An fittings come in a range of sizes they are called the dash size because it has a dash followed by two digits. 1 38 1 4564 28.

How To Install Push On Hose Fittings An Hose Fitting Guide
An hose fittings size chart. Click above to shop all fittings or try our search function in the top right corner. A 38 standard hose equals 6 an. An hose sizes were designed to match the id sizes of these rigid tubes. 1 18 1 716 24. Hose size chart fractional equivalent all dimensions are in inches unless otherwise noted. Male an adapter identification chart the line drawings below depict actual sizes of the various common an thread sizes by dash number.
Using your automotive hose size choose from the chart below to find the an equivalent for hose hose ends and adapter fittings. Fitting thread size chart the following chart is intended as a quick reference guide for thread size by dash size. 1 12 1 1316 32. All an fittings have a mating flare seat at 37 degrees this guide will use the an name to refer to these fittings. Sizes for rigid tubes were already standardized with sizes called out by tubing od 316 12 etc. The idea behind an hoses and an fittings was to provide a flexible alternative to rigid tubing in plumbing systems on aircraft and military vehicles.
Here is an an size chart. An size hose size thread size 3. Can you see the confusion starting. 1 34 2 332.