1、Designation: F606M 12Standard Test Methods forDetermining the Mechanical Properties of Externally andInternally Threaded Fasteners, Washers, and Rivets(Metric)1This standard is issued under the fixed designation F606M; the number immediately following the designation indicates the year oforiginal ad
2、option 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 use by agencies of the Department of Defense.1
3、. Scope*1.1 These test methods cover establishment of proceduresfor conducting tests to determine the mechanical properties ofmetric externally and internally threaded fasteners, washers,and rivets.1.2 Property requirements and the applicable tests for theirdetermination are specified in individual
4、product standards. Inthose instances where the testing requirements are unique or atvariance with these standard procedures, the product shallspecify the controlling testing requirements.1.3 These test methods describe mechanical tests for deter-mining the following properties:Tests SectionFor Exter
5、nally Threaded Fasteners: 3Product Hardness 3.1Proof Load 3.2.1Method 1, Length Measurement 3.2.3Method 2, Yield Strength 3.2.4Method 3, Uniform Hardness 3.2.5Axial Tension Testing of Full SizeProducts3.4Wedge Tension Testing of Full SizeProducts3.5Tension Testing of Machined TestSpecimens3.6Total E
6、xtension at Fracture Test 3.7For Internally Threaded Fasteners: 4Product Hardness 4.1Proof Load 4.2Cone Proof Load Test 4.3For Washers and Direct TensionIndicators:5General Requirements 5.1Through Hardened Washers 5.2Carburized Washers 5.3For Rivets: 6Product Hardness 6.1Test for Embrittlement of Me
7、tallic CoatedExternally Threaded Fasteners7Test Method for DeterminingDecarburization and Carburization8Test Method for Measuring CompressionLoads (All Finishes) on Direct TensionIndicators Covered by Test MethodF959MAnnex A11.4 The values stated in SI units are to be regarded asstandard. No other u
8、nits of measurement are included in thisstandard.NOTE 1These test methods are the metric companion of Test MethodsF606.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of all of the users of this standard to establishap
9、propriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E4 Practices for Force Verification of Testing MachinesE8M Test Methods for Tension Testing of Metallic MaterialsMetric (Withdrawn 2008)3E10 Test Met
10、hod for Brinell Hardness of Metallic MaterialsE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE83 Practice for Verification and Classification of Exten-someter SystemsE92 Test Method for Vickers Hardness of Metallic Materials(Withdrawn 2010)3E384 Test Method for Knoop and Vickers Hardne
11、ss ofMaterialsF436M Specification for Hardened Steel Washers (Metric)F606 Test Methods for Determining the Mechanical Proper-ties of Externally and Internally Threaded Fasteners,1These test methods are under the jurisdiction of ASTM Committee F16 onFasteners and are the direct responsibility of Subc
12、ommittee F16.01 on TestMethods.Current edition approved July 1, 2012. Published November 2012. Originallyapproved in 1987. Last previous edition approved in 2011 as F606M11. DOI:10.1520/F0606M-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at
13、 serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM I
14、nternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1Washers, Direct Tension Indicators, and RivetsF959M Specification for Compressible-Washer-Type DirectTension Indicators for Use With Structural Fasteners(Metric)F1624 Test Method for Measurement of Hydr
15、ogen Em-brittlement Threshold in Steel by the Incremental StepLoading TechniqueF2328M Test Method for Determining Decarburization andCarburization in Hardened and Tempered Threaded SteelBolts, Screws and Studs (Metric)3. Test Methods for Externally Threaded Fasteners3.1 Product HardnessTests shall b
16、e conducted after theremoval of any surface oxide, decarburization, plating or othercoating. All readings shall be within the hardness values listedin the product specification. The average of all readings on thesame part shall be considered as the product hardness. Testresults shall conform to the
17、product specification for the lotrepresented by the test specimens to be considered conforming.Test specimen preparation and hardness tests shall be con-ducted in accordance with Test Method E18 for Rockwell tests,Test Method E10 for Brinell tests, Test Method E92 for Vickerstests, or Test Method E3
18、84 for Microhardness tests. Themethod used is at the option of the manufacturer, with regardsto the size and grade of the products.3.1.1 Routine Test LocationsFor testing the hardness ofthe finished product, the following test locations can be used:3.1.1.1 For hex and square head bolts, test shall b
