Compressible-Washer-TypeDirectTensionIndicatorsfor StandardSpecificationfor UsewithStructuralFasteners InchandMetricSeries
This standard is issmed nder the fixed designation F959/F959M; the number immediately following the designation indicates the year
of original aptin or n the case of revisin the year of last revisi. A nmber in parthees indicats te year of last raprl. enouddeaa ao o(stau sel| aq aouls aourqp (elaoupo ue sapeapul (2) ooqsda iduosuadns V
1. Scope*
are to be regarded separately as standard. The values stated in 1.6 The values stated in either SI units or inch-pound unitssystem shall be used independently of the other. Combining each system may not be exact equivalents; therefore eachvalues from the two systems may result in non-conformancewith the standard.
1.1 This specification covers the requirements forpressible-washer-type direct tension indicators (DTIs)tension in a structural bolting assembly. capable of indicating the achievement of a specified minimum
1.2 Eight types of DTIls in nominal diameter sizes %
through 1 %2 in. as well as M16 through M36 are covered: 1.2.1 Zype 325-7DTIs for use with Specification F3125Grade A325 Type 1 bolts or Grade F1852 assemblies. 1.2.2 7ype 3253DTIs for use with Specification F3125Grade A325 Type 3 bolts or Grade F1852 Type 3 assemblies.Grade A490 Type 1 bolts or Grade F2280 assemblies. 1.2.3 Type 490/DTls for use with Specification F3125Grade A490 Type 3 bolts Grade F2280 Type 3 assemblies. 1.2.4 Type 4903DTIs for use with Specification F31251.2.5 Type &.8-7DTIs for use with Specification F3125Grade A325M Type 1 bolts. 1.2.6 Zype 8.8-3DTIs for use with Specification F3125Grade A325M Type 3 bolts. 1.2.7 7ype 10.9-1DTIs for use with Specification F3125Grade A490M Type 1 bolts. 1.2.8 7ype 10.9-3DTls for use with Specification F3125
1.7 The following precautionary statement pertains only tothe test method portions Section 10 and Appendix X1 of this specification: This stcndard does not purport to address all ofthe safetry concerms if ary associated with its use. Ir is theresponsibility of the user of this standard to establish appro- priote sofery health and environmental practices and deter-mine the applicabiliry of regulatory limitations prior to use.
1.8 This interncrional stcndard was developed in accor-dance with internationally recognized principles on standord- ization established in the Decision on Principles for theDevelopment of International Standards Guides and Re-mendations issued by rhe World Trade Organization Techunical Barriers to Trade (TBT) Commirtee.
2. Referenced Documents
2.1 ASTM Standands:2
A325 Specification for Structural Bolts Steel Heat Treated 120/105 ksi Minimum Tensile Strength (Withdrawn 2016)²A325M Specification for Structural Bolts. Steel. HeatTreated 830 MPa Minimum Tensile Strength (Metric) (Withdrawn 2016)*A490 Specification for Structural Bolts Alloy Steel Heat Treated 150 ksi Minimum Tensile Strength (Withdrawn 2016)A490M Specification for High-Strength Steel Bolts Classes 10.9 and 10.9.3 for Structural Steel Joints (Metric)A1059 Specification for Zinc Alloy Thermo-Diffusion Coat- (Withdrawn 2016)ings (TDC) on Steel Fasteners Hardware and Other Products
Grade A490M Type 3 bolts.
against a hardened surface such as a bolt head a hardened nut 1.3 DTIls are intended for installation with the protrusions or a hardened washer. (See Research Council on StructuralConnections: Specification for Structural Joints Using High- Strength Bolts.)
1.4 This specification provides for furnishing Type 3 DTIsto a Chemical Composition Requirement or a Corrosion Resistance Index (CRI) at the manufacturer’s discretion.
