1、Designation: F 959M 06METRICStandard Specification forCompressible-Washer-Type Direct Tension Indicators forUse With Structural Fasteners Metric1This standard is issued under the fixed designation F 959M; the number immediately following the designation indicates the year oforiginal adoption or, in
2、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 Defense.1. Scope*1.1 T
3、his specification covers the requirements forcompressible-washer-type direct tension indicators capable ofindicating the achievement of a specified minimum bolt tensionin a structural bolt.1.2 Two types of direct tension indicators in nominaldiameter sizes M16 through M36 are covered:1.2.1 Type 8.8d
4、irect tension indicators for use with Speci-fication A 325M bolts, and1.2.2 Type 10.9direct tension indicators for use withSpecification A 490M bolts.1.3 Direct tension indicators are intended for installationunder either a bolt head or a hardened washer. (See ResearchCouncil on Structural Connectio
5、ns: Specification for StructuralJoints Using ASTM A 325 or A 490 Bolts.)1.4 The following precautionary statement pertains only tothe test methods portions, Section 12, and Appendix X1 of thisspecification: This standard does not purport to address all ofthe safety concerns, if any, associated with
6、its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A 325M Specification for Structural Bolts, Steel, HeatTreated 830 MPa
7、 Minimum Tensile Strength MetricF 436M Specification for Hardened Steel Washers MetricA 490M Specification for High-Strength Steel Bolts,Classes 10.9 and 10.9.3, for Structural Steel Joints MetricB 695 Specification for Coatings of Zinc MechanicallyDeposited on Iron and SteelD 3951 Practice for Comm
8、ercial PackagingF 606M Test Methods for Determining the MechanicalProperties of Externally and Internally Threaded Fasteners,Washers, and Rivets MetricF 1470 Guide for Fastener Sampling for Specified Mechani-cal Properties and Performance Inspection2.2 Research Council on Structural Connections Stan
9、dard:Specification for Structural Joints Using ASTM A 325 or A490 Bolts33. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 compressible-washer-type direct tension indicator,na washer-type element inserted under the bolt head orhardened washer, having the capability of indicating
10、theachievement of a required minimum bolt tension by the degreeof direct tension indicator plastic deformation. Hereafter re-ferred to as direct tension indicator.4. Ordering Information4.1 Orders for direct tension indicators under this specifica-tion shall include the following:4.1.1 Quantity (num
11、ber of pieces);4.1.2 Name of product (direct tension indicator);4.1.3 Size, that is, nominal diameter;4.1.4 ASTM designation and year of issue (if not specified,current issue shall be used);4.1.5 Type required, 8.8 or 10.9 (see 1.2);4.1.6 Coating type, if required (see 5.4);4.1.7 Source inspection,
12、if required (Section 13);4.1.8 Certificates of compliance or test reports, if required(Section 15); and1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.02 Steel Bolts, Nuts,Rivets and Washers.Current edition approved
13、 Nov. 1, 2006. Published November 2006. Originallyapproved in 1994. Last previous edition approved in 2004 as F 959M 04.2For 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
14、 to the standards Document Summary page onthe ASTM website.3Available from Research Council on Structural Connections at www.boltcoun-cil.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 194
15、28-2959, United States.4.1.9 Any special requirements.5. Materials and Manufacture5.1 Steel used in the manufacture of direct tension indica-tors shall be produced by the basic-oxygen or electric-furnaceprocess.5.2 Design:5.2.1 Direct tension indicators shall have a configurationproduced by extrusio
16、n, punching, pressing, or similar forming,to permit a measurable decrease in thickness when placed incompression.5.2.2 The design shall be such that the degree of plasticdeformation shall indicate the tension in a tightened structuralbolt.5.3 Heat TreatmentThe process used for heat treatment ofDTIs
17、shall be through-hardening by heating to a temperatureabove the upper transformation temperature, quenching in aliquid medium, and then retempering by reheating to a suitabletemperature to attain desired mechanical/performance proper-ties.5.4 Protective Coatings:5.4.1 Unless otherwise specified, the
18、 direct tension indica-tors shall be furnished “plain,” with the “as fabricated” surfacefinish without protective coatings.5.4.2 When “zinc coated” is specified, the direct tensionindicators shall be zinc coated by the mechanical depositionprocess in accordance with the requirements of Class 50 ofSp
