1、Designation: A 563M 07METRICStandard Specification forCarbon and Alloy Steel Nuts Metric1This standard is issued under the fixed designation A 563M; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numbe
2、r in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This specification covers chemical and mechanical re-quir
3、ements for eight property classes of hex and hex-flangecarbon and alloy steel nuts for general structural and mechani-cal uses on bolts, studs, and other externally threaded parts.NOTE 1Throughout this specification, the term class means propertyclass.NOTE 2Requirements for the four classes 5, 9, 10
4、, and 12 areessentially identical with requirements given for these classes in ISO898/II. Requirements for Classes 8S and 10S are essentially identical withrequirements in an ISO 4775 Hexagon Nuts for High-Strength StructuralBolting with Large WidthAcross Flats, Product Grade B, Property Classes8 an
5、d 10. Classes 8S3 and 10S3 are not recognized in ISO standards.1.2 Classes 8S3 and 10S3 nuts have atmospheric corrosionresistance and weathering characteristics comparable to thoseof the steels covered in Specification A 588/A 588M. Theatmospheric corrosion resistance of these steels is substantiall
6、ybetter than that of carbon steel with or without copper addition(see 5.2). When properly exposed to the atmosphere, thesesteels can be used bare (uncoated) for many applications.1.3 The nut size range for which each class is applicable isgiven in the table on mechanical requirements.1.4 Appendix X1
7、 gives guidance to assist designers andpurchasers in the selection of a suitable class.1.5 Appendix X2 gives data on the properties of slotted hexnuts and hex jam nuts.NOTE 3This specification is the metric companion of SpecificationA 563.1.6 Terms used in this specification are defined in Termi-nol
8、ogy F 1789 unless otherwise defined herein.2. Referenced Documents2.1 ASTM Standards:2A 153/A 153M Specification for Zinc Coating (Hot-Dip) onIron and Steel HardwareA 325M Specification for Structural Bolts, Steel, HeatTreated 830 MPa Minimum Tensile Strength MetricA 394 Specification for Steel Tran
9、smission Tower Bolts,Zinc-Coated and BareA 490M Specification for High-Strength Steel Bolts,Classes 10.9 and 10.9.3, for Structural Steel Joints MetricA 588/A 588M Specification for High-Strength Low-AlloyStructural Steel, up to 50 ksi 345 MPa Minimum YieldPoint, with Atmospheric Corrosion Resistanc
10、eA 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel ProductsB 695 Specification for Coatings of Zinc MechanicallyDeposited on Iron and SteelD 3951 Practice for Commercial PackagingF 568M Specification for Carbon andAlloy Steel ExternallyThreaded Metric FastenersF 606M Test
11、Methods for Determining the MechanicalProperties of Externally and Internally Threaded Fasteners,Washers, and Rivets MetricF 812/F 812M Specification for Surface Discontinuities ofNuts, Inch and Metric SeriesF 1789 Terminology for F16 Mechanical FastenersG 101 Guide for Estimating the Atmospheric Co
12、rrosionResistance of Low-Alloy Steels2.2 ANSI Standards:3B 1.13M Metric Screw ThreadsM Profile1This 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 Dec.
13、1, 2007. Published January 2008. Originallyapproved in 1980. Last previous edition approved in 2006 as A 563M 06.2For 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
14、 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.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, P
15、O Box C700, West Conshohocken, PA 19428-2959, United States.Copyright by ASTM Intl (all rights reserved); Thu Feb 28 01:08:42 EST 2008Downloaded/printed byGuo Dehua (CNIS) pursuant to License Agreement. No further reproductions authorized.B 18.2.4.1M Metric Hex Nuts, Style 1B 18.2.4.2M Metric Hex Nu
16、ts, Style 2B 18.2.4.3M Metric Slotted Hex NutsB 18.2.4.4M Metric Hex Flange NutsB 18.2.4.5M Metric Hex Jam NutsB 18.2.4.6M Metric Heavy Hex Nuts2.3 ISO Standards:3ISO 898/II Mechanical Properties of Fasteners, Part II, NutsWith Specified Proof LoadsISO 4775 Hexagon Nuts for High-Strength Structural
17、Bolt-ing with Large Width Across FlatsProduct GradeBProperty Classes 8 and 103. Ordering Information3.1 Orders for nuts under this specification shall include thefollowing:3.1.1 Quantity (number of nuts);3.1.2 Nominal diameter and thread pitch;3.1.3 Dimensional style of nut (for example, hex, heavyh
18、ex, or hex flange);3.1.4 Property class of nut;3.1.5 Zinc CoatingSpecify the zinc coating process re-quired, hot-dip, mechanically deposited, or no preference (see4.7);3.1.6 Other FinishesSpecify other protective finish ifrequired;3.1.7 ASTM designation and year of issue; and3.1.8 Supplementary or s
