1、 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-The American Society of Mechanical Engineers THREAD FORMING AND THREAD INTTINC TAPPINC SCREWS AND METAlllG DRIVE SCREWS (INtH SERIES) ASME B1 8.6.4-1
2、998 Revision 01 ANSI B18.6.4-1981 (R1997) Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-m 0759b70 Ob14708 bT5 m Date of Issuance: December 31, 1999 The 1998 edition of this Standard is being issued
3、 with an automatic addenda subscription service. The use of an addenda allows revisions made in response to public review comments or committee actions to be published as necessary. The next edition of this Standard is scheduled for publication in 2003. ASME issues written replies to inquiries conce
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5、eveloped under procedures accredited as meeting the criteria for American National Standards. The Standards 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 standar
6、d was made available for public review and comment that provides an opportunity for additional public input 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
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10、ay 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 Engineers Three Park Avenue, New York, NY 10016-5990 Copyright Q 1999 by All Rights Reserved Printed in U.S.A. THE AMERICAN SOCIETY
11、OF MECHANICAL ENGINEERS Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-American National Standards Committee BI 8 for the standardization of bolts, screws, nuts, rivets, and similar fasteners was or
12、ganized in March 1922, as Sectional Committee BI8 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 So
13、ciety 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 h
14、ead 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 reorganized and enlarged, and the following
15、 operating scope was established: The scope of Subcommittee 3 shall consist of the development and promulgation of American Standards embracing screw products variously known as machine screws, wood screws, tapping screws, slotted head cap screws and slotted headless set screws and machine screw nut
16、s. The standards shall comprise complete product standards covering all dimensions and tolerances required for the specification and production of the products. Details shall include boundary dimensions; such as nut width and thickness; screw head dimensions; slot and recess dimensions; body dimensi
17、ons; 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 app
18、lication of the products. Several meetings of the Subcommittee over the ensuing 3 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 s
19、crews; and slotted headless set screws. Following approval by the B18 Committee and sponsor organizations, this proposal was forwarded to the American Standards Association and declared an American Standard, ASA B 18.6 on April 12, 1947. Recognizing the need for further refinements, Subcommittee 3 a
20、t a meeting held on February I, 1951, 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
21、two groups. Also at this meeting, numerous suggested changes were reviewed and assigned to the respective subgroups for further development. Additional meetings of the Subcommittee were held on October 9, 1952, October 29, 1953, and April I and 2, 1954. Between each of these meetings the subgroups h
22、eld numerous working sessions and carried on technical development in cooperation with the technical committees of the U.S. Machine Screw and Tapping Screw Service Bureaus. As of April 1, 1966, Subcommittee 3 was redesignated Subcommittee 6. 111 . Copyright ASME International Provided by IHS under l
23、icense with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-At the April 1954 meeting, Subcommittee 3, contemplating a partial revision of the ASA B 18.6 document, recommended the publication of standards for wood screws, cap and set screws, machine screws, and t
24、apping and drive screws in four separate documents each of which would consist of a complete product specification. This approach was confirmed by the BI8 Committee with the further stipulation that the coverage for hexagon head cap screws, square head set screws and machine screw nuts from the ASA
25、B18.2 standard be transferred to the documents covering cap and set screws and machine screws, respectively. It was understood that jurisdiction over the square head set screws and hexagon head cap screws would remain with Subcommittee 2 and that Subcommittee 3 would retain responsibility for machin
26、e screw nuts. Following this confirmation and additional direction, the preparation of proposals for the new documents was undertaken. The proposed standard covering slotted and recessed head tapping screws and metallic drive screws was approved by Subcommittee 3 and after being circulated to indust
27、ry for comment, it was revised, and subsequently approved by letter ballot of Sectional Committee B18. The standard was approved by the sponsor organizations and the American Standards Association and formally designated an American Standard on June 4, 1958. Following issuance of the 1958 standard,
28、Subcommittee 3 and the three subgroups continued to work on revision and refinement of the specifications for tapping screws. Numerous meetings held over several years culminated in a draft proposal incorporating revisions consisting mainly of the following: Inclusion of coverage for Type AB tapping
