1、Designation: F 606M 07METRICStandard Test Methods forDetermining the Mechanical Properties of Externally andInternally Threaded Fasteners, Washers, and RivetsMetric1This standard is issued under the fixed designation F 606M; the number immediately following the designation indicates the year oforigi
2、nal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of De
3、fense.1. Scope1.1 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 indiv
4、idual 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
5、 Externally 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 Size Products 3.4Wedge Tension Testing of Full Size Products 3.5Tension Testing of Machined Test Specimen
6、s 3.6Total Extension at Fracture Test 3.7For Internally Threaded Fasteners: 4Product Hardness 4.1Proof Load 4.2Cone Proof Load Test 4.3For Washers and Direct Tension Indicators: 5General Requirements 5.1Through Hardened Washers 5.2Carburized Washers 5.3For Rivets: 6Product Hardness 6.1Test for Embri
7、ttlement of Metallic Coated Externally ThreadedFasteners 7Test Method for Determining Decarburization and Carburization 8Test Method for Measuring Compression Loads (All Finishes)on Direct Tension Indicators Covered by Test Method F 959M Annex A11.4 This standard does not purport to address all of t
8、hesafety concerns, if any, associated with its use. It is theresponsibility of all of the users of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.NOTE 1These test methods are the metric companion of Test Methods
9、F 606.2. Referenced Documents2.1 ASTM Standards:2E4 Practices for Force Verification of Testing MachinesE8M Test Methods for Tension Testing of Metallic Mate-rials MetricE10 Test Method for Brinell Hardness of Metallic Materi-alsE18 Test Methods for Rockwell Hardness of MetallicMaterialsE83 Practice
10、 for Verification and Classification of Exten-someter SystemsE92 Test Method for Vickers Hardness of Metallic Mate-rialsE 384 Test Method for Microindentation Hardness of Ma-terialsF 436M Specification for Hardened Steel Washers MetricF 606 Test Methods for Determining the Mechanical Prop-erties of
11、Externally and Internally Threaded Fasteners,1These test methods are under the jurisdiction of ASTM Committee F16 onFasteners and are the direct responsibility of Subcommittee F16.01 onTest Methods.Current edition approved Sept. 1, 2007. Published September 2007. Originallyapproved in 1987. Last pre
12、vious edition approved in 2005 as F 606M 05.2For 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.1Copyright ASTM I
13、nternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Washers, Direct Tension Indicators, and RivetsF 959M Specification for Compressible-Washer-Type Di-rect Tension Indicators for Use With Structural FastenersMetricF 1624 Test Method for Measurement of Hy
14、drogen Em-brittlement Threshold in Steel by the Incremental StepLoading TechniqueF 2328M Test Method for Determining Decarburization andCarburization in Hardened and Tempered Threaded SteelBolts, Screws and Studs Metric3. Test Methods for Externally Threaded Fasteners3.1 Product HardnessTests shall
15、be 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
16、 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 Rockwelltests, Test Method E10for Brinell tests, Test Method E92forVickers tests, or Test Method E 3
17、84 for Microhardness tests.The method used is at the option of the manufacturer, withregards to 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
18、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
19、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
20、meters; however, the Brinell hardness is limited toproducts over 30 mm nominal diameter.3.1.2 Laboratory InspectionAfter observing 3.1 and3.1.1, a minimum of three readings shall be taken on eachsample of finished product.3.1.3 Arbitration Test LocationFor purposes of arbitrationbetween the purchase
21、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
22、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
23、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
24、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
25、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
26、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
27、 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 LocationF606M072depressions made at the a
28、pproximate axis or center line of thefastener. If raised or depressed markings on the head interferewith the placement of the measuring depressions, the headshall be carefully ground. The measuring instrument shall havepointed anvils that mate with the center line depressions and becapable of measur
29、ing changes in length of 0.0025 mm with anaccuracy of 0.0025 mm in any 0.025 mm range. Place thefastener between the measuring anvils and rotate it approxi-mately14 turn to the left center, right then center again toassure sound seating. Zero the instrument or record indicatedmeasurement. If using a
30、 bolt extensometer, the bolt withattached extensometer may be assembled into the tensiontesting machine. If not, mark the fastener so it may be placedas close as possible to the same position for the second reading.Remove and assemble the fastener into the tension testingmachine as outlined in 3.4.
31、With a test speed which shall notexceed 3 mm/min, as determined with a free-running crosshead, axially load the fastener to the proof load value specifiedin the product specification. This load shall be maintained fora period of 10 s before releasing the load. Replace the fastenerbetween the measuri
32、ng anvils and rotate as before, stoppingwith the mark at the same approximate position as the firstreading. The measurement shall show no permanent elonga-tion. A tolerance of 60.013 mm shall be allowed (for mea-surement error only) between the measurement made beforeloading and that made after load
33、ing. Variables such as straight-ness, thread alignment, or measurement error could result inapparent elongation of the product when the specified proofload is initially applied. In such cases, the product may beretested using a 3 % greater load, and shall be consideredacceptable if there is no diffe
34、rence 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, and theproof load shall be maintained for
35、 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 threads to produce aload-elongation diagra
36、m. 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 2A, Yield Strength for Austenitic Stainle
37、ssSteel 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 offset equal to 0.2 % strain, based on the le
38、ngth 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, thehardness shall also be determined in the
39、 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.NOTE 2This test is valid for fasteners up to and including 25 mm indiameter.3.3 Fasteners and Studs Too Short for Tension Test
40、ingProduct 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 havesufficient threads for proper engagement, and still leave theFIG. 2 Tension Testing of Full-Size Fastener (Typi
41、cal Set-Up)F606M073specified 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, their requirements should be referenced
42、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 todevelop the full strength of the product. As
43、semble 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 threadedfixture to the thread runout. For studs having
44、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 least sixcomplete threads shall be exposed bet
45、ween 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 = nominal diameter of the fasteners or stud,
46、 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, fractur
47、e shall occur in the body or the threadedsection with no fracture at the juncture of the body and head.3.5 Wedge Tension Testing of Full-Size ProductThewedge tensile strength of a hex or square-head fastener,socket-head cap screw, (with the exception of socket button orflat countersunk head products
48、) or stud is the tensile load thatthe product is capable of sustaining when stressed with awedge under the head. The purpose of this test is to obtain thetensile strength and demonstrate the “head quality” and duc-tility of the product.3.5.1 Wedge Tension Testing of Fasteners Determine theultimate l
49、oad of the fastener as described in 3.4 except place awedge under the fastener head. When both wedge and proofload testing are required by the product specification use theproof load-tested fastener for wedge testing. The wedge shallhave a minimum hardness of 45 HRC.Additionally, the wedgeshall have a minimum thickness of one half the nominalfastener diameter (measure at the thin side of the hole, Fig. 3).The wedge shall have an included angle as shown in Table 1for the product type being tested. The hole in the wedge shallhave a clearance over the nomina
