1、Designation: A394 08 (Reapproved 2015)Standard Specification forSteel Transmission Tower Bolts, Zinc-Coated and Bare1This standard is issued under the fixed designation A394; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year
2、 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 t
3、he chemical and mechanicalrequirements of hexagon and square-head zinc-coated steelbolts and atmospheric corrosion-resistant bolts, in nominalthread diameters of12,58,34 ,78 and 1 in. for use in theconstruction of transmission towers, substations, and similarsteel structures. The various types of bo
4、lts covered in thisspecification are:1.1.1 Type 0Hot-dip zinc-coated bolts made of low ormedium carbon steel.1.1.2 Type 1Hot-dip zinc-coated bolts made of mediumcarbon steel, quenched and tempered.1.1.3 Type 2Withdrawn in 2005.1.1.4 Type 3Bare (uncoated), quenched and temperedbolts made of weatherin
5、g steel.1.2 Annex A1 of this specification covers hot-dip zinc-coated steel ladder bolts, step bolts, and support-equipmentbolts.1.3 Nuts and washers that are supplied under this specifica-tion that are hot-dip zinc coated shall be in accordance with4.4.1.4 Terms used in this specification are defin
6、ed in Termi-nology F1789.1.5 The values stated in inch-pound units are to be regardedas standard. No other units of measurement are included in thisstandard.1.6 The following safety hazards caveat pertains only to thetest methods portion, Section 11, of this specification. Thisstandard does not purp
7、ort 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 Documents2.1 ASTM Standards:2A563
8、Specification for Carbon and Alloy Steel NutsD3951 Practice for Commercial PackagingF436 Specification for Hardened Steel WashersF606/F606M Test Methods for Determining the MechanicalProperties of Externally and Internally ThreadedFasteners, Washers, Direct Tension Indicators, and RivetsF788/F788M S
9、pecification for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric SeriesF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1789 Terminology for F16 Mechanical FastenersF2329 Specification for Zinc Coating, Hot-Dip, Require-ments fo
10、r Application to Carbon and Alloy Steel Bolts,Screws, Washers, Nuts, and Special Threaded FastenersG101 Guide for Estimating the Atmospheric Corrosion Re-sistance of Low-Alloy Steels2.2 ASME Standards:3B1.1 Unified Screw ThreadsB18.2.1 Square and Hex Bolts and ScrewsB18.24 Part Identifying Number (P
11、IN) Code System Stan-dard for B18 Fastener Products3. Ordering Information3.1 Orders for products under this specification shall includethe following:3.1.1 Quantity (number of bolts and accessories).3.1.2 Name of products, including accessories such as A563nuts and F436 washers when desired.3.1.3 Di
12、mensions, including nominal bolt diameter andlength. For bolts other than transmission-tower bolts, completedimensions are required (see Annex A1).3.1.4 Type of bolt (for example, Type 0, 1, or 3).1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct respo
13、nsibility of Subcommittee F16.02 on Steel Bolts,Nuts, Rivets and Washers.Current edition approved June 15, 2015. Published June 2015. Originallyapproved in 1955. Last previous edition approved in 2008 as A394 081. DOI:10.1520/A0394-08R15.2For referenced ASTM standards, visit the ASTM website, www.as
14、tm.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, Two Park Ave., New York, N
15、Y 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 States13.1.4.1 When non-zinc-coated atmospheric corrosion-resistant steel is required, Type 3 b
16、olts shall be specified by thepurchaser.3.1.5 ASTM designation and year of issue. When year ofissue is not specified, bolts shall be furnished to the latest issue.3.1.6 Additional requirements, if any, are to be specified onthe purchase order:3.1.6.1 Shear-strength testing (see 6.2.1 and 6.2.2). Inc
17、ludetype of test required.3.1.6.2 Additional tests.3.1.6.3 Inspection (see 12.1 and 12.2).3.1.6.4 Certification (see 14.1).3.1.6.5 Test reports (see 14.1).3.1.6.6 Other finishes, specify other protective finish, ifrequired.NOTE 1Examples of ordering description:(1) 1000 square-head transmission-towe
18、r bolts,12 by 2 in. Type 1, hot-dipzinc coated, shear testing required, ASTM A394 XX, with hot-dipzinc-coated hex nuts, Grade DH, ASTM A563 XX,(2) 1000 transmission tower bolts,12 by 2 in. Type 0, hot-dip zinc coated,ASTM A394 XX, with hot-dip zinc-coated hex nuts, Grade A, ASTMA563 XX.(3) 1000 tran
19、smission tower bolts,12 by 2 in. Type 3, ASTM A394 XX,with hex nuts, Grade DH3 weathering steel, ASTM A563 XX and with2 circular washers, Type 3, ASTM F436 XX.3.1.7 For establishment of a part identifying system, seeASME B18.24.3.2 Recommended Nuts:3.2.1 Unless otherwise specified, all nuts on these
20、 bolts shallbe hex style and conform to the requirements of SpecificationA563 as follows.Bolt Type Nut Grade Finish0 A hot-dip zinc-coated1 DH hot-dip zinc-coated3 DH3 plain3.3 Recommended Washers:3.3.1 Suitable washers for use with Type 0 are hot-dipzinc-coated carbon-steel washers with dimensions
21、that are inaccordance with Specification F436. Suitable washers for usewith Type 1 bolts are hot-dip zinc-coated Type 1 hardened-steelwashers that are in accordance with Specification F436. Suit-able washers for use with Type 3 bolts are Type 3 hardened-steel washers that are in accordance with Spec
22、ification F436.4. Materials and Manufacture4.1 Steel for the manufacture of bolts shall be made by anyof the following processes: open-hearth, electric-furnace, orbasic-oxygen.4.2 Heat Treatment:4.2.1 Type 1 bolts produced from medium carbon steel shallbe quenched in a liquid medium from above the a
23、ustenizingtemperature. Type 1 bolts produced from medium carbon steelto which chromium, nickel, molybdenum, or boron wereintentionally added shall be quenched only in oil from abovethe austenitizing temperature.4.2.2 Type 3 bolts shall be quenched only in oil from abovethe austenitizing temperature.
