1、Designation: A325 10American AssociationState Highway andTransportation OfficialsStandard AASHTO No.: M 164Standard Specification forStructural Bolts, Steel, Heat Treated, 120/105 ksi MinimumTensile Strength1This standard is issued under the fixed designation A325; the number immediately following t
2、he 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
3、 use by agencies of the Department of Defense.1. Scope*1.1 This specification2covers two types of quenched andtempered steel heavy hex structural bolts having a minimumtensile strength of 120 ksi for sizes 1.0 in. and less and 105 ksifor sizes over 1.0 to 112 in., inclusive.1.2 The bolts are intende
4、d for use in structural connections.These connections are covered under the requirements of theSpecification for Structural Joints Using ASTM A325 or A490Bolts, approved by the Research Council on Structural Con-nections, endorsed by theAmerican Institute of Steel Construc-tion and by the Industrial
5、 Fastener Institute.31.3 The bolts are furnished in sizes12 to 112 in., inclusive.They are designated by type, denoting chemical composition asfollows:Type DescriptionType 1 Medium carbon, carbon boron, or medium carbon alloy steel.Type 2 Withdrawn in November 1991.Type 3 Weathering steel.NOTE 1Bolt
6、s for general applications, including anchor bolts, arecovered by Specification A449. Also refer to Specification A449 forquenched and tempered steel bolts and studs with diameters greater than112 in. but with similar mechanical properties.1.4 The values stated in inch-pound units are to be regarded
7、as standard. No other units of measurement are included in thisstandard.NOTE 2Acomplete metric companion to SpecificationA325 has beendeveloped, Specification A325M; therefore, no metric equivalents arepresented in this specification.1.5 This specification is applicable to heavy hex structuralbolts
8、only. For bolts of other configurations and thread lengthswith similar mechanical properties, see Specification A449.1.6 Terms used in this specification are defined in Termi-nology F1789.1.7 The following safety hazard caveat pertains only to thetest methods portion, Section 10, of this specificati
9、on: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Docu
10、ments2.1 ASTM Standards:4A194/A194M Specification for Carbon and Alloy SteelNuts for Bolts for High Pressure or High TemperatureService, or BothA325M Specification for Structural Bolts, Steel, HeatTreated 830 MPa Minimum Tensile Strength (Metric)A449 Specification for Hex Cap Screws, Bolts and Studs
11、,Steel, Heat Treated, 120/105/90 ksi Minimum TensileStrength, General UseA490 Specification for Structural Bolts, Alloy Steel, HeatTreated, 150 ksi Minimum Tensile StrengthA563 Specification for Carbon and Alloy Steel NutsA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel
12、ProductsB695 Specification for Coatings of Zinc Mechanically De-posited on Iron and SteelD3951 Practice for Commercial PackagingF436 Specification for Hardened Steel WashersF606 Test Methods for Determining the Mechanical Prop-erties of Externally and Internally Threaded Fasteners,Washers, Direct Te
13、nsion Indicators, and Rivets1This 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 May 1, 2010. Published June 2010. Originallyapproved in 1964. Last prev
14、ious edition approved in 2009 as A325 09a1. DOI:10.1520/A0325-10.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-325 in Section II of that Code.3Published by American Institute of Steel Construction (AISC), One E. WackerDr., Suite 700, Chicago, IL 60601-2001, htt
15、p:/www.aisc.org.4For 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.1*A Summary of Changes section appears at the
16、 end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.F788/F788M Specification for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric SeriesF959 Specification for Compressible-Washer-Type DirectTension
17、 Indicators for Use with Structural FastenersF1136 Specification for Zinc/Aluminum Corrosion Protec-tive Coatings for FastenersF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1789 Terminology for F16 Mechanical FastenersF2329 Specification for Zin
18、c Coating, Hot-Dip, Require-ments for Application to Carbon and Alloy Steel Bolts,Screws, Washers, Nuts, and Special Threaded FastenersG101 Guide for Estimating the Atmospheric CorrosionResistance of Low-Alloy Steels2.2 ASME Standards:5B 1.1 Unified Screw ThreadsB 18.2.6 Fasteners for Use in Structu
19、ral ApplicationsB 18.24 Part Identification Number (PIN) Code SystemStandard for B18 Fastener Products3. Ordering Information3.1 Orders for heavy hex structural bolts under this speci-fication shall include the following:3.1.1 Quantity (number of pieces of bolts and accessories).3.1.2 Size, includin
