1、Designation: F3043 14Standard Specification for“Twist Off” Type Tension Control Structural Bolt/Nut/WasherAssemblies, Alloy Steel, Heat Treated, 200 ksi MinimumTensile Strength1,2This standard is issued under the fixed designation F3043; the number immediately following the designation indicates the
2、 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.1. Scope1.1 This specification covers one style of heat treated
3、, alloysteel, tension control bolt-nut-washer assemblies, also referredto as “sets,” having a tensile strength of 200 to 215 ksi. Theseassemblies are capable of developing a minimum predeter-mined tension when installed by applying torque to the nut,while at the same time applying a counter torque t
4、o separate thespline end from the body of the bolt using an appropriate splinedrive installation tool.1.2 An assembly consists of a tension control bolt withspline end, nut and washer covered by this specification.1.3 The assemblies are available with round heads describedin Section 10, in sizes 1 i
5、n. to 114 in. inclusive.1.4 The fastener assemblies are intended for use in struc-tural connections in the following environmental conditions:1.4.1 Interiors, normally dry, including interiors wherestructural steel is embedded in concrete, encased in masonry orprotected by membrane or noncorrosive c
6、ontact type fireproof-ing.1.4.2 Interiors and exteriors, normally dry, under roof,where the installed assemblies are soundly protected by ashop-applied or field-applied coating to the structural steelsystem.1.5 The fastener assemblies are not intended for use instructural connections in the followin
7、g environments, with orwithout protection by a shop-applied or field-applied coating tothe structural steel system:1.5.1 Exteriors not under roof.1.5.2 Chemical environments in which strong concentra-tions of highly corrosive gases, fumes, or chemicals, either insolution or as concentrated liquids o
8、r solids, contact thefasteners or their protective coating.1.5.3 Heavy industrial environments severe enough to beclassified as a chemical environment as described in 1.5.2.1.5.4 Condensation and high humidity environments main-taining almost continuous condensation, including submergedin water and
9、soil.1.5.5 Cathodically protected environments, in which currentis applied to the structural steel system by the sacrificial anodemethod or the DC power method.1.6 UnitsThe values stated in inch-pound units are to beregarded as standard. No other units of measurement areincluded in this standard.1.7
10、 The following precautionary statement pertains only tothe test method portions, Section 15, Section 16 and Annex A2of this Specification: This standard does not purport to addressall of the safety concerns, if any, associated with its use. It isthe responsibility of the user of this standard to est
11、ablishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:3A751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsE709 Guide for Magnetic Particle TestingE1444 Practice
12、for Magnetic Particle TestingF606 Test Methods for Determining the Mechanical Proper-ties of Externally and Internally Threaded Fasteners,Washers, Direct Tension Indicators, and RivetsF788/F788M Specification for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric SeriesF812/F812M Sp
13、ecification for Surface Discontinuities ofNuts, Inch and Metric Series1This 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 Oct. 1, 2014. Published Decem
14、ber 2014. DOI:10.1520/F3043-14.2The “Twist Off“ Type Tension Control Structural Bolt/Nut/Washer Assemblies,Alloy Steel, Heat Treated, 200 ksi Minimum Tensile Strength of Grade 2 is coveredby US patent number 7 070 664, July 4, 2006. Interested parties are invited to submitinformation regarding the i
15、dentification of an alternative(s) to this patented item tothe ASTM International Headquarters. Your comments will receive careful consid-eration at a meeting of the responsible technical committee, which you may attend.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact
16、ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1F1470 Practice for Fastener
17、 Sampling for Specified Me-chanical Properties and Performance InspectionF1789 Terminology for F16 Mechanical FastenersF2328 Test Method for Determining Decarburization andCarburization in Hardened and Tempered Threaded SteelBolts, Screws, Studs, and Nuts2.2 ASME Standards:4B1.3 Screw Thread Gaging
18、Systems for Acceptability: Inchand Metric Screw Threads (UN, UNR, UNJ, M, and MJ)B1.15 Unified Inch Screw Threads (UNJ Thread Form)B18.2.6 Fasteners for Use in Structural Applications3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 The definition of terms used in this specifica
19、tion shallbe as specified in Terminology F1789, unless otherwise definedherein.3.1.2 component lot, ncomponent lot, for the purpose ofassigning an identification number and from which testsamples shall be selected, shall consist of all tension controlbolts, all nuts or all washers processed essentia
20、lly togetherthrough all operations to the shipping container, of which eachcomponent has the following common characteristics: heatnumber (mill heat); nominal dimensions (size), grade, and heattreatment lot.3.1.3 manufacturer, nentity that assembles, lubricates,tests, and certifies compliance with t
