ASTM_F_835M_-_11.pdf

Designation:F835M11Standard Specification forAlloy Steel Socket Button and Flat Countersunk Head CapScrews(Metric)1This standard is issued under the fixed designation F835M;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 hexagon socket button(SBHCS)andflat countersunk(SFHCS)head cap screws M3 through M20thread sizes having material properties of ISO 898/1 PropertyClass 12.9.1.2 Fasteners meeting this specification are intended forshear type applications and have tensile requirements equiva-lent to ISO 898/1 Property Class 10.9.1.3 The hazard statement pertains only to the test methodsection,Section 11 of this specification.This standard does notpurport to address all of the safety problems,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 InspectionF2328 Test Method for Determining Decarburization andCarburization in Hardened and Tempered Threaded SteelBolts,Screws and Studs2.2 ANSI/ASME Standards:B18.3.4M Hexagon Socket Button Head Cap Screws3B18.3.5MHexagon Socket Flat Countersunk Head CapScrews3B18.24 Part Identifying Number(PIN)Code System Stan-dard for B18 Fastener Products42.3 ISO Standard:898/1 Mechanical properties of fasteners made of carbonsteel and alloy steel-Part 1:Bolts,screws and studs withspecified property classes-Coarse thread and fine pitchthread33.Ordering Information3.1 Orders for material under this specification shall in-clude:3.1.1 Quantity(number of screws).3.1.2 Dimensions,including nominal thread designation,thread pitch and nominal screw length(millimetres).A stan-dard part 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 Certification,if required(see 14.1).3.1.6 ASTM designation and year of issue,and3.1.7 Any special requirements.3.1.8 For establishment of a part identifying system,seeASME B18.24.1.3.2 Example1000 pieces M6 1 25 SBHCS,ASTMF835M XX,test report required.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 1,2011.Published June 2011.Originallyapproved in 1983.Last previous edition approved in 2004 as F835M 04.DOI:10.1520/F0835M-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 National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Available 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.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 cold upset or extruded,or both.4.3 Screws shall be roll threaded.4.4 Screws shall be heat treated by quenching in oil fromabove the transformation temperature and then tempering byreheating to at least 380C to be within the hardness rangespecified in Table 1.4.4.1 Minimum tempering temperature may be verified bysubmitting screws to 370C 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 coat