20、g nominal bolt diameter, thread pitch,and bolt length.3.1.3 Name of product, heavy hex structural bolts.3.1.4 When bolts threaded full length are required, Supple-mentary Requirement S1 shall be specified.3.1.5 Type of bolt: Type 1 or 3. When type is not specified,either Type 1 or Type 3 shall be fu
21、rnished at the suppliersoption.3.1.6 ASTM designation and year of issue.3.1.7 Other components such as nuts, washers, and com-pressible washer-type direct-tension indicators, if required.3.1.7.1 When such other components are specified to befurnished, also state “Nuts, washers, and direct tension in
22、dica-tors, or combination thereof, shall be furnished by lot number.”3.1.8 Zinc CoatingSpecify the zinc coating process re-quired, for example, hot dip, mechanically deposited, Zinc/Aluminum Corrosion Protective Coating or no preference (see4.3).3.1.9 Other FinishesSpecify other protective finish, i
23、frequired.3.1.10 Test reports, if required (see Section 13).3.1.11 Supplementary or special requirements, if required.3.1.12 For establishment of a part identifying system, seeASME B 18.24.NOTE 3A typical ordering description follows: 1000 pieces 118-7UNC in. dia 3 4 in. long heavy hex structural bo
24、lt, Type 1 ASTMA32502, each with one hardened washer, ASTM F436 Type 1, and oneheavy hex nut, ASTM A563 Grade DH. Each component hot-dipzinc-coated. Nuts lubricated.3.2 Recommended Nuts:3.2.1 Nuts conforming to the requirements of SpecificationA563 are the recommended nuts for use with Specification
25、A325 heavy hex structural bolts. The nuts shall be of the classand have a surface finish for each type of bolt as follows:Bolt Type and Finish Nut Class and Finish1, plain (noncoated) A563-C, C3, D, DH, DH3,plain1, zinc coated A563-DH, zinc coated1, coated in accordance withSpecification F1136, Grad
26、e3A563DH coated in accor-dance with SpecificationF1136, Grade 53, plain A563-C3, DH3, plain3.2.2 Alternatively, nuts conforming to Specification A194/A194M Gr. 2H are considered a suitable substitute for use withSpecification A325 Type 1 heavy hex structural bolts.3.2.3 When Specification A194/A194M
27、 Gr. 2H zinc-coatednuts are supplied, the zinc coating, overtapping, lubrication,and rotational capacity testing shall be in accordance withSpecification A563.3.3 Recommended Washers:3.3.1 Washers conforming to Specification F436 are therecommended washers for use with Specification A325 heavyhex st
28、ructural bolts. The washers shall have a surface finish foreach type of bolt as follows:Bolt Type and Finish Washer Finish1, plain (uncoated) plain (uncoated)1, zinc coated zinc coated1, coated in accordance withSpecification F1136, Grade 3coated in accordance with Speci-fication F1136, Grade 33, pl
29、ain weathering steel, plain3.4 Other Accessories:3.4.1 When compressible washer type direct tension indica-tors are specified to be used with these bolts, they shallconform to Specification F959, Type 325.4. Materials and Manufacture4.1 Heat Treatment:4.1.1 Type 1 bolts produced from medium carbon s
30、teel shallbe quenched in a liquid medium from the austenitizingtemperature. Type 1 bolts produced from medium carbon steelto which chromium, nickel, molybdenum, or boron wereintentionally added shall be quenched only in oil from theaustenitizing temperature.4.1.2 Type 3 bolts shall be quenched only
31、in oil from theaustenitizing temperature.4.1.3 Type 1 bolts, regardless of the steel used, and Type 3bolts shall be tempered by reheating to not less than 800F.4.2 ThreadingThreads shall be cut or rolled.4.3 Zinc Coatings, Hot-Dip and Mechanically Deposited,Zinc/Aluminum Corrosion Protective Coating
32、:4.3.1 When zinc-coated fasteners are required, the pur-chaser shall specify the zinc coating process, for example, hotdip, mechanically deposited, Zinc/Aluminum Corrosion Pro-tective Coating, or no preference.5Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headqua
33、rters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.A325 1024.3.2 When hot-dip is specified, the fasteners shall bezinc-coated by the hot-dip process and the coating shallconform to the coating weight/thickness and performancerequirements of Specification F2329.4.3.3 When mechanicall
34、y deposited is specified, the fasten-ers shall be zinc-coated by the mechanical deposition processand the coating shall conform to the coating weight/thicknessand performance requirements of Class 55 of SpecificationB695.4.3.4 When Zinc/Aluminum Corrosion Protective Coatingis specified, the coating
