This specification covers seamless and welded steel line pipe. It includes standard-weight and extra strong 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 process of manufacture under this specification are indicated in the dimensional tables herein. Dimensional requirements on threads and thread gages@ stipulations of gaging practice@ gage specifications and certification@ as well as instruments and methods for inspection of threads are given in API Std 5B and are applicable to products covered by this specification. 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. This specification is for the convenience of purchasers and manufacturers in ordering and producing pipe and is not intended to inhibit purchasers and producers from purchasing and producing pipe meeting specifications other than those contained herein nor is it intended in any way to inhibit purchasers from purchasing pipe from companies not authorized to use the API monogram.