Designation:A563M–01
METRIC
Standard Specification for
Carbon and Alloy Steel Nuts[Metric]1
This standard is issued under thefixed designation A563M;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript 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*
1.1This specification covers chemical and mechanical re-quirements for eight property classes of hex and hex-flange carbon and alloy steel nuts for general structural and mechani-cal uses on bolts,studs,and other externally threaded parts. N OTE1—Throughout this specification,the term class means property class.
N OTE2—Requirements for the four classes5,9,10,and12are essentially identical with requirements given for these classes in ISO 898/II.Requirements for Classes8S and10S are essentially identical with requirements in an ISO4775Hexagon Nuts for High-Strength Structural Bolting with Large Width Across Flats,Product Grade B,Property Classes 8and10.Classes8S3and10S3are not recognized in ISO standards. 1.2Classes8S3and10S3nuts have atmospheric corrosion resistance and weathering characteristics comparable to those of the steels covered in Specification A588/A588M.The atmospheric corrosion resistance of these steels is substantially better than that of carbon steel with or without copper addition (see5.2).When properly exposed to the atmosphere,these steels can be used bare(uncoated)for many applications. 1.3The nut size range for which each class is applicable is given in the table on mechanical requirements.
1.4Appendix X1gives guidance to assist designers and purchasers in the selection of a suitable class.
1.5Appendix X2gives data on the properties of slotted hex nuts and hex jam nuts.
N OTE3—This specification is the metric companion of Specification A563.
2.Referenced Documents
2.1ASTM Standards:
A153Specification for Zinc Coating(Hot-Dip)on Iron and Steel Hardware2A325M Specification for High-Strength Bolts for Struc-tural Steel Joints[Metric]3
A394Specification for Steel Transmission Tower Bolts, Zinc-Coated and Bare3
A490M Specification for High-Strength Steel Bolts, Classes10.9and10.9.3,for Structural Steel Joints[Met-ric]3
A588/A588M Specification for High-Strength Low-Alloy Structural Steel with50ksi[345MPa]Minimum Yield Point to4in.[100mm]Thick4
A751Test Methods,Practices,and Terminology for Chemical Analysis of Steel Products5
B695Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel6
D3951Practice for Commercial Packaging7
F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers,and Rivets[Metric]3
F812/F812M Specification for Surface Discontinuities of Nuts,Inch and Metric Series3
G101Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels8
2.2ANSI Standards:9
B1.13M Metric Screw Threads—M Profile
B18.2.4.1M Metric Hex Nuts,Style1
B18.2.4.2M Metric Hex Nuts,Style2
B18.2.4.3M Metric Slotted Hex Nuts
B18.2.4.4M Metric Hex Flange Nuts
B18.2.4.5M Metric Hex Jam Nuts
B18.2.4.6M Metric Heavy Hex Nuts
2.3ISO Standards:9
ISO898/II Mechanical Properties of Fasteners,Part II,Nuts
1This specification is under the jurisdiction of ASTM Committee F16on Fasteners and is the direct responsibility of Subcommittee F16.02on Steel Bolts, Nuts,Rivets,and Washers.
Current edition approved Oct.10,2001.Published December2001.Originally published as A563M–80.Last previous edition A563M–00.
2Annual Book of ASTM Standards,V ol01.06.
3Annual Book of ASTM Standards,V ol01.08.
4Annual Book of ASTM Standards,V ol01.04.
5Annual Book of ASTM Standards,V ol01.03.
6Annual Book of ASTM Standards,V ol02.05.
7Annual Book of ASTM Standards,V ol15.09.
8Annual Book of ASTM Standards,V ol03.02.
9Available from American National Standards Institute,11West42nd St.,13th Floor,New York,NY10036.
1
*A Summary of Changes section appears at the end of this standard. Copyright©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States.