19、pecial requirements.3.2 The strength requirements for any class of nut may besatisfied by substituting a nut of a higher class provided that thenut width across flats is the same. With the written approval ofthe purchaser, the supplier may substitute as follows: Class 12nuts for Classes 10, 9, and 5
20、; Class 10 nuts for Classes 9 and5; Class 9 nuts for Class 5; Class 10S for Class 8S; Class 8S3for Class 8S; and Class 10S3 for Classes 10S, 8S, and 8S3.NOTE 4Purchasers are cautioned that different classes of nuts havedifferent nut thickness (see 7.2 through 7.5). Dimensional suitability of thenut
21、for the intended application should be considered before approvingsubstitution of a higher class.NOTE 5Examples of ordering descriptions are: (1) 10 000 M12 31.75 hex nuts, Class 9,ASTMA 563MXX; (2) 2500 M24 3 3 heavy hexnuts, Class 10S, hot-dip zinc-coated, ASTM A 563MXX; and (3) 5000M10 3 1.5 hex
22、flange nuts, Class 10, ASTM A 563MXX.4. Materials and Manufacture4.1 Steel for nuts shall be made by the open-hearth, basic-oxygen, or electric-furnace process.4.2 Nuts may be made cold or hot by forming, pressing, orpunching, or may be machined from bar stock.4.3 Classes 10, 12, 10S, and 10S3 nuts
23、shall be heat treatedby quenching in a liquid medium from a temperature above thetransformation temperature and tempering at a temperature ofat least 425C.4.4 Classes 8S and 8S3 nuts made of any steel permitted forthese classes may be heat treated by quenching in a liquidmedium from a temperature ab
24、ove the transformation tempera-ture and tempering at a temperature of at least 425C.4.5 Class 8S nuts made of steel having a carbon content notexceeding 0.20 %, phosphorus not exceeding 0.04 %, andsulfur not exceeding 0.05 % by heat analysis may be heattreated by quenching in a liquid medium from a
25、temperatureabove the transformation temperature and need not be tem-pered. When this heat treatment is used, particular attentionshall be paid to the requirements in 6.1.4.6 Threads shall be formed, tapped, or machined.4.7 Zinc Coatings, Hot-Dip and Mechanically Deposited:4.7.1 When zinc-coated fast
26、eners are required, the pur-chaser shall specify the zinc coating process, for example,hot-dip, mechanically deposited, or no preference.4.7.2 When hot-dip is specified, the fasteners shall bezinc-coated by the hot-dip process in accordance with therequirements of Class C of Specification A 153/A 15
27、3M.4.7.3 When mechanically deposited is specified, the fasten-ers shall be zinc-coated by the mechanical-deposition processin accordance with the requirements of Class 55 of Specifica-tion B 695.4.7.4 When no preference is specified, the supplier mayfurnish either a hot-dip zinc coating in accordanc
28、e withSpecification A 153/A 153M, Class C, or a mechanicallydeposited zinc coating in accordance with Specification B 695,Class 55. All components of mating fasteners (bolts, nuts, andwashers) shall be coated by the same zinc coating process andthe suppliers option is limited to one process per item
29、 with nomixed processes in a lot.4.7.5 Hot-dip zinc coated nuts shall be tapped after zinccoating in accordance with the thread limits in 7.8.4.7.6 Mechanically deposited zinc-coated nuts for assemblywith mechanically deposited zinc-coated bolts shall be tappedoversize in accordance with the thread
30、limits in 7.8 prior tozinc coating and need not be retapped afterwards.NOTE 6It is the intent of 4.7 and 4.8 together with the requirementsspecified in 7.8 that galvanized bolts and nuts will assemble freely,regardless of source of supply.4.8 Hot-dip and mechanically deposited zinc-coated Class10S n
31、uts shall be provided with an additional lubricant thatshall be clean and dry to the touch.5. Chemical Composition5.1 Classes 5, 9, 8S, 10, 10S, and 12 shall conform to thechemical composition specified in Table 1.5.2 Classes 8S3 and 10S3 shall conform to the chemicalcomposition specified in Table 2
32、. See Guide G 101 for methodsof estimating corrosion resistance of low alloy steels.5.3 Resulfurized or rephosphorized steel, or both, are notsubject to rejection based on product analysis for sulfur orphosphorus unless misapplication is clearly indicated.5.4 Application of heats of steel to which b
33、ismuth, sele-nium, tellurium, or lead has been intentionally added shall notbe permitted for Classes 10, 12, 10S, and 10S3.5.5 Chemical analyses shall be performed in accordancewith Test Methods, Practices, and Terminology A 751.6. Mechanical Properties6.1 The hardness of nuts of each class shall no
34、t exceed themaximum hardness specified for the class in Table 3. This shallbe the only hardness requirement for nuts that are proof loadtested.A563M072Copyright by ASTM Intl (all rights reserved); Thu Feb 28 01:08:42 EST 2008Downloaded/printed byGuo Dehua (CNIS) pursuant to License Agreement. No fur
