1、Alloy and Carbon Steel Bolting for Use in the Petroleum and Natural Gas IndustriesAPI SPECIFICATION 20ESECOND EDITION,FEBRUARY 2017EFFECTIVE DATE:AUGUST 2017ADDENDUM 1,SEPTEMBER 2018 ADDENDUM 2,MARCH 2019ERRATA 1,NOVEMBER 2021Special NotesAPI publications necessarily address problems of a general na
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6、ailability of proven,sound engineering and operatingpractices.These publications are not intended to obviate the need for applying sound engineering judgmentregarding when and where these publications should be utilized.The formulation and publication of API publicationsis not intended in any way to
7、 inhibit anyone from using any other practices.Users of this specification should not rely exclusively on the information contained in this document.Sound business,scientific,engineering,and safety judgment should be used in employing the information contained herein.Any manufacturer marking equipme
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12、d,“should”denotes a recommendation or that which is advised but not required in orderto conform to the standard.May:As used in a standard,“may”denotes a course of action permissible within the limits of a standard.Can:As used in a standard,“can”denotes a statement of possibility or capability.This d
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15、director.For API Monogram Program licensees and APIQR Program registrants,this standard shall become effective onthe program date printed on the cover but may be used voluntarily from the date of publication.Generally,API standards are reviewed and revised,reaffirmed,or withdrawn at least every five
16、 years.A one-timeextension of up to two years may be added to this review cycle.Status of the publication can be ascertained from theAPI Standards Department,telephone(202)682-8000.A catalog of API publications and materials is publishedannually by API,1220 L Street,NW,Washington,DC 20005.Suggested revisions are invited and should be submitted to the Standards Department,API,1220 L Street,NW,Washington,DC 20005,standardsapi.org.iiiContentsPage1Scope.11.2Purpose .11.3Applicability.11.4Bolting Spe
