This specification covers dimensional requirements on threads and thread gages and stipulations on gaging practice@ gage specifications and certification as well as the instruments and methods for the inspection of threads for line pipe@ round-thread casing and tubing@ buttress casing and extreme-line casing joints. It is applicable when so stipulated in the API standard governing the product. The inspection procedures for measurements of taper@ lead@ height@ and angle of thread are applicable only to threads having 11? or less turns per inch. All thread dimensions shown without tolerances are related to the basis for joint design and are not subject to measurement to determine acceptance or rejection of product. Thread inspection applies at the point of manufacture prior to shipment@ to inspection at any intermediate point@ to inspection subsequent to delivery at destination@ and to inspection by inspectors representing the purchaser or the manufacturer. The manufacturer may@ at his option@ use other instruments or methods to control manufacturing operations; but acceptance and rejection of the product shall be governed solely by the results of inspection made in accordance with the requirements of this specification. Although this specification contains complete dimensional information for threading and gaging buttress and extreme-line casing joints@ considerable skill and know-how is required for the tooling for@ and machining of@ these joints. Therefore@ any manufacturer who desires to produce these joints is advised to consult with manufacturers who have produced these joints before attempting their manufacture. Policy. American Petroleum Institute (API) specifications are published as an aid to procurement of standardized equipment and materials. These specifications are not intended to inhibit purchasers and producers from purchasing or producing products made to specifications other than API@ and nothing in any API specification is intended to in any way inhibit the purchase of products from companies not authorized to use the API monogram.* Nothing contained in 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. API specifications may be used by anyone desiring to do so@ and every 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. The use of the API monogram is a warranty by the manufacturer to the purchaser that the manufacturer has obtained a license to use the monogram and@ further@ that the product which bears the monogram conforms to the applicable API specification. 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. *The API monogram??AP??is a registered trademark of the American Petroleum Institute.
STD 5B-1979由API - American Petroleum Institute 发布于 1979-03-01，并于 2011-10-21 实施。
* 在 STD 5B-1979 发布之后有更新，请注意新发布标准的变化。
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