35、ther reproductions authorized.6.2 Unless proof load testing is specified in the inquiry andpurchase order, nuts of all classes in nominal thread diametersM4 and smaller, and nuts of all classes with proof loads greaterthan 530 kN, as specified in Table 4, may be furnished on thebasis of having a har
36、dness not less than the minimum hardnessspecified in Table 3.6.3 Nuts of all classes, except those covered in 6.2, shallwithstand the proof load stress specified for the diameter andclass of nut in Table 3.NOTE 7The proof load of a nut is the axially applied load the nut mustwithstand without thread
37、 stripping or rupture. Proof loads (Table 4) arecomputed by multiplying proof load stress (Table 3) by the nut threadstress area.7. Dimensions7.1 Unless otherwise specified, nuts shall be furnished plain(non-coated nor plated).7.2 Class 5 nuts in nominal thread diameters M36 andsmaller shall conform
38、 to dimensions for hex nuts, Style 1,given in ANSI B 18.2.4.1M. Class 5 nuts in nominal threaddiameters M42 and larger shall conform to dimensions forheavy hex nuts given in ANSI B 18.2.4.6M.7.3 Class 9 nuts in nominal thread diameters M20 andsmaller shall conform to dimensions for hex nuts, Style 2
39、,given in ANSI B 18.2.4.2M or for hex flange nuts given inANSI B 18.2.4.4M. When the dimensional style of nut is notdesignated by the purchaser, hex nuts, Style 2, in conformancewith ANSI B 18.2.4.2M shall be furnished. Class 9 nuts innominal thread diameters M24 to M36 inclusive shall conformto dim
40、ensions for hex nuts, Style 2, given in ANSIB 18.2.4.2M. Class 9 nuts in nominal thread diameters M42and larger shall conform to dimensions for heavy hex nutsgiven in ANSI B 18.2.4.6M.7.4 Class 10 nuts in nominal thread diameters M20 andsmaller shall conform to dimensions for hex nuts, Style 1,given
41、 in ANSI B 18.2.4.1M or for hex flange nuts given inANSI B 18.2.4.4M. When the dimensional style of nut is notdesignated by the purchaser, hex nuts, Style 1, in conformancewith ANSI B 18.2.4.1M shall be furnished. Class 10 nuts innominal thread diameters from M24 to M36 inclusive shallconform to dim
42、ensions for hex nuts, Style 1 given in ANSIB 18.2.4.1M.7.5 Class 12 nuts in nominal thread diameters M20 andsmaller shall conform to dimensions for hex nuts, Style 2,given in ANSI B 18.2.4.2M or for hex flange nuts given inANSI B 18.2.4.4M. When the dimensional style of the nut isnot designated by t
43、he purchaser, hex nuts, Style 2, in conform-ance with ANSI B 18.2.4.2M shall be furnished. Class 12 nutsin nominal thread diameters M24 to M36 inclusive shallconform to dimensions for hex nuts, Style 2, given in ANSIB 18.2.4.2M. Class 12 nuts in nominal thread diameters M42and larger shall conform t
44、o dimensions for heavy hex nutsgiven in ANSI B 18.2.4.6M.7.6 Classes 8S, 8S3, 10S, and 10S3 in nominal threaddiameters M12 to M36 inclusive shall conform to dimensionsfor heavy hex nuts given in ANSI B 18.2.4.6M.7.7 Unless otherwise specified, threads in nuts shall be themetric coarse thread series
45、as specified in ANSI B 1.13M, andshall have grade 6H tolerances.7.8 This requirement applies to nuts hot-dip and mechani-cally zinc-coated that are to be used on bolts, screws, or studsthat have metric coarse threads with Grade 6G tolerancesbefore zinc-coating and then are hot-dip or mechanicallyzin
46、c-coated, except as noted in 7.9, in accordance with 4.7.2and 4.7.3. Such nuts shall be tapped oversize to have internalthreads with maximum and minimum limits that exceed themaximum and minimum limits specified for metric coarseinternal threads with Grade 6H tolerances by the followingdiametral all
47、owances:Nut DiameterDiametral Allowance,mM5 156M6 200M8 255M10 310M12 365M14 and M16 420M20 and M22 530M24 and M27 640M30 750M36 860M42 970M48 1080M56 1190M64 to M100 1300NOTE 8Bolts, screws, and studs in diameters smaller than M10 arenot normally hot-dip zinc-coated.7.8.1 Internal threads shall be
48、subject to acceptance gagingusing GO and HI thread plug gages having size limits asestablished in 7.8. Threads of nuts tapped after zinc coating(4.7) shall meet GO and HI thread plug gaging requirements astapped. Threads of nuts tapped prior to zinc coating (4.8) shallmeet HI thread plug gaging requ
49、irements prior to zinc coatingand GO thread plug gaging requirements after zinc coating.7.9 Nuts to be used on bolts, screws, or studs that arehot-dip or mechanically zinc-coated to requirements other thanspecified in 7.8 shall be tapped oversize by a diametralallowance sufficient to permit assembly on the coated exter-nally threaded fastener.NOTE 9If the over-tapping diametral allowance is greater than thelimit specified in 7.8, the purchaser is cautioned that the nut may not meetthe proof load stress specified in Table 3.TABLE 1 Chemical Requirement
