ASTM_F_812_-_12_2017.pdf

Designation:F81212(Reapproved 2017)Standard Specification forSurface Discontinuities of Nuts,Inch and Metric Series1This standard is issued under the fixed designation F812;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()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 establishes allowable limits for thevarious types of surface discontinuities that may occur duringthe manufacture and processing of metric-series nuts withnominal diameters 5 mm and larger and inch-series nuts withnominal diameters14in.and larger.1.2 The values stated in either SI(metric)or inch-poundunits are to be regarded separately as standard.The valuesstated in each system are not exact equivalents;therefore,eachsystem must be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith the specification.1.3 When the engineering requirements of the applicationnecessitate control of surface discontinuities on nuts,thepurchaser shall specify conformance to this ASTM specifica-tion in the original inquiry and purchase order.1.3.1 When the engineering requirements of the applicationnecessitate that surface discontinuities on nuts be controlledwithin limits closer than those specified in this specification,the purchaser shall specify the applicable limits in the originalinquiry and purchase order.1.4 The allowable limits established in this specification formetric nuts,with nominal diameters 5 to 24 mm inclusive,areessentially identical with requirements given in ISO/DIS 6157II.There are no ISO standards for surface disconti-nuities on metric-series nuts with nominal diameters largerthan 24 mm or on any inch-series nuts.1.5 The following precautionary caveat pertains only to thetest method portion,Section 7,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety,health,andenvironmental practices and determine the applicability ofregulatory 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 theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2F606/F606M Test Methods for Determining the MechanicalPropertiesofExternallyandInternally ThreadedFasteners,Washers,Direct Tension Indicators,and RivetsF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1789 Terminology for F16 Mechanical Fasteners2.2 ISO Standard:ISO/DIS 6157 IIFasteners,Surface Discontinuities onNuts33.Ordering Information3.1 Orders for nuts requiring surface discontinuity controlshall include:3.1.1 ASTM designation and date of issue of this specifica-tion.3.1.2 Special requirements,for example,closer discontinu-ity limits(1.3.1)and inspection sampling plan(6.2).4.Types of Surface Discontinuities(See Standard F1789for definitions not provided)4.1 Crack:4.1.1 Quench CracksTypical quench cracks are shown inFig.1;limits are specified in 5.2.4.1.2 Forging CracksTypical forging cracks are shown inFig.2;limits are specified in 5.3.4.1.3 Inclusion CracksNormally caused by nonmetallicinclusions or stringers inherent in the raw material.Typicalinclusion cracks are shown in Fig.2;limits are specified in 5.3.1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.93 on QualityAssurance Provisions for Fasteners.Current edition approved Sept.1,2017.Published September 2017.Originallyapproved in 1983.Last previous edition approved in 2012 as F812 12.DOI:10.1520/F0812-12R17.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of 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 4.1.4