With Specified Proof Loads
ISO4775Hexagon Nuts for High-Strength Structural Bolt-ing with Large Width Across Flats—Product Grade B—Property Classes8and10
3.Ordering Information
3.1Orders for nuts under this specification shall include the following:
3.1.1Quantity(number of nuts);
3.1.2Nominal diameter and thread pitch;
3.1.3Dimensional style of nut(for example,hex,heavy hex,or hexflange);
3.1.4Property class of nut;
3.1.5Zinc Coating—Specify the zinc coating process re-quired,hot-dip,mechanically deposited,or no preference(see
4.7);
3.1.6Other Finishes—Specify other protectivefinish if required;
3.1.7ASTM designation and year of issue;and
3.1.8Any special requirements.
3.2The strength requirements for any class of nut may be satisfied by substituting a nut of a higher class provided that the nut width acrossflats is the same.With the written approval of the purchaser,the supplier may substitute as follows:Class12 nuts for Classes10,9,and5;Class10nuts for Classes9and 5;Class9nuts for Class5;Class10S for Class8S;Class8S3 for Class8S;and Class10S3for Classes10S,8S,and8S3. N OTE4—Purchasers are cautioned that different classes of nuts have different nut thickness(see7.2through7.5).Dimensional suitability of the nut for the intended application should be considered before approving substitution of a higher class.
N OTE5—Examples of ordering descriptions are:(a)10000M123 1.75hex nuts,Class9,ASTM A563M–XX;(b)2500M2433heavy hex nuts,Class10S,hot-dip zinc-coated,ASTM A563M–XX;and(c)5000 M1031.5hexflange nuts,Class10,ASTM A563M–XX.
4.Materials and Manufacture
4.1Steel for nuts shall be made by the open-hearth,basic-oxygen,or electric-furnace process.
4.2Nuts may be made cold or hot by forming,pressing,or punching,or may be machined from bar stock.
4.3Classes10,12,10S,and10S3nuts shall be heat treated by quenching in a liquid medium from a temperature above the transformation temperature and tempering at a temperature of at least425°C.
4.4Classes8S and8S3nuts made of any steel permitted for these classes may be heat treated by quenching in a liquid medium from a temperature above the transformation tempera-ture and tempering at a temperature of at least425°C.
4.5Class8S nuts made of steel having a carbon content not exceeding0.20%,phosphorus not exceeding0.04%,and sulfur not exceeding0.05%by heat analysis may be heat treated by quenching in a liquid medium from a temperature above the transformation temperature and need not be tem-pered.When this heat treatment is used,particular attention shall be paid to the requirements in6.1.
4.6Threads shall be formed,tapped,or machined.
4.7Zinc Coatings,Hot-Dip and Mechanically Deposited: 4.7.1When zinc-coated fasteners are required,the pur-chaser shall specify the zinc coating process,for example,hot-dip,mechanically deposited,or no preference.
4.7.2When hot-dip is specified,the fasteners shall be zinc-coated by the hot-dip process in accordance with the requirements of Class C of Specification A153.
4.7.3When mechanically deposited is specified,the fasten-ers shall be zinc-coated by the mechanical-deposition process in accordance with the requirements of Class50of Specifica-tion B69
5.
4.7.4When no preference is specified,the supplier may furnish either a hot-dip zinc coating in accordance with Specification A153,Class C,or a mechanically deposited zinc coating in accordance with Specification B695,Class50.All components of mating fasteners(bolts,nuts,and washers)shall be coated by the same zinc coating process and the supplier’s option is limited to one process per item with no mixed processes in a lot.
4.7.5Hot-dip zinc coated nuts shall be tapped after zinc coating in accordance with the thread limits in7.8.
4.7.6Mechanically deposited zinc-coated nuts for assembly with mechanically deposited zinc-coated bolts shall be tapped oversize in accordance with the thread limits in7.8prior to zinc coating and need not be retapped afterwards.
N OTE6—It is the intent of4.7and4.8together with the requirements specified in7.8that galvanized bolts and nuts will assemble freely, regardless of source of supply.
4.8Hot-dip and mechanically deposited zinc-coated Class 10S nuts shall be provided with an additional lubricant that shall be clean and dry to the touch.
5.Chemical Composition
5.1Classes5,9,8S,10,10S,and12shall conform to the chemical composition specified in Table1.
5.2Classes8S3and10S3shall conform to the chemical composition specified in Table2.See Guide G101for methods of estimating corrosion resistance of low alloy steels.
