ASME_B18.6.3-2013.pdf

Machine Screws,Tapping Screws,and Metallic Drive Screws(Inch Series)AN AM E R IC AN NAT IO NAL STANDARDASME B18.6.3-2013(Revision of ASME B18.6.3-2010)Copyright 2013 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyright 2013 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cASME B18.6.3-2013(Revision of ASME B18.6.3-2010)Machine Screws,Tapping Screws,andMetallic Drive Screws(Inch Series)AN AMERICAN NATIONAL STANDARDTwo Park Avenue New York,NY 10016 USACopyright 2013 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cDate of Issuance:October 11,2013This Standard will be revised when the Society approves the issuance of a new 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.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages toprovide corrections to incorrectly published items,or to correct typographical or grammatical errorsin codes and standards.Such errata shall be used on the date posted.The Committee Pages can be found at http:/cstools.asme.org/.There is an option available toautomatically receive an e-mail notification when errata are posted to a particular code or standard.ThisoptioncanbefoundontheappropriateCommitteePageafterselecting“Errata”inthe“PublicationInformation”section.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 assumes 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 EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2013 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright 2013 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCONTENTSForeword.vCommittee Roster.viiCorrespondence With the B18 Committee.viiiSummary of Changes.ix1Introductory Notes.12General Data for Machine Screw and Tapping Screw Heads.23General Data for Machine Screws.34General Data for Tapping Screws.55General Data for Metallic Drive Screws.8Figures1Types A,AB,B,BF,BP,and BT.92Types C,D,G,T,and TRS.93Type F.94Typical Torsional Strength Test Fixture.10Tables1Dimensions of Slotted Flat Countersunk Head Screws.112Recess Dimensions for Flat Countersunk Head Screws.133Dimensions of Slotted 100-deg Flat Countersunk Head Screws(Machine ScrewsOnly).154Recess Dimensions for 100-deg Flat Countersunk Head Screws(Machine ScrewsOnly).165Dimensions of Slotted Close Tolerance 100-deg Flat Countersunk Head Screws(Machine Screws Only).176Recess Dimensions for Close Tolerance 100-deg Flat Countersunk Head Screws(Machine Screws Only).187Dimensions of Slotted Oval Countersunk Head Screws.198Recess Dimensions of Oval Countersunk Head Screws.219Dimensions of Slotted Undercut 82-deg Flat Countersunk Head Screws.2310Recess Dimensions for Undercut 82-deg Flat Countersunk Head Screws.2411Dimensions of Slotted Undercut Oval Countersunk Head Screws.2512Recess Dimensions for Undercut Oval 82-de