ASTM_F_835_-_13.pdf

Designation:F83513Standard Specification forAlloy Steel Socket Button and Flat Countersunk Head CapScrews1This standard is issued under the fixed designation F835;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 covers the requirements for quenchedand tempered alloy steel hexagon socket button(SBHCS)0.060 through 0.625 thread sizes and flat countersunk(SFHCS)0.060 through 1.5 thread sizes head cap screws having materialproperties for high-strength requirements.1.2 Fasteners meeting this specification are intended forshear-type applications and have tensile requirements rangingfrom 122 to 150 ksi.1.3 The values stated in inch-pound units are to be regardedas standard.No other units of measurement are included in thisstandard.1.4 The hazard statement applies only to the test methodsection,Section 11,of this specification.This standard doesnot purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.2.Referenced Documents2.1 ASTM Standards:2A751 Test Methods,Practices,and Terminology for Chemi-cal Analysis of Steel ProductsD3951 Practice for Commercial PackagingE3 Guide for Preparation of Metallographic SpecimensE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE112 Test Methods for Determining Average Grain SizeE384 Test Method for Knoop and Vickers Hardness ofMaterialsF606 Test Methods for Determining the Mechanical Proper-ties of Externally and Internally Threaded Fasteners,Washers,Direct Tension Indicators,and RivetsF788/F788M Specification for Surface Discontinuities ofBolts,Screws,and Studs,Inch and Metric Series2.2 ASME Standards:3B18.3 Socket Cap,Shoulder and Set ScrewsInch SeriesB18.24 Part Identifying Number(PIN)Code System Stan-dard for B18 Fastener Products3.Ordering Information3.1 Orders for material under this specification shall includethe following:3.1.1 Quantity(number of screws).3.1.2 Dimensions,including nominal thread designation,thread pitch,and nominal screw length(inches).A standardpart number may be used for this definition.3.1.3 Name of the screw:SBHCS or SFHCS.3.1.4 Coating,if required.If a protective finish other thanblack oxide is required,it must be specified on the order orproduct standard.3.1.5 Lot testing,if required(see 10.3).3.1.6 Certification,if required(see 14.1).3.1.7 ASTM designation and year of issue.3.1.8 Any special requirements.3.1.9 For establishment of a part identifying system,seeASME B18.24.3.2 Example1000 pieces 0.250 20 0.375 SBHCS lottensile test.ASTM F835XX.4.Materials and Manufacture4.1 The screws shall be fabricated from alloy steel made tofine grain practice.In the event of controversy over grain size,referee tests on finished screws conducted in accordance withTest Methods E112 shall prevail.4.2 Screws shall be hot or cold upset or extruded,or both.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 Nov.1,2013.Published January 2014.Originallyapproved in 1986.Last previous edition approved in 2012 as F835 12.DOI:10.1520/F0835-13.2For 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 Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Three Park Ave.,New York,NY 10016-5990,http:/www.asme.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 States1 4.3 Unless otherwise specified,threads shall be rolled fordiameters through 0.625 in.and for screw lengths through 4 in.For diameters and lengths other than this,threads may berolled,cut or ground.4.4 Screws shall be heat treated by quenching in oil fromabove the transformation temperature and then tempering byreheating to at least 650F to be within the hardness rangespecified in Table 1.4.4.1 The minimum tempering temperature may be verifiedby submitting screws to 635F for 30 min at temperature.Theaverage cross-section hardness of three readings on the screwbefore and after retempering shall not differ by more than 20DPH.4.5 When protective or decorative coatings are applied tothe screws,precautions as required by the coatings shall betaken to prevent embrittlement.5.Chemical Compos