1.5 Terms used in this specification are defined in Termi-nology F1789 unless otherwise specified.
B695 Specification for Coatings of Zinc Mechanically De-posited on Iron and SteelF436/F436M Specification for Hardened Steel Washers Inch and Metric DimensionsF606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally ThreadedF1470 Practice for Fastener Sampling for Specified Me- Fasteners Washers Direct Tension Indicators and RivetsF1789 Terminology for F16 Mechanical Fasteners chanical Properties and Performance InspectionF1852 Specification for *Twist Off Type Tension ControlStructural Bolt/Nut/Washer Assemblies Steel Heat Treated 120/105 ksi Minimum Tensile Strength (With-F2280 Specification for *Twist Of Type Tension Control drawn 2016)3Structural Bolt/Nut/Washer Assemblies Steel Heat2016) Treated. 150 ksi Minimum Tensile Strength (WithdrawnF3125 Specification for High Strength Structural Bolts Steel and Alloy Steel Heat Treated 120 ksi (830 MPa) and 150Metric Dimensions ksi (1040 MPa) Minimum Tensile Strength Inch andG101 Guide for Estimating the Atmospheric Corrosion Re-2.2 Research Council on Structural Connections: sistance of Low-Alloy SteelsSpecification for Structural Joints Using High-Strength Bolts2.3 ASME Standand:ASME B18.2.6M Fasteners for Use in Structural Applica- ASME B18.2.6 Fasteners for Use in Structural Applicationstions
3. Ordering Information
3.1 Orders for DTIs under this specification shall includethe following:
3.1.1 Quantity (number of pieces); 3.1.2 Name of product (DTI);3.1.3 Size that is nominal diameter
4. Materials and Manufacture
4.2 Design:
4.3 Heat Treatment:
4.4 Protective Coatings:
5. Chemical Composition
TABLE 1 Chemical Composition Requirements
3.1.4 ASTM designation and year of issue (if not specified.current issue shall be used):8.8-3 10.9-1 10.9-3 (see 1.2); 3.1.5 Type required 325-1 325-3 490-1 490-3 8.8-1 3.1.6 Coating type if required (4.4); 3.1.7 Source inspection if required (Section 11);3.1.9 Any special requirements. 3.1.8 Test reports if required (Section 13); and
4.1 Steel used in the manufacture of DTIs shall be producedby the basic-oxygen or electric-furnace process.
4.2.1 DTIs shall have a configuration produced byextrusion punching pressing or similar forming to permit a measurable decrease in thickness when placed in pression.
deformation shall indicate the tension in a tightened structural 4.2.2 The design shall be such that the degree of plasticbolt. Supplementary indications of tension are permissible.
4.3.1 The heat treatment of DTIs is optional at the manu-chanical and performance requirements. facturer's discretion provided the DTIs meet all of the me-
through-hardening by heating to a temperature above the upper 4.3.2 If heat treatment is performed the process shall betempering by reheating to not less than 800 °F/427 °C.
4.4.1 Unless otherwise specified the DTIs shall be fur-om qug aoes p se o m ud pn protective coatings.
DTIs shall be zinc coated by the mechanical deposition process a gas s pzae ro po z u tin accordance with the requirements of Class 55 of Specifica- tion B695 or the DTIs shall be zinc coated by the thermaldiffusion process in accordance with the requirements of Class25 of Specification A1059.
4.4.3 Other coatings are to be used only when approved bythe DTI manufacturer.
5.1 DTIs shall conform to the full Heat Analysis specified inTable 1 or the requirements of 5.2.
Elemem Composition %Anslytis Heat Type 3 Seriesd Product AnalysisCarboh Type 1 Series 0.300.55 Type 1 Series 0.270.58 Type 3 SeriesaSuftur Max Mangsnese Phosphorus Max 0.500.90 0.04 0.06 0.040 0.050 0.470.93 0.048 0.053 0.045 0.055Sllicon Chromium - 0.150.35 0.450.65 0.130.37 0.420.68Nickel Copper 0.250.45 0.250.45 ... 0.220.48 0.220.48
npod d npd g od sn u peuew o mfytTthilsinfitisi
5.1.1 For all types furnished to the chemical positionsin Table 1 Product Analysis may be made by the purchaserfrom finished DTls representing each lot. The chemical - position shall conform to the requirements given in Table 1.Product Analysis.
7.1.1 At the manufacture's discretion the number of pro-trusions may be altered provided there are no fewer than fourprotrusions and the performance requirements of Section 6 are maintained.
altermatively match the minimum outside diameter require- 7.1.2 The minimum outside diameter of the DTls maywasher. ments of the matching nominal size ASTM F436/F436M
5.2 Type 3 products having Copper Phosphorus and Sulfurconforming to Table I and a Corrosion Resistance Index of 6or higher calculated on the basis of the Heat Analysis as described in Guide G101 shall be considered acceptable. SeeNote 1.
8. Workmanship Finish and Appearance
8.1 The DTIs shall be mercially smooth and free ofinjurious material or manufacturing defects that would affect their performance.
for calculation of an atmospheric corrosion index has been verified only Note 1The user is cautioned that the Guide G101 predictive equationfor the position limits stated in that guide.
