This specification covers seamless and welded steel pipe@ seamless and welded open-hearth-iron pipe@ and welded wrought-iron pipe. It includes standard-weight threaded pipe; and standard-weight plain-end@ regular-weight plain-end@ special plain-end@ extra-strong plain-end@ and double-extra-strong plain-end pipe. The sizes and wall thicknesses applicable to the various processes of manufacture under this specification are indicated in the dimensional tables herein. Dimensional requirements on threads and gages@ and stipulations on gaging practice also are covered@ as well as requirements for couplings and thread protectors. Nothing contained in this specification is to be construed as granting any right@ by implication or otherwise@ for manufacture@ sale@ or use in connection with any method@ apparatus@ or product covered by letters patent@ nor as insuring anyone against liability for infringement on letters patent.