19、e con-ducted on the wrench flats, top of head, unthreaded shank, endof bolt or at the arbitration location.3.1.1.2 For studs, products without parallel wrench flats,and for head styles other than hex and square, tests shall beconducted on the unthreaded shank, end of the bolt or stud orat the arbitr
20、ation location.3.1.1.3 Stress-relieved products (see 3.1.1.1 and 3.1.1.2) aremeasured anywhere on the surface or through the cross section.Refer to the product specification for particular test location oruse the arbitration location.3.1.1.4 The Rockwell hardness scale may be used for allproduct dia
21、meters; however, the Brinell hardness is limited toproducts over 30 mm nominal diameter.3.1.2 Laboratory InspectionAfter observing 3.1 and 3.1.1,a minimum of three readings shall be taken on each sample offinished product.3.1.3 Arbitration Test LocationFor purposes of arbitrationbetween the purchase
22、r and seller over reported test results,hardness tests shall be conducted at the mid-radius (r/2) of atransverse section through the threads taken at a distance ofapproximately one diameter from the point end of the bolt orone end of the stud. Four readings shall be taken approximately90 to one anot
23、her on the same plane, if product size permits.Smaller diameter products may also use the opposite parallelsurface area of the bolt head end as sectioned above (see Fig.1). The use of Brinell hardness is limited to product sizesgreater than 48 mm nominal diameter.3.2 Tension TestsIt is preferred tha
24、t fasteners and studs betested full size, and it is customary, when so testing to specifya minimum ultimate load in kilonewtons (or stress in mega-pascals). Sections 3.2 through 3.5 apply when testing exter-nally threaded fasteners full size. Section 3.6 shall apply wherethe individual product speci
25、fications permit the use of ma-chined specimens (see Test Methods E8M).3.2.1 Proof LoadThe proof-load test consists of stressingthe product with a specified load that the product mustwithstand without measurable permanent set. Alternatives thatdetermine the ability of a fastener to pass the proof-lo
26、ad test arethe yield strength test and the uniform hardness test. Any ofthese tests may be used, but the proof-load test ( 3.2.3) shall bethe arbitration method in case of any dispute (see Test MethodsE8M).3.2.2 In both Methods 1 and 2, assemble the product in thefixture of the tension testing machi
27、ned so that six completethreads (except for heavy hex structural bolts, which shall bebased on four threads) are exposed between the grips. This isobtained by freely running the nut or fixture to the threadrunout of the specimen and then unscrewing the specimen sixfull turns. For continuous threaded
28、 fasteners, at least six fullthreads shall be exposed.3.2.3 Test Method 1, Length MeasurementTo ensure con-sistent and repetitive length measurements of the fastener, thethreaded end and top of the bolt head shall have conicalFIG. 1 Hardness Arbitration Test LocationF606M 122depressions made at the
29、approximate axis or center line of thefastener. In the event of a dispute over test results the test shallbe conducted after the removal of all manufacturer or grademarkings, surface oxide, decarburization, plating, other coatingor a combination thereof, to achieve a clean, flat surface andthe conic
30、al depressions shall be created using a lathe or sometype of centering fixture. Care shall be taken to clean all debrisfrom the conical depressions before measuring the part. Whenfasteners are too long to test in the available equipment theymay be cut to 200 mm 6 3 mm and tested using Method 1. Ifth
31、ere is a dispute over results when testing the same part or lotof parts both full size and cut to 200 mm the 200 mm testresults shall determine acceptance. The measuring instrumentshall have pointed anvils that mate with the center linedepressions and be capable of measuring changes in length of0.00
32、25 mm with an accuracy of 0.0025 mm in any 0.025 mmrange. Place the fastener between the measuring anvils. Thefastener shall be rotated at least 360 degrees to assure soundseating. A the position where the lowest value is indicated theinstrument shall be zeroed or the indicated measurement shallbe r
33、ecorded. If using a bolt extensometer, the bolt with attachedextensometer may be assembled into the tension testing ma-chine. If not, mark the fastener so it may be placed as close aspossible to the same position for the second reading. Removeand assemble the fastener into the tension testing machin
34、e asoutlined in 3.4. With a test speed which shall not exceed 3mm/min, as determined with a free-running cross head, axiallyload the fastener to the proof load value specified in the productspecification. This load shall be maintained for a period of 10s before releasing the load. Replace the fasten