9. Number of Tests and Retests
pu ad on aqedde ou ne saseuy npd 1'stors furnished to a CRI of 6 or higher. Acceptance shall be based on the CRI of 6 or higher calculated from the HeatAnalysis. Other specified Type 3 Steels with Copper Phosphorus and Sulfur conforming to the specified limits and a Corrosion Resistance of 6 or higher are acceptable in lieu ofpliance with the full specified Chemical Compositions.
9.1 Responsibiliry:
9.1.1 The DTI manufacturer shall inspect each lot of DTIsprocedures described in 9.2. prior to shipment in accordance with the quality assurance
9.1.2 The purchaser is required to maintain the identifica-product is installed in its service application. tion and integrity of each lot following delivery until the
6.Performance Requirements
9.2 Production Lor Merhod:
are pressed to 0.015 in. or metric series DTls to 0.4 mm 6.1 Compression LoadsWhen the gap of inch series DTIsthe pression load shall conform to the requirements speci- fied in Table 2.
identification controlquality assurance plan. The manufac- 9.2.1 All DTIs shall be processed in accordance with a lottion lot of DTls from raw material selection through all turer shall identify and maintain the integrity of each produc-number each lot shall be tested and the inspection test reports shipment. Each lot shall be assigned its own lot-identificationfor each lot shall be retained.
6.2 HardnessWhen DTIs are heat-treated in accordancewith 4.3.2 the maximum hardness shall be HRC37.
7. Dimensions
9.2.2 The minimum number of samples to be tested toapplicable) shall be in accordance with the requirements determine pression loads and coating thickness (whenspecified in Guide F1470.
conform to the dimensional and related requirements of 7.1 Except as permited by 7.1.1 and 7.1.2 the DTls shallASME B18.2.6 for inch series and ASME B18.2.6M for metric series products.
treated coated or otherwise altered by a subcontractor or 9.3 Number of Tests After AlterationsIf DTIs are heataccordance with 9.2 prior to shipment to the purchaser afer all manufacturer subsequent to testing they shall be tested inalterations have been pleted.
TABLE 2 Acceptable Range of Compression Loads
Compression Load Range in Thousands of Pounde. (kips)DTI Size (Nominal Diameter n.) Types 325 and pue 06 sod325-3 1214 490-3 1518% % % 1923 2834 3947 2429 35-42 49591% 1 5161 6477 6477 1% 97117 8198 102-122 121145DTI Size (Nominal Diameter 1 Compresson Load Range for Metic 118143 Series in Klonewtons. (KN) 148178mm) Types 8.8-1 and 8.8-3 Types 10.9-1 and 10.9-3M16 M20 142170 91109 114131 179206M24 M27 M22 267320 176211 205246 221254 257296 334384M30 M36 326391 475570 408469 595684
Resistance Index the CRI number shall be calculated for each 9.4 When Type 3 products are furnished to a Corrosionlot.
10. Test Methods
dance with Test Methods F606/F606M. 10.1 Compression load tests shall be conducted in accor-
in Table 2 regardless of surface coating (lubricants included). 10.1.1 All test specimens shall conform to the values given
10.2 DTIs for tests shall be tested full size *as received"without any special preparation.
10.3 Results from routine hardness tests performed duringproduction of heat-treated DTIs satisfy the requirement forverification that product hardness does not exceed HRC37.
10.4 The Corrosion Resistance Index shall be calculated forthe Heat Analysis in accordance with Guide G101 PredictiveMethod based on the data of Larabee and Coburm.
11. Inspection
12. Rejection
13. Test Reports
14. Responsibility
11.1 If the inspection described in 11.2 is required by thepurchaser it shall be specified in the inquiry and contract or order.
11.2 The purchaser’s quality assurance representative shallhave free entry to all parts of the manufacturer’s works that concern the manufacture of the DTIs ordered. The manufac-turer shall afford the quality assurance representative all reasonable facilities to satisfy him that the DTls are beingfurnished in accordance with this specification. All tests andinspections required by this specification that are requested by the purchaser's representative shall be made before shipmentthe operation of the plant. and shall be conducted so as not to interfere unnecessarily with
specification shall be rejected. Rejection should be reported to 12.1 DTIs that fail to conform to the requirements of thisthe producer or supplier promptly and in writing. In case ofdissatisfaction with the results of the test the producer or supplier may make claim for a rehearing.
furnish a test report as described in 13.2. 13.1 When specified on the order the manufacturer shall
13.2 The manufacturers shall furmish a test report for eachThe report shall show the heat number (to ensure that the production lot from which DTIs are supplied to fil a shipment.chemical position is on record and could be furmished uponrequest) pression test loads a statement indicating that product hardness is less than HRC38 Corrosion ResistanceIndex Number when applicable measured thickness of protec- tive coatings gap nominal size production lot identification number ASTM designation type and issue date and purchase order number.
