This document establishes the requirements for Aeronautical National Form (ANPT) pipe threads@ gages@ and gaging methods for determining conformity of aeronautical taper pipe threads to this standard. Purpose Threads and gages covered by this standard are intended for use on pipe@ plugs@ fittings@ and similar devices in aeronautical components and equipment requiring a sealed thread joint@ and where straight threads and gaskets or O-rings are inadequate.