35、er between themeasuring anvils and rotate at least 360 degrees as before. thefastener shall be stopped at the position where the lowest valueis indicated. The measurement shall show no permanentelongation. A tolerance of 60.013 mm shall be allowed (formeasurement error only) between the measurement
36、madebefore loading and that made after loading. Variables such asstraightness, thread alignment, or measurement error couldresult in apparent elongation of the product when the specifiedproof load is initially applied. In such cases, the product maybe retested using a 3 % greater load, and shall be
37、consideredacceptable if there is no difference in the length measurementafter this loading within a 0.013-mm measurement tolerance asoutlined.3.2.3.1 Proof Load-Speed and Time of LoadingWhenusing Method 1, the speed of testing, as determined with afree-running cross head, shall not exceed 3 mm/min,
38、and theproof load shall be maintained for a period of 10 s beforereleasing the load.3.2.4 Method 2, Yield StrengthAssemble the product inthe testing equipment as outlined in 3.4.As the load is applied,measure and record the total elongation of the product or anypart of it that includes the exposed t
39、hreads to produce aload-elongation diagram. Determine the load or stress at anoffset equal to 0.2 % of the length of fastener occupied by sixfull threads as shown in Fig. 2, (except for heavy hex structuralbolts, which shall be based on four threads) by the methoddescribed in 3.6.3.1.3.2.4.1 Method
40、2A, Yield Strength for Austenitic StainlessSteel and Nonferrous MaterialsAssemble the product in thetesting equipment as outlined in 3.4. As the load is applied,measure and record the total elongation of the product in orderto produce a load elongation diagram. Determine the load orstress at an offs
41、et equal to 0.2 % strain, based on the length ofthe bolt between the holders as shown in Fig. 2, which will besubject to elongation under load, by using the method de-scribed in 3.6.3.1.3.2.5 Method 3, Uniform HardnessThe fasteners shall betested for hardness as described in 3.1, and in addition, th
42、ehardness shall also be determined in the core. The differencebetween the mid-radius and core hardness shall be not morethan three points on a Rockwell C Scale; and both readingsmust be within product specification.FIG. 2 Tension Testing of Full-Size Fastener (Typical Set-Up)F606M 123NOTE 2This test
43、 is valid for fasteners up to and including 25 mm indiameter.3.3 Fasteners and Studs Too Short for Tension TestingProduct lengths less than those shown in Table 1 for product 5through 20 mm in diameter and less than 3 diameters in lengthfor product greater than 20 mm in diameter, or that do not have
44、sufficient threads for proper engagement, and still leave thespecified number of complete threads exposed between thegrips, shall be deemed too short for tension testing, andacceptance shall be based on a hardness test performed inaccordance with 3.1. If tests other than product hardness arerequired
45、, their requirements should be referenced in the prod-uct specification.3.4 Axial Tension Testing of Full Size Products:3.4.1 Test fasteners in a holder with a load axially appliedbetween the head and a nut or suitable fixture (see Fig. 2),either of which shall have sufficient thread engagement tode
46、velop the full strength of the product. Assemble the nut orfixture on the product, leaving six complete fastener threadsexposed between the grips (except for heavy hex structuralfastener, which shall have four threads exposed between grips).3.4.2 Test studs by assembling one end of the threadedfixtu
47、re to the thread runout. For studs having unlike threads,this shall be the end which has the finer pitch thread, or withthe larger minor diameter. Likewise, assemble the other end ofthe stud in the threaded fixture, leaving six complete threadsexposed between the grips. For continuous studs, at leas
48、t sixcomplete threads shall be exposed between the fixture ends.The maximum speed of the free running cross head shall notexceed 25 mm/min. When reporting the tensile strength of theproduct, calculate the thread stress area as follows:As5 0.7854 D 2 0.9382P!2(1)where:As= thread stress area, mm2,D =
49、nominal diameter of the fasteners or stud, mm, andP = thread pitch, mm.3.4.3 To meet the requirements of the test described in 3.4.1and 3.4.2, the product shall support a load prior to fracture notless than the minimum tensile strength specified in the productspecification for its size, property class, and thread series. Inaddition, fracture shall occur in the body or the threadedsection with no fracture at the juncture of the body and head.When tensile testing externally threaded fasteners made ofaustenitic stainless steel and the test fasteners thread pulls outo