19、ecification B 695.5.4.3 When “baked epoxy” is specified, the epoxy shall be0.025 to 0.05 mm thick applied over the zinc coating specifiedin 5.4.2. The epoxy shall not flake off exposed surfaces duringinstallation.5.4.4 Other coatings are to be used only when approved bythe direct tension indicator m
20、anufacturer.6. Chemical Composition6.1 The direct tension indicators shall conform in chemicalcomposition to the limits given in Table 1.6.2 Product analysis may be made by the purchaser fromfinished direct tension indicators representing each lot. Thechemical composition shall conform to the requir
21、ements givenin Table 1, Product Analysis.7. Performance Requirements7.1 Compression LoadsWhen compressed to the gapspecified in Table 2, the compression load shall conform to therequirements specified in Table 3.8. Dimensions8.1 The direct tension indicators shall conform to thedimensions specified
22、in Table 4.9. Workmanship, Finish, and Appearance9.1 The direct tension indicators shall be commerciallysmooth and free of injurious material or manufacturing defectsthat would affect their performance.10. Number of Tests and Retests10.1 Responsibility:10.1.1 The direct tension indicator manufacture
23、r shall in-spect each lot of direct tension indicators prior to shipment inaccordance with the quality assurance procedures described in10.2.10.1.2 The purpose of a lot inspection testing program is toensure that each lot conforms to the requirements of thisspecification. For such a plan to be fully
24、 effective, it is essentialthat the purchaser continue to maintain the identification andintegrity of each lot following delivery until the product isinstalled in its service application.10.2 Production Lot Method:10.2.1 All direct tension indicators shall be processed inaccordance with a lot identi
25、fication controlquality assuranceplan. The manufacturer shall identify and maintain the integrityof each production lot of direct tension indicators from rawmaterial selection through all processing operations and treat-ments to final packing and shipment. Each lot shall be assignedits own lot-ident
26、ification number, each lot shall be tested, andthe inspection test reports for each lot shall be retained.10.2.2 For purposes of assigning an identification numberand from which test samples shall be selected, a production lot,shall consist of all direct tension indicators processed essen-tially tog
27、ether through all operations to placing in the shippingcontainer that are of the same nominal size, produced from thesame mill heat of steel, and heat treated in the same heattreatment cycle.TABLE 1 Chemical Composition RequirementsElementComposition, %HeatAnalysisProductAnalysisType 8.8 and 10.9Typ
28、e 8.8-3 and Type10.9-3Type 8.8 and Type10.9Type 8.8-3 and Type10.9-3ACarbon 0.300.55 . 0.270.58 .Manganese 0.500.90 . 0.470.93 .Phosphorus, max 0.04 0.040 0.048 0.045Sulfur, max 0.050 0.050 0.053 0.055Silicon 0.150.35 0.150.35 0.130.37 0.130.37Chromium . 0.450.65 . 0.420.68Nickel . 0.250.45 . 0.220.
29、48Copper . 0.250.45 . 0.220.48AWeathering steel DTIs are also permitted to be manufactured from any of the Type 3 steels in the chemical composition sections of Specifications A 325M and F 436M.F959M06210.2.3 The minimum number of samples to be tested todetermine compression loads and coating thickn
30、ess (whenapplicable) shall be in accordance with the requirementsspecified in Guide F 1470.10.3 Number of Tests After AlterationsIf direct tensionindicators are heat treated, coated, or otherwise altered by asubcontractor or manufacturer subsequent to testing, they shallbe tested in accordance with
31、10.2 prior to shipment to thepurchaser after all alterations have been completed.11. Specimen Preparation11.1 Indicators for tests shall be tested full size “as re-ceived,” without any special preparation.11.2 All test specimens shall conform to the values given inTable 3, regardless of surface coat
32、ing (lubricants included).12. Test Methods12.1 Direct tension indicators shall be tested in accordancewith Test Methods F 606M.13. Inspection13.1 If the inspection described in 13.2 is required by thepurchaser, it shall be specified in the inquiry and contract ororder.13.2 The purchasers quality ass
33、urance representative shallhave free entry to all parts of the manufacturers works thatconcern the manufacture of the direct tension indicatorsordered. The manufacturer shall afford the quality assurancerepresentative all reasonable facilities to satisfy him that thedirect tension indicators are bei
34、ng furnished in accordance withthis specification. All tests and inspections required by thisspecification that are requested by the purchasers representa-tive shall be made before shipment and shall be conducted soas not to interfere unnecessarily with the operation of the plant.14. Rejection14.1 D
