ASME_B18.3-2012.pdf

AN AMERICAN NATIONAL STANDARD ASME B18.3-2012Revision of ASME B18.3-2003(R2008)Socket Cap,Shoulder,Set Screws,and Hex Keys(Inch Series)Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B18.3-2012Revision of ASME B18.3-2003(R2008)Socket Cap,Shoulder,SetScrews,andHex Keys(Inch Series)AN AMERICAN NATIONAL STANDARDTwo Park Avenue New York,NY 10016 USACopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Date of Issuance:April 24,2013This 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.Cases and 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 ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-CONTENTSForeword.ivCommittee Roster.viCorrespondence With the B18 Committee.vii1Introductory Notes.12General Data.2Figure1Cup Point Variations.37Tables1Dimensions of Hexagon Socket Head Cap Screws.32Dimensions of Under Head Fillets for Socket Head Cap Screws Threadedto the Head.63Dimensions of Under Head Fillets for Socket Head Cap Screws With anUnthreaded Length of Body Diameter.74Body and Grip Lengths for Socket Head Cap Screws.85Lengths Beyond Sizes in Table 4.126Shank Straightness for Socket Head Cap Screws.137Dimensions of Drilled Hexagon Socket Head Cap Screws.148Dimensions of Hexagon Socket Flat Countersunk HeadCap Screws.169Body and Grip Lengths for Socket Flat Countersunk Head Cap Screws.1910Lengths Beyond Sizes in Table 9.2211Dimensions of Hexagon Socket Button Head Cap Screws.2312Dimensions of Low Head Hexagon Socket Cap Screws.2613Dimensions of Hexagon Socket Head Shoulder Screws.2814Dimensions of Hexagon Socket Set Screws.3115Hexagon Key Engagements for Short Length Set Screws.3516Dimensions of Optional Cup Points.3617Dimensions of Hexagon Keys and Bits.3818Dimensions of Hexagon Sockets.40Mandatory AppendicesIGages and Gaging for Hexagon Sockets.41IIProtrusion Gaging of Flat Counters