Specification forStructural Joints UsingHigh-Strength BoltsAugust 1, 2014(includes April 2015 Errata)Supersedes the December 31, 2009 Specification forStructural Joints Using High-Strength Bolts.Prepared by RCSC Committee A.1—Specifications andapproved by the Research Council on Structural Connections.www.boltcouncil.orgRESEARCH COUNCIL ON STRUCTURAL CONNECTIONSc/o AISC, One East Wacker Drive, Suite 700, Chicago, Illinois 60601

16.2-iiRCSC 2014byResearch Council on Structural ConnectionsAll rights reserved. This book or any part thereof must not be reproduced in any formwithout the written permission of the publisher.The information presented in this publication has been prepared in accordance withrecognized engineering principles and is for general information only. While it isbelieved to be accurate, this information should not be used or relied upon for anyspecific application without competent professional examination and verification ofits accuracy, suitability, and applicability by a licensed professional engineer,designer, or architect. The publication of the material contained herein is notintended as a representation or warranty on the part of the Research Council onStructural Connections or of any other person named herein, that this informationis suitable for any general or particular use or of freedom from infringement of anypatent or patents. Anyone making use of this information assumes all liabilityarising from such use.Caution must be exercised when relying upon other specifications and codesdeveloped by other bodies and incorporated by reference herein since such materialmay be modified or amended from time to time subsequent to the printing of thisedition. The Institute bears no responsibility for such material other than to refer toit and incorporate it by reference at the time of the initial publication of this edition.Printed in the United States of AmericaSpecification for Structural Joints Using High-Strength Bolts, August 1, 2014RESEARCH COUNCIL ON STRUCTURAL CONNECTIONS

16.2-iiiPREFACEThe purpose of the Research Council on Structural Connections (RCSC) is:(1) To stimulate and support such investigation as may be deemed necessary andvaluable to determine the suitability, strength and behavior of various types ofstructural connections;(2) To promote the knowledge of economical and efficient practices relating to suchstructural connections; and,(3) To prepare and publish related specifications and such other documents as necessaryto achieving its purpose.The Council membership consists of qualified structural engineers from academic andresearch institutions, practicing design engineers, suppliers and manufacturers of fastenercomponents, fabricators, erectors and code-writing authorities.The first Specification approved by the Council, called the Specification forAssembly of Structural Joints Using High Tensile Steel Bolts, was published in January1951. Since that time the Council has published seventeen successive editions. Each wasdeveloped through the deliberations and approval of the full Council membership andbased upon past successful usage, advances in the state of knowledge and changes inengineering design practice. This edition of the Council’s Specification for StructuralJoints Using High-Strength Bolts continues the tradition of earlier editions. The majorchanges are: Appendix B provisions were incorporated directly into Section 5 of the Specification.Tolerances for the Turn-of- Nut method were adjusted.Glossary definitions for “pretension” were added.F1136 coating on F1852 and F2280 bolts was deleted from Table 2.1 in recognitionthat this coating has not been approved by ASTM for use on TC bolts. Slip critical equations in Section 5.4 were updated for consistent with the AISCSpecification. Clarification language was provided for approval requirements for hole sizes otherthan standard holes. The snug-tightened joint definition was redefined back to the 2004 definition due toissues regarding turn-of-nut tension requirements. Errata issued in April 2015 consist of:o Section 3.2.2(3), corrected slip class of galvanized faying surfaceso Section 8.1, corrected requirements for the snug tight conditiono Section A4.2, provided substitute equation for deleted referenceIn addition, typographical changes have been made throughout this Specification.Specification for Structural Joints Using High-Strength Bolts, August 1, 2014RESEARCH COUNCIL ON STRUCTURAL CONNECTIONS

