ASTM_F_912_-_11.pdf

Designation:F91211Standard Specification forAlloy Steel Socket Set Screws1This standard is issued under the fixed designation F912;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 socket-set screws(SSS)in nominaldiameters 0.060 through 2 in.having hardnesses 45 to 53 HRC.1.2 These set screws are intended for compression applica-tions only and are not customarily subjected to embrittlementtests.For tensile applications,consult with the manufacturerfor proper alloy and hardness.1.3 The values stated in inch-pound units are to be regardedas standard.No other units of measurement are included in thisstandard.NOTE1A complete metric companion to Specification F912 has beendevelopedF912M;therefore,no metric equivalents are shown in thisSpecification.1.4 The hazard statement pertains only to the test methodsection,Section 11 of this specification.This standard does notpurport to address all of the safety concerns,if any,associatedwith its use.It is the responsibility of the user of this standardto establish appropriate safety and health practices anddetermine the applicability of regulatory limitations prior touse.2.Referenced Documents2.1 ASTM Standards:2A751 Test Methods,Practices,and Terminology for Chemi-cal Analysis of Steel ProductsE3 Guide for Preparation of Metallographic SpecimensE112 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 SeriesF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF2328 Test Method for Determining Decarburization andCarburization in Hardened and Tempered Threaded SteelBolts,Screws and Studs2.2 ASME Standards:3B18.3 Socket Cap,Shoulder and Set Screw,Inch Series4B18.24 Part Identifying Number(PIN)Code System Stan-dard for B18 Fastener Products3.Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity(number of screws).3.1.2 Dimensions,including nominal thread designation,threads per inch,nominal screw length(inches)and pointconfiguration.A standard part number may be used for thisdefinition.3.1.3 Name of the screw(SSS).3.1.4 Coating,if required.See 4.4.3.1.5 Certification,if required.See 14.1.3.1.6 ASTM designation and year of issue.3.1.7 Any special or supplemental requirements.3.1.8 For establishment of a part identifying system,seeASME B18.24.4.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 The screws may be forged,formed,extruded,machined,or ground to meet the dimensional characteristics and perfor-mance requirements.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.1,2011.Published November 2011.Originallyapproved in 1986.Last previous edition approved in 2004 as F912 041.DOI:10.1520/F0912-11.2For 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.4Available 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 States1 4.3 Set screws shall be heat treated by quenching in oil fromabove the transformation temperature and then tempered byreheating to meet the hardness range specified in 6.2.4.4 Standard FinishesUnless otherwise specified,thescrews shall be furnished with one of the following standardsurfaces as manufactured,at the option of the manufacturer;(1)bright uncoated;(2)thermal black oxide;or(3)chemical blackoxide.Hydrogen embrittlement tests shall not be required forscrews furnished in these conditions.4.5 Protective Coatings:4.5.1 When a protective finish other