13.3 When Type 3 products are fumished to a CorrosionResistance Index the CRI number shall be furmished for each lot.
14.1 The party responsible for the DTI shall be the organi-zation that supplies the DTI to the purchaser.
15. Produet Marking
15.1 Each DTI shall be marked to identify the lot number manufacturer or private label distributor as appropriate and type (see 1.2). Additional markings at the option of themanufacturer are permissible.
15.2 All markings shall be depressed on the same face of theDTI as the protrusions. Raised markings are prohibited.
15.3 All DTIs shall have circumferential indentations orother markings that correspond to and are in alignment withfeeler gage enty spaces to indicate where feeler gages are tobe inserted. Such indentations or markings shallbe equally spacedaround the DTI and shall be clearly visible but no so large as to interfere with the function of the DTL
16. Packaging and Package Marking
16.1 Packaging:
16.1.1 Unless otherwise specified on the inquiry and order packaging shall be in accordance with the supplier'’s normal practice.
16.2 Package Marking:
with the following information: 16.2.1 Each shipping unit shallinclude or be marked plainly
ASTM designation and type
Size
Name and brand or trademark of the manufacturer or
Number of pieces Name of product Lot identification number Finish and Country of origin.
17. Storage
17.1 The DTIs shall be stored in an environment thatpreserves the surface condition supplied by the manufacturer.
18. Keywords
DTI; indicators 18.1 pressible-washer-type; direct tension indicators;
(Nonmandatory Information)
X1. FIELD TESTING OF DIRECT TENSION INDICATORS FOR BOLT TENSION
DTIs may be field tested in a bolt tension calibrator withStructural Joints Using High-Strength Bolts to determine a job inspection gap. The job inspection gap shall be a gap less thantension. the measured DTI test gap at 1.05x the minimum required bolt
bolts nuts and flat washers according to the provisions of thehard steel connections care should be taken to tension the bolts Because bolt tension calibrators are “soft" devices unlikeResearch Council of Structural Connections Specification forwith a non-impacting wrench so the tension readings can berecorded exactly.
SUMMARY OF CHANGES
Committee F16 has identified the location of selected changes to this standard since the last issue (F95917)that may impact the use of this standard. (December 1 2017.)
(7) Revised Table 1 to clarify that C1050 is permissible and pnbu ou s 1 ad um pddns oq Keu g od1 e(2) Revised Table 2Increased pression load require-ments on larger diameter Type 325 DTls to match revised matching bolt requirements.
Committee F16 has identified the location of selected changes to this standard since the last issue (F95915)that may impact the use of this standard. (April 15 2017.)
(1) Corrected tile and standard number for consistency with a (3) Eliminated Certificates of Compliance.dual inch/metric standard. (2) Updated Scope section to point to F3125. (4) Added a maximum hardness.
sstfsaeif fyk of intringement af such rights are entirely thelr own responsibity. ASTM intmatona/ takes no poslion respecting th waldly cf ary paton ights assead in conecto mh any itemmenioned
This standardis sjet feisont anyme by heeponible echical tee andmsberevwedevey five year and not revised therreapproved or wthrawn. Yourments are ited eherforrevision of this standard orfor adilona standards and shoul be adtressed to ASTM Intemations/ Headguarters. Your ments wi receive careful consideration at a meeting of themake your vw knw ASTM Commitee o Stands at th aress show b responsibe fchnical mife which you may atend. f you feef that your ments have not received a fair hearing you should
This standard is copyrighted by ASTM Intermational 100 Barr Harbor Drive PO Box C700 West Conshohocken PA 19428-2959 adtress or ar 610-832-9585 (phone) 610-832-g55 (fax)or service@ (e-mai0:or mrough the ASTM website ( Pemission rghts to photocgpy he standarf may aiso be securd fom the Copyright Cioarance Centar 222 United States. Indvual reprints (single or mufiple copies) of this standard may be octained by contacting ASTM ar the aboveRosewood Drve Damvers MA 01923 Tel: (976) 646-2600; hfp://