16.2-ivBy the Research Council on Structural Connections,Allen J. HarroldChairmanSalim V. BrahimiVice ChairmanToby AndersonRick BabikRodney L. BaxterPeter C. BirkemoeDavid W. BogatyDavid BornsteinRichard C. BrownBruce M. ButlerGarret O. ByrneCharles J. CarterHelen H. ChenRobert J. ConnorBastiaan E. CornelissenChris CurvenNick E. DealJamie DeckardDean G. DroddyPeter DusickaMattew R. EathertonDouglas B. FerrellJohn W. FisherPatrick J. FortneyKarl H. FrankMichael C. FrielJames B. GialamasRodney D. GibbleBill GermugaJerome F. HajjarRobert A. Hay IIITodd HelwigPaul HerbstIan C. HodgsonCharles E. HundleyEmmanuel P. JeffersonRonald B. JohnsonCharles J. KanapickiPeter F. KasperDaniel J. KaufmanJames S. KennedyRichard F. KnoblochLawrence KruthGeoffrey L. KulakChad M. LarsonBill R. Lindley, IIKenneth B. LohrHussam N. MahmoudCurtis MayesCarly McGeeJonathan C. McGormleyDavid L. McKenzieNeil L. McMillanJinesh K. MehtaKevin MenkeEugene R. MitchellHeath MitchellThomas M. MurrayJustin OcelAaron PrchlikGian A. RassatiJames M. RiclesThomas J. SchlaflyGerald E. SchroederRachel ShanleyDavid F. SharpRobert E. Shaw, Jr.Victor ShneurW. Lee ShoemakerJim SomaJames A. SwansonThomas S. Tarpy, Jr.William A. ThorntonRaymond H.R. TideBrad TinneyTodd C. UdeAmit H. VarmaFloyd J. VissatCharles J. WilsonAlfred F. WongJoseph A. YuraJoe GreeensladeSecretary/TreasurerSpecification for Structural Joints Using High-Strength Bolts, August 1, 2014RESEARCH COUNCIL ON STRUCTURAL CONNECTIONS

16.2-vTABLE OF CONTENTSSymbols . viiGlossary . ixSection 1. General Requirements .1.1. Scope .1.2. Loads, Load Factors and Load Combinations .1.3. Design for Strength Using Load and Resistance Factor Design (LRFD) .1.4. Design for Strength Using Allowable Strength Design (ASD) .1.5. Referenced Standards and Specifications .1.6. Drawing Information .1111234Section 2. Fastener Components . 52.1. Manufacturer Certification of Fastener Components . 52.2. Storage of Fastener Components . 52.3. Heavy-Hex Structural Bolts . 62.4. Heavy-Hex Nuts . 132.5. Washers . 142.6. Washer-Type Indicating Devices . 142.7. Twist-Off-Type Tension-Control Bolt Assemblies . 152.8. Alternative-Design Fasteners . 16Section 3. Bolted Parts .3.1. Connected Plies .3.2. Faying Surfaces .3.3. Bolt Holes .3.4. Burrs .1717172125Section 4. Joint Type .4.1. Snug-Tightened Joints .4.2. Pretensioned Joints .4.3. Slip-Critical Joints .26282929Section 5. Limit States in Bolted Joints .5.1. Nominal Shear and Tensile Strengths .5.2. Combined Shear and Tension .5.3. Nominal Bearing Strength at Bolt Holes .5.4. Design Slip Resistance .5.5. Tensile Fatigue .313235363842Section 6. Use of Washers . 446.1. Snug-Tightened Joints . 446.2. Pretensioned Joints and Slip-Critical Joints . 44Section 7. Pre-Installation Verification . 477.1. Tension Calibrator . 477.2. Required Testing . 49Specification for Structural Joints Using High-Strength Bolts, August 1, 2014RESEARCH COUNCIL ON STRUCTURAL CONNECTIONS

16.2-viSection 8. Installation . 518.1. Snug-Tightened Joints . 518.2. Pretensioned Joints and Slip-Critical Joints . 52Section 9. Inspection .9.1. Snug-Tightened Joints .9.2. Pretensioned Joints .9.3. Slip-Critical Joints .60606063Section 10. Arbitration . 64Appendix A. Testing Method to Determine the SlipCoefficient for Coatings Used in Bolted Joints . 66A1. General Provisions . 66A2. Test Plates and Coating of the Specimens . 67A3. Slip Tests . 70A4. Tension Creep Tests . 74References . 77Index . 81Specification for Structural Joints Using High-Strength Bolts, August 1, 2014RESEARCH COUNCIL ON STRUCTURAL CONNECTIONS

16.2-viiSYMBOLSThe following symbols are used in this Specification.AbCross-sectional area based upon the nominal diameter of bolt, in.2DSlip probability factor as described in Section 5.4.2DuMultiplier that reflects the ratio of the mean installed bolt pretension to thespecified minimum bolt pretension, Tm, as described in Section 5.4.1FnNominal strength (per unit area), ksiFuSpecified minimum tensile strength (per unit area), ksiIMoment of inertia of the built-up member about the axis of buckling (seethe Commentary to Section 5.4), in.4LTotal length of the built-up member (see the Commentary to Section 5.4), in.LsLength of a connection measured between extreme bolt hole centers parallelto the line of force (see Table 5.1), in.LcClear distance, in the direction of load, between the edge of the hole and theedge of the adjacent hole or the edge of the material, in.NbNumber of bolts in the jointPuRequired strength in compression, kips; Axial compressive force in thebuilt-up member (see the Commentary to Section 5.4), kipsQFirst moment of area of one component about the axis of buckling of thebuilt-up member (see the Commentary to Section 5.4), in.3RnNominal strength, kipsT