ASTM_F_912M_-_11.pdf

Designation:F912M11Standard Specification forAlloy Steel Socket Set Screws(Metric)1This standard is issued under the fixed designation F912M;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.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)M1.6 throughM24 sizes having hardnesses 45 to 53 HRC,ISO 898/5property class 45H.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 SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.NOTE1This specification is the metric companion of SpecificationF912.1.4 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 ofMaterialsF606M Test Methods for Determining the Mechanical Prop-erties of Externally and Internally Threaded Fasteners,Washers,and Rivets(Metric)F788/F788M Specification for Surface Discontinuities ofBolts,Screws,and Studs,Inch and Metric SeriesF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF2328M Test Method for Determining Decarburization andCarburization in Hardened and Tempered Threaded SteelBolts,Screws and Studs(Metric)2.2 ASME Standards:3B18.3.6M Hexagon Socket Set Screws Metric SeriesB18.24 Part Identifying Number(PIN)Code System Stan-dard for B18 Fastener Products2.3 ISO Standard:898/5 Mechanical Properties of FastenersSet Screws andSimilar Threaded Fasteners Not Under Tensile Stress43.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,thread pitch,nominal screw length(millimetres)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 B18.24.3.2 Example50 000 pieces M6x1x8 cone point SSScertification per 14.1ASTM F912M_ _(state issue date),or25000pcsB1836A060008KSSScertificationper14.1ASTM F912M _ _(state issue date).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 August 2004.Originallyapproved in 1985.Last previous edition approved in 2004 as F912M 041.DOI:10.1520/F0912M-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 10016-5990.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036.*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.Material and Manufacture4.1 The screws shall be fabricated from alloy steel made toa fine grain practice.In the event of controversy over grainsize,referee tests on finished screws conducted in accordancewith Test Methods E112 shall prevail.4.2 The screw may be forged,formed,extruded,machined,or ground to meet the dimensional characteristics and perfor-mance requirements.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)th