5.3Resulfurized or rephosphorized steel,or both,are not subject to rejection based on product analysis for sulfur or phosphorus unless misapplication is clearly indicated.
5.4Application of heats of steel to which bismuth,sele-nium,tellurium,or lead has been intentionally added shall not be permitted for Classes10,12,10S,and10S3.
TABLE1Chemical Requirements
Property
Class of
Nut
Composition,%
Analysis Carbon Manga-
nese,
min
Phos-
phorus,
max
Sulfur,
max
5,9,8S heat
product
0.55max
0.58max
...
...
0.04
0.048
0.15A
...
10B,10S heat
product
0.55max
0.58max
0.30
0.27
0.04
0.048
0.05
0.058
12B heat
product
0.20–0.55
0.18–0.58
0.60
0.57
0.04
0.048
0.05
0.058
8S3,10S3See Table2
A For Classes5and9,a sulfur content of0.23%max.is acceptable with the purchasers approval.
B For Classes10and
12,a sulfur content of0.15%max.is acceptable provided the manganese is1.35%min.
5.5Chemical analyses shall be performed in accordance with Test Methods A 751.
6.Mechanical Properties
6.1The hardness of nuts of each class shall not exceed the maximum hardness specified for the class in Table 3.This shall be the only hardness requirement for nuts that are proof load tested.
6.2Unless proof load testing is specified in the inquiry and purchase order,nuts of all classes in nominal thread diameters M4and smaller,and nuts of all classes with proof loads greater than 530kN,as specified in Table 4,may be furnished on the basis of having a hardness not less than the minimum hardness specified in Table 3.
6.3Nuts of all classes,except those covered in 6.2,shall withstand the proof load stress specified for the diameter and class of nut in Table 3.
N OTE 7—The proof load of a nut is the axially applied load the nut must
withstand without thread stripping or rupture.Proof loads (Table 4)are computed by multiplying proof load stress (Table 3)by the nut thread stress area.
7.Dimensions
7.1Unless otherwise specified,nuts shall be furnished plain (non-coated nor plated).
7.2Class 5nuts in nominal thread diameters M36and smaller shall conform to dimensions for hex nuts,Style 1,given in ANSI B 18.2.4.1M.Class 5nuts in nominal thread diameters M42and larger shall conform to dimensions for heavy hex nuts given in ANSI B 18.2.4.6M.
7.3Class 9nuts in nominal thread diameters M20and smaller shall conform to dimensions for hex nuts,Style 2,given in ANSI B 18.2.4.2M or for hex flange nuts given in ANSI B 18.2.4.4M.When the dimensional style of nut is not designated by the purchaser,hex nuts,Style 2,in conformance with ANSI B 18.2.4.2M shall be furnished.Class 9nuts in nominal thread diameters M24to M36inclusive shall conform
TABLE 2Chemical Requirements for Classes 8S3and 10S3Nuts
Element
Composition,%
Steel Analyses for Class 8S3Nuts A
Class 10S3Nuts N
A B C D E F Carbon:
Heat analysis ...0.33–0.400.38–0.480.15–0.250.15–0.250.20–0.250.20–0.250.20–0.53Product analysis ...
