An Fitting Size Chart Id. Find figure nearest this dimension in column 1 or 2 of chart. We also show the actual unf thread used on these fittings and how this will read in a digital vernier gauge.
Male an/orb adapter identification chart the line drawings below depict the actual sizes of the various common an/orb thread sizes. However, this system does not specify the id (inside diameter) of the tubing because the tube wall can vary in thickness. This will cause leaks and damage to the fittings.
Each an size also uses its own standard thread size.
While an fittings depend on the outside diameter of a tube for sizing, npt fittings depend on the interior diameter (i.d.) of the fitting itself. When to use id vs. While an fittings depend on the outside diameter of a tube for sizing, npt fittings depend on the interior diameter (i.d.) of the fitting itself. Using your automotive hose size, choose from the chart below to find the an equivalent for hose, hose ends and adapter fittings.