35、irect tension indicators that fail to conform to therequirements of this specification shall be rejected. Rejectionshould be reported to the producer or supplier promptly and inwriting. In case of dissatisfaction with the results of the test, theproducer or supplier may make claim for a rehearing.15
36、. Certification15.1 When specified on the order, the manufacturer shallfurnish a test report as described in 15.2 or a certificate ofcompliance as described in 15.3, whichever is required.15.2 When test reports are required, the manufacturers shallfurnish a test report for each production lot from w
37、hich directtension indicators are supplied to fill a shipment. The reportshall show the heat number (to ensure that the chemicalcomposition is on record and could be furnished upon request),compression test loads, measured thickness of protective coat-ings, gap, nominal size, production lot identifi
38、cation number,ASTM designation, type and issue date, and purchase ordernumber.15.3 When certificates of compliance are required, themanufacturer shall furnish a certificate certifying that theindicators have been manufactured and tested and conform tothe requirements of this specification. The certi
39、ficate shallshow the production lot identification number, nominal size,ASTM designation, type and issue date, and purchase ordernumber.16. Responsibility16.1 The party responsible for the direct tension indicatorshall be the organization that supplies the direct tensionindicator to the purchaser.17
40、. Product Marking17.1 Each direct tension indicator shall be marked to iden-tify the lot number; manufacturer or private label distribution,as appropriate; and type (see 1.2).17.2 All markings shall be depressed on the same face of thedirect tension indicators as the protrusions. Raised markingsare
41、prohibited.17.3 All direct tension indicators shall have circumferentialindentations spaced equally around the outside circumference,corresponding to and in alignment with each feeler gage entryspace. Indentations shall be clearly visible but not so large asto interfere with the function of the dire
42、ct tension indicator.(See Fig. 1).17.3.1 The circumferential indentations indicate where thefeeler gage must be inserted.18. Packaging and Package Marking18.1 Packaging:18.1.1 Unless otherwise specified, packaging shall be inaccordance with Practice D 3951.18.1.2 Packaging shall be performed as soon
43、 as is practicalfollowing final testing.18.1.3 When special packaging requirements are required,they shall be defined at the time of the inquiry and order.18.2 Package Marking:18.2.1 Each shipping unit shall include or be marked plainlywith the following information:18.2.1.1 ASTM designation and typ
44、e,18.2.1.2 Size,TABLE 2 Direct Tension Indicator Gap for Compression LoadTestingDirect Tension Indicator FinishGap, mmSpecification8.8Specification10.9Plain finish 0.4 0.4Mechanically galvanized 0.4 . . .Baked epoxy coating onMechanically deposited zinc 0.4 . . .TABLE 3 Acceptable Range of Compressi
45、on LoadsDirect Tension Indicator Size(Nominal Diameter, mm)Compression Load Range, kNType 8.8 Type 10.9M16 91109 114131M 20 142170 179206M 22 176211 221254M 24 205246 257296M 27 267320 334384M 30 326391 408469M 36 475570 595684F959M06318.2.1.3 Name and brand or trademark of the manufactureror privat
46、e label distributor,18.2.1.4 Number of pieces,18.2.1.5 Purchase order number,18.2.1.6 Name of product,18.2.1.7 Lot identification number,18.2.1.8 Finish, and18.2.1.9 Country of origin.19. Storage19.1 The direct tension indicators shall be stored in anenvironment that preserves the surface condition
47、supplied bythe manufacturer.20. Keywords20.1 compressible-washer-type; direct tension indicators;DTI; indicatorsTABLE 4 Dimensions of Direct Tension IndicatorsDirectTensionIndicatorSize(NominalDiameter,mm)AType 8.8 Type 10.9 All TypesOutside Diameter(OD), mmNumber ofProtrusions(EquallySpaced)Thickne
48、ss, mmOutside Diameter(OD), mmNumber ofProtrusions(EquallySpaced)Thickness, mmInside Diameter (ID),mmProtrusionTangentialDiameter(PTD),max, mm(see Fig.1)min maxWithoutProtrusion,minWithProtrusion,maxmin maxWithoutProtrusion,minWithProtrusion,maxUncoatedmin maxM16 35.2 36.8 4 3.2 5.5 35.2 36.8 4 3.6
49、6.0 16.75 16.85 25M 20 44.0 46.0 5 3.6 6.0 44.0 46.0 6 3.6 6.0 20.95 21.05 29M 22 48.4 50.6 5 3.6 6.0 48.4 50.6 6 4.0 7.0 23.05 23.15 33M 24 52.8 55.2 5 4.0 7.0 52.8 55.2 6 4.0 7.0 25.15 25.25 38M 27 59.4 62.1 6 4.0 7.0 59.4 62.1 7 4.0 7.0 28.30 28.40 43M 30 66.0 69.0 7 4.0 7.0 66.0 60 8 4.8 7.5 31.45 31.55 46.5M 36 79.2 82.8 8 4.8 7.5 79.2 82.8 9 4.8 7.5 37.75 37.85 56ANominal direct tension indicator sizes are intended for use with fasteners of the same nominal diameter.FIG. 1 Direct Tension Indicator Protrusion Tangential Diameter (P
