1、Designation:A574M12Standard Specification forAlloy Steel Socket-Head Cap Screws(Metric)1This standard is issued under the fixed designation A574M;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 p
2、arentheses 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 tempe
3、red alloy steel hexagon socket-head cap screws,1.6mm through 48 mm in diameter having a minimum ultimatetensile strength of 1220 MPa.1.2 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 compan
4、ion of SpecificationA574.1.3 The following hazard caveat pertains only to the testmethod portions,sections 5.1,5.6,8,and 12,of this specifi-cation.This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard t
5、o establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A751 Test Methods,Practices,and Terminology for Chemi-cal Analysis of Steel ProductsE112 Test Methods for Determining Average Grain S
6、izeF606M 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-chanica
7、l Properties and Performance InspectionF1789 Terminology for F16 Mechanical FastenersF1940 Test Method for Process Control Verification toPrevent Hydrogen Embrittlement in Plated or CoatedFastenersF2282 Specification for QualityAssurance Requirements forCarbon and Alloy Steel Wire,Rods,and Bars for
8、Me-chanical FastenersF2328M Test Method for Determining Decarburization andCarburization in Hardened and Tempered Threaded SteelBolts,Screws and Studs(Metric)2.2 ASME Standards:3B18.3.1M Metric Socket Head Cap ScrewsB18.12 Glossary of Terms for Mechanical FastenersB18.24 Part Identifying Number(PIN)
9、Code System Stan-dard for B18 Fastener Products3.Terminology3.1 Definitions of Terms Specific to This StandardThedefinition of terms used in this specification shall be asspecified in Terminology F1789,ASME B18.12,or the appli-cable referenced standards,unless otherwise defined herein.Inthe event th
10、at there are differences for a given term ASTMdefinitions shall be used.4.Ordering Information4.1 Orders for socket head cap screws under this specifica-tion shall include the following information:4.1.1 ASTM designation and year of issue.4.1.2 Name of the screw(SHCS).4.1.3 Quantity(number of pieces
11、 by size).4.1.4 Dimensions,including nominal thread designation,thread,pitch,and nominal screw length(millimeters).4.2 Orders for socket head cap screws shall include thefollowing optional requirements if specified by the purchaser:4.2.1 Inspection at point of manufacture.4.2.2 Coating,if a protecti
12、ve finish other than those,whichare described in 5.5,is required,it must be specified(see 5.6).4.2.3 Certified test reports,as required(see Section 15).4.2.4 Additional testing(see 12.1).4.2.5 Special packaging(see 18.1.2).1This specification is under the jurisdiction of ASTM Committee F16 onFastene
13、rs and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,Nuts,Rivets and Washers.Current edition approved April 1,2012.Published May 2012.Originallyapproved in 1980.Last previous edition approved in 2011 as A574M 11.DOI:10.1520/A0574M-12.2For referenced ASTM standards,visit the ASTM
14、 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.,N
15、ew 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 4.2.6 Special requirements.4.2.7 For establishment of a part identifying system seeA
16、SME B18.24.5.Materials and Manufacture5.1 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.5.2 Screws in sizes through M20,and with lengths throughten times the nominal product size or 150 mm,whichever isshorter,shall be cold headed,except that when specified by thepurchaser the screws shall be hot headed.Larger sizes andlonger length