35、shall conform to the coating weight/thickness and performance requirements of Grade 3 of Speci-fication F1136.4.3.5 When no preference is specified, the supplier shallfurnish either a hot-dip zinc coating in accordance withSpecification F2329, a mechanically deposited zinc coating inaccordance with
36、Specification B695, Class 55, or a Zinc/Aluminum Corrosion Protective Coating in accordance withSpecification F1136, Grade 3. Threaded components (bolts andnuts) shall be coated by the same zinc-coating process and thesuppliers option is limited to one process per item with nomixed processes in a lo
37、t.4.4 LubricationWhen zinc-coated nuts are ordered withthe bolts, the nuts shall be lubricated in accordance withSpecification A563, Supplementary Requirement S1, to mini-mize galling.4.5 Secondary Processing:4.5.1 If any processing, which can affect the mechanicalproperties or performance of the bo
38、lts, is performed after theinitial testing, the bolts shall be retested for all specifiedmechanical properties and performance requirements affectedby the reprocessing.4.5.2 When the secondary process is heat treatment, thebolts shall be tested for all specified mechanical properties. Hotdip zinc-co
39、ated bolts shall be tested for all specified mechani-cal properties and rotational capacity. If zinc-coated nuts arerelubricated after the initial rotational capacity tests, theassemblies shall be retested for rotational capacity.5. Chemical Composition5.1 Type 1 bolts shall be plain carbon steel, c
40、arbon boronsteel, alloy steel or alloy boron steel at the manufacturersoption, conforming to the chemical composition specified inTable 1.5.2 Type 3 bolts shall be weathering steel and shall conformto one of the chemical compositions specified in Table 2. Theselection of the chemical composition,A,
41、B, C, D, E, or F, shallbe at the option of the bolt manufacturer. See Guide G101 formethods of estimating the atmospheric corrosion resistance oflow alloy steels.5.3 Product analyses made on finished bolts representingeach lot shall conform to the product analysis requirementsspecified in Tables 1 a
42、nd 2, as applicable.5.4 Heats of steel to which bismuth, selenium, tellurium, orlead has been intentionally added shall not be permitted forbolts.5.5 Compliance with 5.4 shall be based on certification thatheats of steel having any of the listed elements intentionallyadded were not used to produce t
43、he bolts.5.6 Chemical analyses shall be performed in accordancewith Test Methods, Practices, and Terminology A751.6. Mechanical Properties6.1 HardnessThe bolts shall conform to the hardnessspecified in Table 3.6.2 Tensile Properties:6.2.1 Except as permitted in 6.2.1.1 for long bolts and6.2.1.2 for
44、short bolts, sizes 1.00 in. and smaller having anominal length of 214 D and longer, and sizes larger than 1.00in. having a nominal length of 3D and longer, shall be wedgetested full size and shall conform to the minimum wedgetensile load and proof load or alternative proof load specified inTable 4.
45、The load achieved during proof load testing shall beequal to or greater than the specified proof load.TABLE 1 Chemical Requirements for Type 1 BoltsElementCarbon SteelHeatAnalysisProductAnalysisCarbon 0.300.52 0.280.55Manganese, min 0.60 0.57Phosphorus, max 0.040 0.048Sulfur, max 0.050 0.058Silicon
46、0.150.30 0.130.32ElementCarbon Boron SteelHeatAnalysisProductAnalysisCarbon 0.300.52 0.280.55Manganese, min 0.60 0.57Phosphorus, max 0.040 0.048Sulfur, max 0.050 0.058Silicon 0.100.30 0.080.32Boron 0.00050.003 0.00050.003ElementAlloy SteelHeatAnalysisProductAnalysisCarbon 0.300.52 0.280.55Manganese,
47、 min 0.60 0.57Phosphorus, max 0.035 0.040Sulfur, max 0.040 0.045Silicon 0.150.35 0.130.37Alloying ElementsAAAlloy Boron SteelHeatAnalysisProductAnalysisCarbon 0.300.52 0.280.55Manganese, min 0.60 0.57Phosphorus, max 0.035 0.040Sulfur, max 0.040 0.045Silicon 0.150.35 0.130.37Boron 0.00050.003 0.00050
48、.003Alloying ElementsAAASteel, as defined by the American Iron and Steel Institute, shall be consideredto be alloy when the maximum of the range given for the content of alloyingelements exceeds one or more of the following limits: Manganese, 1.65 %; silicon,0.60 %; copper, 0.60 % or in which a defi
49、nite range or a definite minimum quantityof any of the following elements is specified or required within the limits of therecognized field of constructional alloy steels: aluminum, chromium up to 3.99 %,cobalt, columbium, molybdenum, nickel, titanium, tungsten, vanadium, zirconium,or any other alloying elements added to obtain a desired alloying effect.A325 1036.2.1.1 When the length of the bolt makes full-size testingimpractical, machined specimens shall be tested and shallconform to the requirements specified in Table 5. When boltsare