21、his specification.4. Ordering Information4.1 Orders for assemblies shall include the items of infor-mation below. Optional items not on the purchase order shallbe considered as not being required (see Note 1):4.1.1 Quantity of assemblies,4.1.2 Size, including nominal tension control bolt diameter,bo
22、lt length (without the spline end), and thread pitch,4.1.3 Grade, that is, Grade 1 or Grade 2,4.1.4 Name of product, that is, twist off type tension controlbolt/nut/washer assemblies2,4.1.5 ASTM designation and year of publication, and4.1.6 Special requirements, if required.NOTE 1A typical order des
23、cription follows: 1000 assemblies, 114diameter by 4 in. long with 7 threads per in., Grade 2, Tension ControlBolt/Nut/Washer Assemblies, Round Heads, ASTM F3043.5. Materials and Manufacture5.1 Tension Control Bolt/Nut/Washer Assemblies:5.1.1 The assemblies shall be of the round head style.5.1.2 The
24、assemblies shall consist of one tension controlbolt, with one nut and one washer assembled on the bolt andthe nut threaded on the bolt a minimum of one turn.5.1.3 All nuts shall be heavy hex.5.1.4 All washers used in the assembly shall be circular andthrough hardened.5.1.5 Protective CoatingsThe bol
25、ts, nuts and washersshall not be coated by hot dip zinc coating, mechanicaldeposition, electroplating, dip-spin, dip-drain, or spray meth-ods with zinc or other metallic coatings.NOTE 2Protective coatings may be shop-applied or field-applied toinstalled assemblies.5.1.6 Lubrication:5.1.6.1 The assem
26、blies shall be lubricated by the manufac-turer to meet the Assembly Lot Tension requirements inSection 9.5.1.6.2 Lubrication other than that applied by the manufac-turer shall not be permitted, as the type and amount oflubrication is critical to meeting the minimum clamping forcesspecified.5.1.7 Sec
27、ondary ProcessingSecondary processing shallnot be permitted to an assembly lot.5.2 Tension Control Bolts:5.2.1 Heat Treatment:5.2.1.1 If phosphate coating has been applied to the rawmaterial, the residual phosphate shall be removed prior to heattreatment, and a record of the application of this proc
28、essingstep shall be maintained by the processor.5.2.1.2 Tension control bolts shall be heat treated byquenching in oil from the austenitizing temperature and thentempering by reheating to a temperature not less than 1000F.5.2.2 ThreadThe threads of tension control bolts shall berolled.5.3 Nuts:5.3.1
29、 Nuts shall be made by hot forming.5.3.2 Nuts shall be heat treated by quenching in a liquidmedium from a temperature above the transformation tempera-ture and tempering at a temperature of at least 850F.5.3.3 Threads shall be formed by tapping.5.4 Washers:5.4.1 Washers shall be through hardened.6.
30、Chemical Composition6.1 Tension Control Bolts:6.1.1 Steel for tension control bolts shall be made by thebasic oxygen process.6.1.2 Bolts shall be alloy steel conforming to the chemicalcomposition in Table 1.4Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarte
31、rs, Two Park Ave., New York, NY 10016-5990, http:/www.asme.org.TABLE 1 Chemical Requirements for Tension Control BoltsAElementComposition, %Heat Analysis, % Product Analysis, %min max min maxCarbon 0.38 0.42 0.36 0.44Manganese 0.40 0.60 0.37 0.63Phosphorus . . . 0.01 . . . 0.015Sulfur . . . 0.01 . .
32、 . 0.015Silicon . . . 0.10 . . . 0.12Chromium 1.20 1.40 1.15 1.45Molybdenum 0.60 0.80 0.57 0.83Vanadium 0.30 0.40 0.27 0.43AAluminum, cobalt, niobium / columbium, nickel, titanium, tungsten, zirconium, orany other alloying elements may be added to obtain the desired alloying effect.F3043 1426.1.3 Pr
33、oduct analysis may be made by the purchaser onfinished bolts representing each lot. The chemical compositionshall conform to the requirements in Table 1, ProductAnalysis.6.1.4 Heats of steel to which bismuth, selenium, tellurium,lead or boron has been intentionally added shall not bepermitted.6.1.5
34、Compliance with 6.1.4 shall be based on certificationthat heats of steel having any of the listed elements intention-ally added were not used to produce the bolts.6.1.6 Chemical analysis shall be performed in accordancewith Test Methods, Practices, and Terminology A751.6.2 Nuts:6.2.1 Steel for nuts
35、shall be made by the basic oxygen orelectric-furnace process.6.2.2 Nuts shall conform to the chemical composition inTable 2.6.2.3 Product analysis may be made by the purchaser onfinished nuts representing each lot. The chemical compositionshall conform to the requirements in Table 2, ProductAnalysis
36、.6.2.4 Chemical analysis shall be performed in accordancewith Test Methods, Practices, and Terminology A751.6.3 Washers:6.3.1 Steel used in the manufacture of washers shall beproduced by the basic-oxygen or electric-furnace process.6.3.2 Washers shall conform to the chemical compositionspecified in
37、Table 3.6.3.3 Product analysis may be made by the purchaser onfinished washers representing each lot. The chemical compo-sition shall conform to the requirements in Table 3, ProductAnalysis.6.3.4 Chemical analysis shall be performed in accordancewith Test Methods, Practices, and Terminology A751.7.