24、4.2.3 Type 1 bolts, regardless of the steel used, and Type 3bolts shall be tempered by reheating to not less than 800F.4.2.4 Cold-headed Type 0 bolts shall be stress relief an-nealed before zinc coating to remove cold work effects suchthat the hardness measured anywhere on the surface or throughthe
25、cross-section shall meet the requirements in 6.1.4.3 Threads may be rolled or cut.4.4 Zinc Coatings, Hot Dip:4.4.1 Type 0 and Type 1 bolts shall be hot-dip zinc-coatedaccordance with the requirements of Specification F2329,except that the minimum average weight (thickness) of zinccoating shall be 1.
26、65 oz/ft2(0.0028 in.) and the minimumweight of zinc coating on any one item shall be 1.50 oz/ft2(0.0025 in.).4.4.2 Bolt threads shall not be cut, rolled, or otherwisefinished after zinc coating.4.4.3 Hot-dip zinc-coated nuts furnished under Specifica-tion A563 shall be tapped after zinc coating.4.4.
27、4 Hot-dip zinc-coated nuts and washers supplied for usewith bolts under this specification shall be zinc-coated inaccordance with 4.4.1.4.5 Protection of Uncoated SurfacesWhen hot-dip zinc-coated nuts are ordered, the cutting oil or some other suitablesubstance shall be left on the uncoated surface
28、to inhibit rustingduring shipment and storage. It is recommended that theadditional lubricant be clean and dry to the touch.4.6 Secondary Processing:4.6.1 If any processing which can affect the mechanicalproperties or performance of the bolts is performed after theinitial testing, the bolts shall be
29、 retested for all specifiedmechanical properties and performance requirements affectedby the reprocessing.4.6.2 When the secondary processing is heat treatment, thebolts shall be tested for all specified mechanical properties.Hot-dip zinc-coated bolts shall be tested for all specifiedmechanical prop
30、erties.5. Chemical Composition5.1 Type 0 and Type 1 bolts shall conform to the chemicalcomposition requirements specified in Table 1.5.2 Type 3 bolts shall conform to one of the chemicalcompositions specified in Table 2. The selection of the chemi-cal composition A, B, C, D, E, or F shall be at the
31、option of thebolt manufacturer. See Guide G101 for methods of estimatingthe atmospheric corrosion resistance of low alloy steels.6. Mechanical Properties6.1 Tension TestTypes 0, 1, and 3 bolts having a lengthequal to or more than 3 diameters shall be wedge tension testedas specified in 11.1 and shal
32、l conform to the tensile strengthrequirements in Table 3. Zinc-coated bolts shall be tested aftercoating. Bolts too short for full size testing or for other reasonsnot subject to tension tests, shall meet the following hardnessrequirements:Min MaxType 0Rockwell B 80 100Types 1 and 3Rockwell C 25 346
33、.2 Shear Strength:A394 08 (2015)26.2.1 When specified in the original inquiry and order, bolts,except as excluded in 6.2.2, shall be shear strength tested inaccordance with 11.2 and shall meet the requirements given inTable 4.6.2.2 Bolts with unthreaded body lengths shorter than twotimes the nominal
34、 bolt diameter, are subject to shear strengthtesting only upon agreement between the purchaser and sup-plier as to testing method and shear strength values.7. Dimensions7.1 Bolt threads, before zinc coating, shall be the unifiedcoarse thread series and Class 2A tolerance as defined in thelatest issu
35、e of ASME B1.1.TABLE 1 Chemical Requirements and Head MarkingsHead Marking Bolt TypeElement, %Carbon Manganese Phosphorus Sulfur Boron0 0.55 max . . . 0.048 max 0.058 max . . .1 0.28/0.55 0.60 min 0.048 max 0.058 max . . .3 . . . SeeTable 2 .TABLE 2 Chemical Requirements for Type 3 Heavy Hex Structu
36、ral BoltsAElementComposition, %Type 3 BoltsAABCDEFCarbon:Heat Analysis 0.330.40 0.380.48 0.150.25 0.150.25 0.200.25 0.200.25Product Analysis 0.310.42 0.360.50 0.140.26 0.140.26 0.180.27 0.190.26Manganese:Heat Analysis 0.901.20 0.700.90 0.801.35 0.401.20 0.601.00 0.901.20Product Analysis 0.861.24 0.6
