An hose sizes were designed to match the id sizes of these rigid tubes. Can you see the confusion starting.

Pulsar Hydraulics Hydraulic Hose Fittings And Adapters
An hose fittings size chart. Fitting thread size chart the following chart is intended as a quick reference guide for thread size by dash size. 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. 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.
A 38 standard hose equals 6 an. Click above to shop all fittings or try our search function in the top right corner. 1 18 1 716 24. 1 34 2 332. All an fittings have a mating flare seat at 37 degrees this guide will use the an name to refer to these fittings. 1 12 1 1316 32.
An fittings come in a range of sizes they are called the dash size because it has a dash followed by two digits. Hose size chart fractional equivalent all dimensions are in inches unless otherwise noted. 1 38 1 4564 28. Sizes for rigid tubes were already standardized with sizes called out by tubing od 316 12 etc.