ASTM_F_2437_-_14.pdf

Designation:F243714Standard Specification forCarbon and Alloy Steel Compressible-Washer-Type DirectTension Indicators for Use with Cap Screws,Bolts,Anchors,and Studs1This standard is issued under the fixed designation F2437;the number immediately following the designation indicates the year oforiginal adoption or,in the case of 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.1.Scope*1.1 This specification covers the requirements for carbonand alloy steel compressible-washer-type direct tension indi-cators capable of indicating a specified bolt tension in capscrews,bolts,anchors,and studs.1.2 Direct tension indicators in nominal diameter sizes14through 212in.are covered.1.3 There are two Types of DTIs covered by thisspecification,Type 1 and Type 2.1.3.1 Type 1 DTIs are suitable for comparatively largebearing surfaces.Type 1 DTIs are available in Grades 55 and105,which differ in the amount of tension they indicate at aprescribed gap(see Table 1).NOTE1Examples of a comparatively large bearing surface wouldinclude heavy hex bolts,heavy hex nuts,and so forth.1.3.2 Type 2 DTIs are suitable for comparatively smallerbearing surfaces.Type 2 DTIs are available in Grades 5 and 8,which differ in the amount of tension they indicate at aprescribed gap(see Table 1).NOTE2Examples of a comparatively small bearing surface wouldinclude a hex cap screw,hex nut,and so forth.1.4 Direct tension indicators are intended for installationunder a bolt or cap screw head,a hex nut,or against a hardenedwasher or other flat hardened surface.1.5 The values stated in inch-pound units are to be regardedas standard.No other units of measurement are included in thisstandard.1.6 The following precautionary statement pertains only tothe test method portions,Section 12 and Appendix XI of thisspecification: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 Documents2.1 ASTM Standards:2A193/A193M Specification for Alloy-Steel and StainlessSteel Bolting for High Temperature or High PressureService and Other Special Purpose ApplicationsA194/A194M Specification for Carbon andAlloy Steel Nutsfor Bolts for High Pressure or High Temperature Service,or BothA307 Specification for Carbon Steel Bolts,Studs,andThreaded Rod 60 000 PSI Tensile StrengthA325 Specification for Structural Bolts,Steel,Heat Treated,120/105 ksi Minimum Tensile StrengthA354 Specification for Quenched and Tempered Alloy SteelBolts,Studs,and Other Externally Threaded FastenersA449 Specification for Hex Cap Screws,Bolts and Studs,Steel,Heat Treated,120/105/90 ksi Minimum TensileStrength,General UseA563 Specification for Carbon and Alloy Steel NutsB633 Specification for Electrodeposited Coatings of Zinc onIron and SteelB695 Specification for Coatings of Zinc Mechanically De-posited on Iron and SteelF436 Specification for Hardened Steel WashersF606 Test Methods for Determining the Mechanical Proper-ties of Externally and Internally Threaded Fasteners,Washers,Direct Tension Indicators,and RivetsF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1554 Specification for Anchor Bolts,Steel,36,55,and105-ksi Yield StrengthF1941 Specification for Electrodeposited Coatings onThreaded Fasteners(Unified Inch Screw Threads(UN/UNR)1This specification is under the 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 June 1,2014.Published June 2014.Originallyapproved in 2006.Last previous edition approved in 2012 as F243712.DOI:10.1520/F2437-14.2For 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.*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 States1 2.2 ASME Standards:3ASME B18.2.1 Square and Hex Bolts and Screws,InchSeriesASME B18.2.8 Clearance Holes for Bolts Screws,and Studs2.3 SAE Standard:4SAE J429 Mechanical and Material Requirements for Exter-nally Threaded FastenersSAE J995 Mechanical and Material Requirements for SteelNuts3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 compressible-washer-type direct tension indicator,na washer-type element inserted under the cap screw or bolthead,hex nut,or hardened washer,having the capability ofindicating the achievement of a required bolt tension by thedegree of direct tension indicator plastic deformation.He