1、Designation:F436/F436M18aStandard Specification forHardened Steel Washers Inch and Metric Dimensions1This standard is issued under the fixed designation F436/F436M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revi
2、sion.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification covers the chemical,mechan
3、ical,anddimensional requirements for hardened steel washers for usewith fasteners having nominal thread diameters of14through 4in.and M12 through M100.These washers are intended forgeneral-purpose mechanical and structural use with bolts,nuts,studs,and other internally and externally threaded fasten
4、ers.These washers are suitable for use with fasteners covered inSpecifications A354,A449,A563,A563M,F959/F959M,andF3125.1.2 The washers are designated by type denoting thematerial,by style denoting the shape,and by inch or metricdimensions.1.2.1 The types of washers covered are:1.2.1.1 Type 1Carbon
5、steel.1.2.1.2 Type 3Weathering steel.1.2.1.3 This specification provides for furnishing Type 3 tochemical composition or a Corrosion Index(CRI)of 6 orhigher at the suppliers option.1.2.2 The styles of washers covered are:1.2.2.1 CircularCircular washers in nominal sizes14through 4 in.and M12 through
6、 M100 suitable for applicationswhere sufficient space exists and angularity permits.1.2.2.2 BeveledBeveledwashersaresquareorrectangular,in nominal sizes12through 112in.,M12 throughM16,with a beveled 1 to 6 ratio surface for use with Americanstandard beams and channels.1.2.2.3 ClippedClipped washers
7、are circular or beveledfor use where space limitations necessitate that one side beclipped.1.2.2.4 Extra ThickExtra thick washers are circular wash-ers in nominal sizes12through 4 in.,with a nominal thicknessof516in.suitable for structural applications with oversizedholes.1.3 Terms used in this spec
8、ification are defined in Termi-nology F1789 unless otherwise defined herein.1.4 The values stated in either inch-pound units for inchfasteners and SI units for metric fasteners and are to beregarded separately as standard.The values stated in eachsystem may not be exact equivalents;therefore,each sy
9、stemshall be used independently of the other.Combining valuesfrom the two systems may result in non-conformance with thestandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish ap
10、pro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDe
11、velopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A354 Specification for Quenched and Tempered Alloy SteelBolts,Studs,and Other Externally Threaded FastenersA449 S
12、pecification for Hex Cap Screws,Bolts and Studs,Steel,Heat Treated,120/105/90 ksi Minimum TensileStrength,General UseA563 Specification for Carbon and Alloy Steel NutsA563M Specification for Carbon andAlloy Steel Nuts(Met-ric)A588/A588M Specification for High-Strength Low-AlloyStructural Steel,up to
13、 50 ksi 345 MPa Minimum YieldPoint,with Atmospheric Corrosion ResistanceA751 Test Methods,Practices,and Terminology for Chemi-cal Analysis of Steel ProductsA1059 Specification for Zinc Alloy Thermo-Diffusion Coat-ings(TDC)on Steel Fasteners,Hardware,and OtherProducts1This specification is under the
14、jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,Nuts,Rivets and Washers.Current edition approved Sept.1,2018.Published September 2018.Originallyapproved in 1976.Last previous edition approved in 2018 as F436/F436M 18.DOI:10.1520/F
15、0436_F0436M-18A2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of
16、 this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 B695 Specification for Coatings of Zinc Mechanically De-posite
