"Definition ""One-piece"" sucker rod is understood to mean a rod whose body and pin or box ends are an integral unit. The ends may be formed by forging the ends of a one-piece body stock or by welding or fusing end pieces on the body ""Three-piece"" sucker rod is understood to mean a rod whose body and pm or box ends are joined by threaded connections Except where specified ""one-piece"" or ""three-piece"" this specification shall apply to both types of sucker rods Coverage This specification covers (1) three grades of sucker rods; (2) dimensional requirements for sucker rods@ couplings@ subcouplings and polished rod connections@ (3) stipulations on thread gages@ gaging practice and gage certification. (4) polished rods and polished rod liners@ (5) stuffing boxes and pumping tees (6) requirements on packaging@ and (7) conditions under which the API monogram may be used Policy. (1) American Petroleum Institute (API) Specifications are published as aids to the procurement of standardized equipment and materials as well as@ instructions to API Licensees These Specifications are not intended to obviate the need for sound engineering@ nor to inhibit in any way anyone from purchasing or producing products to other specifications (2) The formulation and publication of API Specifications and the associated license program is not intended in any way to inhibit the purchase of products from companies not licensed to use the API monogram (3) Nothing contained m any API Specification is to be construed as granting any right by implication or otherwise for the manufacture@ sale@ or use in connection with any method@ apparatus@ or product covered by letters patent@ nor as insuring anyone against liability for infringement of letters patent (4) API Specifications may be used by anyone desiring to do so@ and diligent effort has been made by the Institute to assure the accuracy and reliability of the data contained in them However the Institute makes no representation@ warranty or guarantee in connection with the publication of any API Specification and hereby expressly disclaims any liability or responsibility for loss or damage resulting from their use@ for any violation of any federal@ state or municipal regulation with which an API Specification may conflict or for the infringement of any patent resulting from the use of an API Specification (5) The application of the API monogram is a warranty that the licensee has obtained a valid license to use the monogram and that each individual item which bears the monogram conformed@ m every detail@ with the applicable API Specification at the time of manufacture However@ the American Petroleum Institute does not represent warrant or guarantee that products bearing the API monogram do in fact conform to the applicable API standard or specification"