37、70.93 0.761.39 0.361.24 0.561.04 0.861.24Phosphorus:Heat Analysis 0.035 max 0.060.125 0.035 max 0.035 max 0.035 max 0.035 maxProduct Analysis 0.040 max 0.061.25 0.040 max 0.040 max 0.040 max 0.040 maxSulfur:Heat Analysis 0.040 max 0.040 max 0.040 max 0.040 max 0.040 max 0.040 maxProduct Analysis 0.0
38、45 max 0.045 max 0.045 max 0.045 max 0.045 max 0.045 maxSilicon:Heat Analysis 0.150.35 0.300.50 0.150.35 0.250.50 0.150.35 0.150.35Product Analysis 0.130.37 0.250.55 0.130.37 0.200.55 0.130.37 0.130.37Copper:Heat Analysis 0.250.45 0.200.40 0.200.50 0.300.50 0.300.60 0.200.40Product Analysis 0.220.48
39、 0.170.43 0.170.53 0.270.53 0.270.63 0.170.43Nickel:Heat Analysis 0.250.45 0.500.80 0.250.50 0.500.80 0.300.60 0.200.40Product Analysis 0.220.48 0.470.83 0.220.53 0.470.83 0.270.63 0.170.43Chromium:Heat Analysis 0.450.65 0.500.75 0.300.50 0.501.00 0.600.90 0.450.65Product Analysis 0.420.68 0.470.83
40、0.270.53 0.451.05 0.550.95 0.420.68Vanadium:Heat AnalysisBB0.020 minBBBProduct Analysis 0.010 minMolybdenum:Heat AnalysisB0.06 maxB0.10 maxBBProduct AnalysisB0.07 maxB0.11 maxTitanium: . . . . . .Heat AnalysisBBB0.05 maxBBProduct Analysis 0.06 maxAA, B, C, D, E, and F are classes of material used fo
41、r Type 3 bolts. Selection of a class shall be at the option of the bolt manufacturer.BThese elements are not specified or required.TABLE 3 Tensile StrengthANominalSize,in.Minimum Tensile Load, lbfType 0BTypes 1 and 3C12 10 500 17 05058 16 700 27 10034 24 700 40 10078 34 200 55 4501 44 850 72 700ATen
42、sile strength based on the thread stress area, As, is calculated as follows:As= 0.7854 D (0.9743/N)2where:D = nominal diameter, andN = threads per inch.BBased on 74 000 psi unit tensile strength.CBased on 120 000 psi unit tensile strength.A394 08 (2015)37.2 Unless otherwise specified, hex bolts shal
43、l be furnished.End bolts need not be chamfered or pointed. Bolts shall befull-size body in conformance with the latest issue of ASMEB18.2.1, except as specified in 7.2.1 or 7.2.2.7.2.1 Full-body length listed in Table 5 of this specificationshall be the basis of manufacture and inspection.7.2.2 On r
44、olled thread bolts, the distance from the top of theextrusion angle to be the first fully formed thread shall notexceed 3.5 thread pitches in length.7.3 Threads:7.3.1 UncoatedThere shall be the Unified Coarse ThreadSeries as specified in ASME B1.1, and shall have Class 2Atolerances.7.3.2 CoatedUnles
45、s otherwise specified, zinc-coated boltsto be used with zinc-coated nuts or tapped holes that are tappedoversize, in accordance with Specification A563, shall haveClass 2A threads before hot-dip zinc-coating. After zinc-coating, the maximum limits of pitch and major diameter shallnot exceed the Clas
46、s 2A limit by more than the followingamounts:Nominal BoltDiameter, in.Oversize Limit, in.AHot-Dip Zinc12 0.01858 ,34 0.02078 0.0221 0.024AHot-dip zinc-coated nuts are tapped oversize after coating.7.3.3 The gaging limit for bolts shall be verified duringmanufacture. In case of dispute, a calibrated
47、thread ring gage ofthe same size as the oversize limit in 7.3.2 (Class X tolerance,gage tolerance plus) shall be used to verify compliance. Thegage shall assemble with hand effort following application oflight machine oil to prevent galling and damage to the gage.These inspections, when performed to
48、 resolve controversy,shall be conducted at the frequency specified in the qualityassurance provisions of ASME B18.2.1.8. Workmanship8.1 Surface discontinuity limits of Types 1 and 3 shall be inaccordance with Specification F788/F788M.9. Sampling9.1 Testing Responsibility:9.1.1 Each lot shall be test
49、ed by the manufacturer prior toshipment in accordance with the lot identification controlquality assurance plan in 9.2 9.4.9.1.2 When bolts are furnished by a source other than themanufacturer, the responsibly party as defined in Section 15shall be responsible for assuring all tests have been performedand the bolts comply with the requirements of this specification(see 4.6).9.2 Purpose of Lot InspectionThe purpose of a lot inspec-tion program is to ensure th