0.31–0.42
0.36–0.50
0.14–0.26
0.14–0.26
0.18–0.27
0.19–0.26
0.19–0.55
Manganese:Heat analysis ...0.90–1.200.70–0.900.80–1.350.40–1.200.60–1.000.90–1.200.40min Product analysis ...0.86–1.240.67–0.930.76–1.390.36–1.240.56–1.040.86–1.240.37min
Phosphorus:Heat analysis 0.07–0.150.040max 0.06–0.120.035max 0.040max 0.040max 0.040max 0.046max Product analysis 0.07–0.1550.045max 0.06–0.1250.040max 0.045max 0.045max 0.045max 0.052max
Sulfur:
Heat analysis 0.050max 0.050max 0.050max 0.040max 0.050max 0.040max 0.040max 0.050max Product analysis 0.055max 0.055max 0.055max 0.045max 0.055max 0.045max 0.045max 0.055max
Silicon:
Heat analysis 0.20–0.900.15–0.350.30–0.500.15–0.350.25–0.500.15–0.350.15–Product analysis 0.15–0.950.13–0.370.25–0.550.13–0.370.20–0.550.13–0.370.13–
Copper:
Heat analysis 0.25–0.550.25–0.450.20–0.400.20–0.500.30–0.500.30–0.600.20–0.400.20min Product analysis 0.22–0.580.22–0.480.17–0.430.17–0.530.27–0.530.27–0.630.17–0.430.17min
Nickel:
Heat analysis    1.00max 0.25–0.450.50–0.800.25–0.500.50–0.800.30–0.600.20–0.400.20min B Product analysis    1.03max 0.22–0.480.47–0.830.22–0.530.47–0.830.27–0.630.17–0.430.17min
Chromium:
Heat analysis 0.30–1.250.45–0.650.50–0.750.30–0.500.50–1.000.60–0.900.45–0.650.30min Product analysis 0.25–1.300.42–0.680.47–0.830.27–0.530.45–1.050.55–0.950.42–0.680.25min
Vanadium:
Heat analysis .........0.020min ............Product analysis .........0.010min ............
Molybdenum:Heat analysis ......0.06max ...0.10max ......0.15min B Product analysis ......0.07max ...0.11max ......0.14min
Titanium:
Heat analysis ............0.05max .........Product analysis
.
.......................
A Class 8S3nuts may be made of any of the listed
steel analyses.Selection of steel analysis shall be the option of the manufacturer.B
Nickel or molybdenum may be used.
to dimensions for hex nuts,Style2,given in ANSI B18.2.4.2M.Class9nuts in nominal thread diameters M42 and larger shall conform to dimensions for heavy hex nuts given in ANSI B18.2.4.6M.
7.4Class10nuts in nominal thread diameters M20and smaller shall conform to dimensions for hex nuts,Style1, given in ANSI B18.2.4.1M or for hexflange nuts given in ANSI B18.2.4.4M.When the dimensional style of nut is not designated by the purchaser,hex nuts,Style1,in conformance with ANSI B18.2.4.1M shall be furnished.Class10nuts in nominal thread diameters from M24to M36inclusive shall conform to dimensions for hex nuts,Style1given in ANSI B18.2.4.1M.
7.5Class12nuts in nominal thread diameters M20and smaller shall conform to dimensions for hex nuts,Style2, given in ANSI B18.2.4.2M or for hexflange nuts given in ANSI B18.2.4.4M.When the dimensional style of the nut is not designated by the purchaser,hex nuts,Style2,in conform-ance with ANSI B18.2.4.2M shall be furnished.Class12nuts in nominal thread diameters M24to M36inclusive shall conform to dimensions for hex nuts,Style2,given in ANSI B18.2.4.2M.Class12nuts in nominal thread diameters M42 and larger shall conform to dimensions for heavy hex nuts given in ANSI B18.2.4.6M.
7.6Classes8S,8S3,10S,and10S3in nominal thread diameters M12to M36inclusive shall conform to dimensions for heavy hex nuts given in ANSI B18.2.4.6M.
7.7Unless otherwise specified,threads in nuts shall be the metric coarse thread series as specified in ANSI B1.13M,and shall have grade6H tolerances.
7.8This requirement applies to nuts hot-dip and mechani-cally zinc-coated that are to be used on bolts,screws,or studs that have metric coarse threads with Grade6G tolerances before zinc-coating and then are hot-dip or mechanically zinc-coated,except as noted in7.9,in accordance with4.7.2 and4.7.3.Such nuts shall be tapped over-size to have internal threads with maximum and minimum limits that exceed the maximum and minimum limits specified for metric coarse
TABLE3Mechanical Requirements of Nuts
Nominal Diameter
Property Class
55(overtapped)9
Proof
Load
Stress,
MPa
Hardness Proof
Load
Stress,
MPa
Hardness
Proof
Load
Stress,
MPa
Hardness Rockwell Vickers Rockwell Vickers Rockwell Vickers
min max min max min max min max min max min max
M1.6to M2.5
900
...
B85
...
