1、Designation: F3043 141Standard 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 th
2、e 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.1NOTESection 1.7 and the title of Annex A1 were editorially co
3、rrected in February 2015.1. Scope1.1 This specification covers one style of heat treated, 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 in
4、stalled by applying torque to the nut,while at the same time applying a counter torque to 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 specificatio
5、n.1.3 The assemblies are available with round heads describedin Section 10, in sizes 1 in. 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 ste
6、el is embedded in concrete, encased in masonry orprotected by membrane or noncorrosive contact 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 T
7、he fastener assemblies are not intended for use instructural connections in the following 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 hig
8、hly corrosive gases, fumes, or chemicals, either insolution or as concentrated liquids or 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 en
9、vironments main-taining almost continuous condensation, including submergedin water and 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 t
10、o beregarded as standard. No other units of measurement areincluded in this standard.1.7 The following precautionary statement pertains only tothe test method portions, Section 13, Section 14 and Annex A2of this Specification: This standard does not purport to addressall of the safety concerns, if a
11、ny, associated with its use. It isthe responsibility of the user of this standard to establishappropriate 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 Che
12、mi-cal Analysis of Steel ProductsE709 Guide for Magnetic Particle TestingE1444 Practice 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
13、 Surface Discontinuities of1This 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 December 2014. DOI:10.1520/F3043-14E01.2The “Twi
14、st 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 identification of an alternative(s) to th
15、is 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 ASTM Customer Service at serviceastm.org
16、. 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 States1Bolts, Screws, and Studs, Inch and Metric SeriesF812/F812M Specific
17、ation for Surface Discontinuities ofNuts, Inch and Metric SeriesF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1789 Terminology for F16 Mechanical FastenersF2328 Test Method for Determining Decarburization andCarburization in Hardened and Tempere
18、d Threaded SteelBolts, Screws, Studs, and Nuts2.2 ASME Standards:4B1.3 Screw Thread Gaging 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 Definiti
19、ons of Terms Specific to This Standard:3.1.1 The definition of terms used in this specification 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 sele
20、cted, shall consist of all tension controlbolts, all nuts or all washers processed essentially 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.
21、1.3 manufacturer, nentity that assembles, lubricates,tests, and certifies compliance with this 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):
22、4.1.1 Quantity of assemblies,4.1.2 Size, including nominal tension control bolt diameter,bolt 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 an
23、d year of publication, and4.1.6 Special requirements, if required.NOTE 1A typical order description 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
24、Bolt/Nut/Washer Assemblies:5.1.1 The assemblies shall be of the round head style.5.1.2 The 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
25、used in the assembly shall be circular andthrough hardened.5.1.5 Protective CoatingsThe bolts, 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
26、be shop-applied or field-applied toinstalled assemblies.5.1.6 Lubrication:5.1.6.1 The assemblies 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
27、 amount oflubrication is critical to meeting the minimum clamping forcesspecified.5.1.7 Secondary 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 phos
28、phate shall be removed prior to heattreatment, and a record of the application of this processingstep 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 les
29、s than 1000F.5.2.2 ThreadThe threads of tension control bolts shall berolled.5.3 Nuts:5.3.1 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
30、 Threads shall be formed by tapping.5.4 Washers:5.4.1 Washers shall be through hardened.6. 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 1.6.
31、1.3 Product 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.
32、6.1.5 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:4Available from
33、 American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Two Park Ave., New York, NY 10016-5990, http:/www.asme.org.F3043 14126.2.1 Steel for nuts shall be made by the basic oxygen orelectric-furnace process.6.2.2 Nuts shall conform to the chemical composition inTable 2.6.2.
34、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.6.2.4 Chemical analysis shall be performed in accordancewith Test Methods, Practices, and Terminology A751.6.3 Washers:6.3.1 St
35、eel 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 Table 3.6.3.3 Product analysis may be made by the purchaser onfinished washers representing each lot. The chemical compo-sition
36、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. Mechanical Property Requirements for TensionControl Bolts, Nuts and Washers7.1 Tension Control Bolts:7.1.1 HardnessBolts shall c
37、onform 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 tensile load,and proof load or alternative proof load specified in Table 5.The load achieved during proof load testing shall be equal
38、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 the requirements specified in Table 6. When boltsare tested by both full size and machined specimen methods,the full size test sha
39、ll 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 low hardness readings.7.1.2.4 Sample bolts shall be used to verify that the alloysteel material and heat treatment provides resist
40、ance 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 inTable 7.TABLE 1 Chemical Requirements for Tension Control BoltsAElementComposition, %Heat Analysis, % Product Analysis, %min max m
41、in maxCarbon 0.38 0.42 0.36 0.44Manganese 0.40 0.60 0.37 0.63Phosphorus . . . 0.01 . . . 0.015Sulfur . . . 0.01 . . . 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, tung
42、sten, zirconium, orany other alloying elements may be added to obtain the desired alloying effect.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
43、 . . . 0.050 . . . 0.055Sulfur . . . 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 . . . 0.03
44、0 . . . 0.035TABLE 4 Hardness 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 Co
45、lumn 4Grade 11 in. - 8 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 stre
46、ss area for Grade 2 is 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
47、%offset),min, ksiElongationin 2 in. or50 mm,min, %Reductionof Area,min, %min max1to114,incl200 215 180 14 40F3043 14137.2.2 Nuts shall withstand the proof load stress specified inTable 8.7.3 Washers:7.3.1 Washers shall conform to the core hardness specifiedin Table 9.8. Assembly Lot Tension Test8.1
48、PurposeThe assembly lot tension test shall be per-formed on fastener assemblies to determine 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 fro
49、m the bolt conforming to therequirements in Table 10, Column 1.9. Carburization/Decarburization 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 class3
