2010_2017.pdf

AN AMERICAN NATIO NAL STANDARDASME B18.6.8-2010Thumb Screws and Wing Screws(Inch Series)REAFFIRMED 2017INTENTIONALLY LEFT BLANKASME B18.6.8-2010Thumb Screwsand Wing Screws(Inch Series)AN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016 USADate of Issuance:November 17,2010This Standard will be revised when the Society approves the issuance of a new edition.There willbe no addenda issued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.Periodically,certain actions of the ASME B18 Committee may be published as Cases.Casesand interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org as they are issued.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards.The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailable forpublic review andcomment thatprovides an opportunityfor additional publicinput from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“rate,”or“endorse”any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent,nor assume any such liability.Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies,which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2010 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.ACONTENTSForeword.ivCommittee Roster.vCorrespondence With the B18 Committee.vi1Introductory Notes.12General Data.2Tables1Dimensions of Type A,Regular Thumb Screws.42Dimensions of Type A,Heavy Thumb Screws.53Dimensions of Type B,Regular Thumb Screws.64Dimensions of Type B,Heavy Thumb Screws.75Dimensions of Type A,Wing Screws.86Dimensions of Type B,Style 1 Wing Screws.97Dimensions of Type B,Style 2 Wing Screws.108Dimensions of Type C,Style 1 Wing Screws.119Dimensions of Type C,Style 2 Wing Screws.1210Dimensions of Type D,Wing Screws.1311Length Increments.1412Length Tolerances.1413Thread Length.1414Dimensions of Alternate Styles of Points for Thumb and Wing Screws.1515Type and Style Designations of Thumb Screws and Wing Screws.16iiiFOREWORDDevelopmentof thisStandardbegan in2004and wascompletedin 2009byB18 Subcommittee6.This Standard was originally published by the Industrial Fasteners Institute(IFI)as IFI-156 in2002.IFI agreed to participate in the conversion of this Standard from an IFI standard to anASME standard.Since the completion of this ASME Standard,IFI-156 has been withdrawn fromcirculation.ASME B18.6.8 is the only standard covering the inch series for thumb and wingscrews.This Standard was approved by the ASME B18 Committee in December of 2009,and wasapproved by the American National Standards Institute on March 24,2010.ivASME B18 COMMITTEEStandardization of Bolts,Nuts,Rivets,Screws,Washers,and Similar Fasteners(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSJ.Greenslade,ChairD.S.George,Vice ChairR.D.Strong,Vice ChairC.J.Gomez,SecretarySTANDARDS COMMITTEE PERSONNELV.Cartina,Autocraft IndustrialD.A.Clever,ConsultantP.Cockman,Ford Motor Co.C.A.Dugal,Texas Screw ProductsD.S.George,ND IndustriesC.J.Gomez,The American Society of Mechanical EngineersJ.Greenslade,Industrial Fasteners InstituteJ.J.Grey,Contributing Member,Fastener Consulting Services,Inc.B.Hasiuk,Contributing Member,Defense Supply CenterPhiladelphiaA.Herskovitz,ConsultantJ.Hubbard,Leland-Powell Fasteners,Inc.J.Jennings,Contributing Member,Naval Surface Warfare CenterW.H.King,Porteous Fastener Co.J.F.Koehl,Contributing Member,Spirol International Corp.SUBCOMMITTEE 6 SLOTTED AND RECESSED HEAD SCREWSR.D.Strong,Chair,ConsultantJ.Hubbard,Vice Chair,Leland-Powell Fasteners,Inc.G.M.Simpson,Vice Chair,Semblex Corp.A.L.Guz