38、Mechanical Property Requirements for TensionControl Bolts, Nuts and Washers7.1 Tension Control Bolts:7.1.1 HardnessBolts shall conform to the hardness speci-fied in Table 4.7.1.2 Tensile Properties:7.1.2.1 Bolts shall be wedge tested full size and shallconform to the minimum and maximum wedge tensil
39、e load,and proof load or alternative proof load specified in Table 5.The load achieved during proof load testing shall be equal to orgreater than the specified proof load.7.1.2.2 When the length of the bolt makes full size testingimpractical, machined specimens shall be tested and shallconform to th
40、e requirements specified in Table 6. When boltsare tested by both full size and machined specimen methods,the full size test shall take precedence.7.1.2.3 For bolts on which both hardness and tension testsare performed, acceptance based on tensile requirements shalltake precedence in the event of lo
41、w hardness readings.7.1.2.4 Sample bolts shall be used to verify that the alloysteel material and heat treatment provides resistance to Envi-ronmental Hydrogen Embrittlement (EHE), in accordance withthe requirements of Annex A2.7.2 Nuts:7.2.1 Nuts shall conform to the surface hardness specified inTa
42、ble 7.7.2.2 Nuts shall withstand the proof load stress specified inTable 8.TABLE 2 Chemical Requirements for NutsElementComposition, %Heat Analysis, % Product Analysis, %min max min maxCarbon 0.30 0.48 0.28 0.50Manganese 0.60 0.90 0.57 0.93Silicon 0.15 0.35 0.13 0.37Phosphorus . . . 0.050 . . . 0.05
43、5Sulfur . . . 0.050 . . . 0.055TABLE 3 Chemical Requirements for WashersElementComposition, %Heat Analysis, % Product Analysis, %min max min maxCarbon 0.42 0.48 0.40 0.50Manganese 0.60 0.90 0.57 0.93Silicon 0.15 0.35 0.13 0.37Phosphorus . . . 0.030 . . . 0.035Sulfur . . . 0.030 . . . 0.035TABLE 4 Ha
44、rdness Requirements for Tension Control BoltsBolt Size, in. Bolt Length, in.Rockwell Cmin max1to114, incl all 38 45TABLE 5 Tensile Requirements for Full Size Tension ControlBoltsBolt Size,Threads per in.Stress Area,in.2 A,BTensile Load, lbfCmin maxColumn 1 Column 2 Column 3 Column 4Grade 11 in. - 8
45、0.615 123 100 132 300118 in. - 7 0.776 155 200 166 800114 in. - 7 0.983 196 700 211 400Grade 21 in. - 8 0.640 128 000 137 700118 in. - 7 0.808 161 600 173 600114 in. - 7 1.019 203 800 219 100AThe stress area for Grade 1 is calculated as:As= 0.7854 0.5 (d3 max+d2 max)2BThe stress area for Grade 2 is
46、calculated in accordance with Annex A1.CLoads tabulated are based on the following:Bolt Size, in. Column 3 Column 41to114 200 000 psi 215 000 psiTABLE 6 Tensile Strength Requirements for SpecimensMachined from BoltsNominalBoltDiameter,in.Tensile Strength, ksiYieldStrength(0.2 %offset),min, ksiElonga
47、tionin 2 in. or50 mm,min, %Reductionof Area,min, %min max1to114,incl200 215 180 14 40F3043 1437.3 Washers:7.3.1 Washers shall conform to the core hardness specifiedin Table 9.8. Assembly Lot Tension Test8.1 PurposeThe assembly lot tension test shall be per-formed on fastener assemblies to determine
48、the ability of theassembly to provide the required minimum tension.8.2 RequirementFull size completed assemblies tested inaccordance with 14.4 shall develop a bolt tension when thespline end is separated from the bolt conforming to therequirements in Table 10, Column 1.9. Carburization/Decarburizati
49、on of Bolts9.1 This test is intended to evaluate the presence or absenceof carburization and decarburization as determined by thedifference in microhardness near the surface and core.9.2 Requirements:9.2.1 CarburizationThe assemblies shall show no evi-dence of a carburized surface when evaluated in accordancewith 14.1.4.9.2.2 DecarburizationHardness value differences shallnot exceed the requirements set forth for decarburization inTest Method F2328 for class34 H materials when evaluated inaccordance with 14.1.4.10. Dimensions of Tension Control Bolts, Nut
