1、Designation:F959M13Standard Specification forCompressible-Washer-Type Direct Tension Indicators forUse With Structural Fasteners(Metric)1This standard is issued under the fixed designation F959M;the number immediately following the designation indicates the year oforiginal adoption or,in the case of
2、 revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript 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 Thisspecificati
3、oncoverstherequirementsforcompressible-washer-type direct tension indicators capable ofindicating the achievement of a specified minimum bolt tensionin a structural bolt.1.2 Two types of direct tension indicators in nominaldiameter sizes M16 through M36 are covered:1.2.1 Type 8.8direct tension indic
4、ators for use with Speci-fication A325M bolts,and1.2.2 Type 10.9direct tension indicators for use withSpecification A490M bolts.1.3 Direct tension indicators are intended for installationunder either a bolt head or a hardened washer.(See ResearchCouncil on Structural Connections:Specification for St
5、ructuralJoints Using ASTM A325 or A490 Bolts.)1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 The following precautionary statement pertains only tothe test methods portions,Section 12,and Appendix X1 of thisspecification
6、:This standard does not purport to address all ofthe safety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Document
7、s2.1 ASTM Standards:2A325M Specification for Structural Bolts,Steel,HeatTreated 830 MPa Minimum Tensile Strength(Metric)F436M Specification for Hardened Steel Washers(Metric)A490M Specification for High-Strength Steel Bolts,Classes10.9 and 10.9.3,for Structural Steel Joints(Metric)B695 Specification
8、 for Coatings of Zinc Mechanically De-posited on Iron and SteelD3951 Practice for Commercial PackagingF606M Test Methods for Determining the Mechanical Prop-erties of Externally and Internally Threaded Fasteners,Washers,and Rivets(Metric)F1470 Practice for Fastener Sampling for Specified Me-chanical
9、 Properties and Performance Inspection2.2 Research Council on Structural Connections Standard:Specification for Structural Joints Using ASTM A 325 orA490 Bolts33.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 compressible-washer-type direct tension indicator,na washer-type eleme
10、nt inserted under the bolt head orhardened washer,having the capability of indicating theachievement of a required minimum bolt tension by the degreeof direct tension indicator plastic deformation.Hereafter re-ferred to as direct tension indicator.4.Ordering Information4.1 Orders for direct tension
11、indicators under this specifica-tion shall include the following:4.1.1 Quantity(number of pieces);4.1.2 Name of product(direct tension indicator);4.1.3 Size,that is,nominal diameter;4.1.4 ASTM designation and year of issue(if not specified,current issue shall be used);4.1.5 Type required,8.8 or 10.9
12、(see 1.2);4.1.6 Coating type,if required(see 5.4);4.1.7 Source inspection,if required(Section 13);4.1.8 Certificates of compliance or test reports,if required(Section 15);and4.1.9 Any special requirements.1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the dire
13、ct responsibility of Subcommittee F16.02Steel Bolts,Nuts,Rivets and Washers.Current edition approved March 1,2013.Published March 2013.Originallyapproved in 1994.Last previous edition approved in 2007 as F959M 07.DOI:10.1520/F0959M-13.2For referenced ASTM standards,visit the ASTM website,www.astm.or
14、g,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 Research Council on Structural Connections at www.boltcoun-cil.org.*A Summary of Changes section appears at the end
15、 of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Materials and Manufacture5.1 Steel used in the manufacture of direct tension indica-tors shall be produced by the basic-oxygen or electric-furnaceprocess.5.2 Design:5.2.1
16、Direct tension indicators shall have a configurationproduced by extrusion,punching,pressing,or similar forming,to permit a measurable decrease in thickness when placed incompression.5.2.2 The design shall be such that the degree of plasticdeformation shall indicate the tension in a tightened structuralbolt.5.3 Heat Treatment:5.3.1 The heat treatment of DTIs is optional at the manu-facturers discretion,provided the DTIs meet all of the me-chanical and performance requirements.5.3.2If heat treatme
