1981_2016.pdf

A M E R I C A N N A T I O N A L S T A N D A R D Wood Screws(INCH SERIES)ANSI B18.6.1-1981 REVISION OF 818.6.1-1972(R1977)REAFFIRMED 1997 FOR CURRENT COMMITEE PERSONNEL PLEASE SEE ASME MANUAL A S 1 1 SECRETARIAT SOCIETY OF AUTOMOTIVE ENGINEERS THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS PUBLISHED BY T H E A M E R I C A N S O C I E T Y O F M E C H A N I C A L E N G I N E E R S United Engineering Center 345 East 47th Street New York,N.Y.1001 7 REAFFIRMED 2016Date of Issuance:February 28,1982 This code or standard was developed under procedures accredited as meeting the criteria for American National Standards.The Consensus Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate.The proposed code or standard was made available for public review and comment which provides an opportunity for additional public input from industry,academia,regulatory agen-cies,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 any items mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent,nor assume any such liability.Users of a code or standard are expressly advised that determination of the validity of any such patent rights,and the risk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representativek)or personk)affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.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.Copyright 0 1982 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A.FOREWORD American National Standards Committee B18 for the standardization of bolts,screws,nuts,rivets and similar fasteners was organized in March 1922,as Sectional Committee B18 under the aegis of the American Engineering Standards Committee(later the American Standards Association,then the United States of America Standards Institute and,as of October 6,1969,the American National Standards Institute,Inc.),with the Society of Automotive Engineers and the American Society of Mechanical Engineers as joint sponsors.Subcommittee 3*was subsequently established and charged with the responsibility for technical content of standards covering slotted and recessed head screws.An American Standard setting forth slotted head proportions was approved and published in April of 1930.Over the years following the issuance of this document,the need for standards more comprehensive than head configurations became apparent.At a meeting held on April 14,1942,Subcommittee 3*was reorgan-ized and enlarged,and the following operating scope was established:The scope of Subcommittee 3*shall consist of the development and promulgation of American Stan-dards embracing screw products variously known as machine screws,wood screws,tapping screws,slotted head cap screws and slotted headless set screws and machine screw nuts.The standards shall comprise complete product standards covering all dimensions and tolerances required for the specification and pro-duction of the products.Details shall include boundary dimensions;such as,nut width and thickness;screw head dimensions;slot and recess dimensions;body dimensions;thread classification or thread detail,as required;thread length;point design;chamfers;underhead fillets;and supporting general specifications covering the quality,finish,and the acceptable tolerances and limits as well as any information that may be necessary to insure satisfactory application of the products.Several meetings of the Subcommittee over the ensuing three years resulted in the development and acceptance of a proposed revision containing complete product standards coverage for slotted and recessed head machine,tapping and wood screws;slotted head and hexagon head cap screws;and slotted headless set screws.Following approval by the B18 Committee and sponsor organizations,this proposal was for-warded to the American Standards Association and declared an Arnericrln Standard,ASA B18.6 on April 12,1947.Recognizing the need for further refinements,Subcommittee 3*at a meeting held on February 1,195 1,established three standing working subgroups:one to develop details pertinent to tapping screw threads;a second to review,revise,and develop head dimensions and tolerances;and a third to correlate and edit the technical information emanating from the other two groups.Also at this meeting,numerous suggested changes were reviewed and assigned to the respective subgroups for further development.Additional meet-ings of the Subcommittee were held on Oct