popularity of 516 8mm fuel hose on automobiles. 1 38 1 4564 28. A 38 standard hose equals 6 an. In another example a 10 tube would indicate a tube with an outside diameter of 1016 or 58.
Do not use an fittings with different flare type fittings. Hose size chart fractional equivalent all dimensions are in inches unless otherwise noted. This will cause leaks and damage to the fittings. Each dash size corresponds to a progressively larger diameter measured in sixteenths of an inch. We have a reputation for being helpful knowledgeable and consistently delivering high levels of customer service coupled with a product range that has a technically superior hose end design and manufacturing process. 4 an 416 or 14.
An or armynavy was never intended to characterize an entire fluid system and is mostly designed as a thread specification. Hose diameters are assigned an numbers. The an sizing can be confusing at first but once you get used to it you can tell the size just by looking at the fitting. 1 18 1 716 24. The line drawings below depict actual sizes of the various common an thread sizes by dash number. You can convert any an fitting to its nominal inch size by dividing the an number by 16 as follows.
Gallery of An Fitting Hose Size