C30
...
170
...
302
M5and M6580B70C30130302465B70C30130302915B89C30188302 M8and M10590B70C301303024
70B70C30130302940B89C30188302 M12to M16610B70C30130302490B70C30130302950B89C30188302 M20to M36630B78C30146302500B78C30146302920B89C30188302 M42to M100630B70C30128302500B70C30128302920B89C30188302
Property Class
101212(Overtapped)
Proof Load Stress, MPa
Hardness Proof
Load
Stress,
MPa
Hardness Proof
Load
Stress,
MPa
Hardness
Rockwell Vickers Rockwell Vickers Rockwell Vickers min max min max min max min max min max min max
M1.6to
M3to M41040C26C362723531150C26C36272353
M5and M6920C26C36272353 M8and M101160C26C36272353930C26C36272353 M12to M161050C26C362723531190C26C36272353950C26C36272353 M20to M361060C26C362723531200C26C36272353960C26C36272353 1200C26C36272353960C26C36272353
Property Class
8S and8S310S and10S310S(Overtapped)
Proof Load Stress, MPa
Hardness Proof
Load
Stress,
MPa
Hardness Proof
Load
Stress,
MPa
Hardness
include中文Rockwell Vickers Rockwell Vickers Rockwell Vickers min max min max min max min max min max min max
M12to M361075B89C381883721245C26C382723721165C26C38272372
internal threads with Grade 6H tolerances by the following diametral allowances:
Nut Diameter Diametral Allowance,
µm
M5156M6200M8255M10310M12
365M14and M16420M20and M22530M24and M27
640M30750M36860M42970M481080M56
1190M64to M100
1300
N OTE 8—Bolts,screws,and studs in diameters smaller than M10are not normally hot-dip zinc-coated.
7.8.1Internal threads shall be subject to acceptance gaging using GO and HI thread plug gages having size limits as established in 7.8.Threads of nuts tapped after zinc coating (4.7)shall meet GO and HI thread plug gaging requirements as tapped.Threads of nuts tapped prior to zinc coating (4.8)shall meet HI thread plug gaging requirements prior to zinc coating and GO thread plug gaging requirements after zinc coating.7.9Nuts to be used on bolts,screws,or studs that are hot-dip or mechanically zinc-coated to requirements other than specified in 7.8shall be tapped oversize by a diametral allowance sufficient to permit assembly on the coated exter-nally threaded fastener.
N OTE 9—If the over-tapping diametral allowance is greater than the limit specified in 7.8,the purchaser is cautioned that the nut may not meet the proof load stress specified in Table 3.
7.10When specifically permitted by the purchaser,nuts for bolts,screws,or studs having an electrodeposited coating,such as cadmium,zinc,etc.,or having a chemically applied coating may be tapped oversize by a diametral allowance sufficient to permit assembly on the coated externally threaded fastener.
TABLE 4Nut Proof Load Values,kN
N OTE 1—Nuts of diameters and classes where no proof loads are given are non-standard.
N OTE 2—Proof loads are computed by multiplying proof load stress (Table 3)by thread stress area and dividing by 1000.
Nominal Diameter and Thread Pitch
Thread Stress Area,mm 2
Property Class of Nut
5
5(over-tapped)9
10
12
12(over-tapped)8S and 8S310S and 10S310S (over-tapped)M1.6x 0.35  1.  M2x
0.4  2.07    M2.5x 0.45  3.39    M3x 0.5  5.03    4.53  M3.5x 0.6  6.78    6.M4x 0.78.78  7.M5x 0.814.28.23  6.6013.014.816..M6x 120.111.79.3518.420.923..M8x 1.2536.621.617.234.438.142..M10x 1.558.034.227.354.560.367..M12x 1.7584.351.441.380.188.510080.190.610598.2M14x 211570.256.4109121137109124143134M16x 215795.876.9149165187149169195183M20x 2.5245154123225260294235263305285M22x 291326377353M24x 493571535M30x 3.5561353281516595673539603698654M36x 48175154097528669807848781020952M42x ..M56x .....M100x 6
6990
4400
3500
6430
...
8390
6710
...
...
...

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