29、 screws, 100 deg flat head for some screw types, across comers gaging of hex heads, dimensions of large hex heads for Sems, and factors for determining grip lengths on pointed screws; refinement of thread lengths, materials, performance requirements and editorial format; and de-emphasis of round hea
30、ds and Type A tapping screws. This draft was accepted in principle by Subcommittee 3 at a meeting held on September 29 and 30, 1964, with further recommendations to include coverage for the Type 1A cross recess and wobble gaging of recessed heads, and to delete the coverage for Type BG tapping screw
31、s. A second draft incorporating these recommendations was approved by Subcommittee 3 at a meeting held on June 22 and 23, 1965. Subsequent to its approval by letter ballot of the Sectional Committee and the sponsor organizations, the revision was submitted to the USA Standards Institute (the reconst
32、ituted American Standards Association as of August 1966) and was designated a USA Standard on December 2, 1966. Following publication of the 1966 document, Subcommittee 6 and the subgroups thereof continued to pursue the study and development of further simplifications and refinements to the standar
33、d for tapping screws. Numerous meetings held over the ensuing years resulted in committee acceptance of a proposed revision encompassing a more definitive title; significant changes to the specifications for points; more realistic minimum practical screw lengths; changes and clarifications to thread
34、 length specifications; extension of size coverages where applicable for consistency; corrections to recess dimensional data; addition of an appendix covering wrench openings for hex head screws; relegation of the coverage for the Type C point and the truss, 100 deg flat countersunk, slotted hex and
35、 slotted hex washer head styles to the appendices; and numerous editorial corrections and format changes. This revision was duly accepted by letter ballot of Subcommittee 6. Following its approval by letter ballot of the B 18 Committee and the sponsor organizations the revision was submitted to the
36、American National Standards Institute for recognition as an American National Standard. This was granted on June 18, 1981. In 1995 Subcommittee 6 initiated work to revise the point diameters, head diameters for flat head screws, length measurement method for oval head screws, and method of measuring
37、 thread distance from the underside of the head. Additions proposed included adding protrusion height inspection for oval head screws, ductility testing, hydrogen embrittlement testing, iv Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking
38、 permitted without license from IHS-,-and quality assurance and designated inspection characteristics. Several drafts were prepared which resulted in further refinements. These changes were balloted and approved by the ASME B18 Committee. The proposal was submitted to the American National Standards
39、 Institute and designated an American National Standard on June 22, 1998. V Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-ASME B18 STANDARDS COMMITTEE Standardization of Bolts, Nuts, Rivets, Screws
40、, Washers, and Similar Fasteners (The following is the roster of the Committee at the time of approval of this Standard.) OFFICERS D. A. Clever, Chair R. D. Strong, Vice Chair S. W. Vass, Vice Chair R. L. Crane, Secretary COMMllTEE PERSONNEL J. C. Akins, Safety Socket Screw Corp. J. Altman, Rotor Cl
41、ip Co. J. H. Slass, Alternate, Rotor Clip Co. J. B. Belford, Lawson Products, Inc. D. Broomfield, Illinois Tool Works, Inc. J. A. Buda. SPS Technologies D. A. Clever, Deere and Co. T. Collier, Cam-Tech Industries, Inc. R. L. Crane, The American Society of Mechanical Engineers A. C. DiCola, Wrought W
42、asher Co. A. Dinh, Defense Industrial Supply Center W. D. Downing, Consultant B. A. Dusina, Federal Screw Works D. S. George, Ford Motor Co. D. L. Drobnich, Alternate, Ford Motor Co. J. Greenslade, Greenslade however, they should not contain proprietary names or information. Requests which are not i
43、n this format will be rewritten in this format by the Committee prior to being answered, which may inadvertently change the intent of the original request. ASME procedures provide for reconsideration of any interpretation when or if additional information that might affect an interpretation is avail
44、able. Further, persons aggrieved by an interpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity. Attending Committee Meetings. The BIS Main Committee regularly holds mee
45、tings, which are open to the public. Persons wishing to attend any meeting should contact the Secretary of the BI 8 Main Committee. ix Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-D 0757670 Ob1471
46、5 835 = CONTENTS . Foreword 111 Standards Committee Roster . vii Correspondence With B I8 Committee ix Type Designations for Tapping Screws and Metallic Drive Screws xv 1 Introductory Notes . 1 1.1 Scope . 1 I . 2 Tapping Screw Head Types . 1 1.3 Screw Types and Application . 2 1.4 Assembly Consider
47、ations 3 1.5 Dimensions 3 1.6 Options 3 1.7 Responsibility for Modification 3 1.9 Related Standards 3 1.8 Terminology . 3 1.10 Designation 3 1.11 Comparison With IS0 4 I . 12 Referenced Standards . 4 1 . 13 Inspection and Quality Assurance . 4 2 General Data for Tapping Screws 4 2 .I Heads . 4 2.2 L
48、ength . 5 2.3 Threads and Points . 6 2.4 Length of Thread 6 2.5 Diameter of Body 6 2.6 Material and Heat Treatment 7 2.7 Finishes 7 2.8 Workmanship 8 2.9 Performance Requirements and Tests 8 3 General Data for Metallic Drive Screws . 11 3.1 Heads . 11 3.2 Length . 11 3.3 Threads 11 3.4 Points . 1 1
49、3.5 Length of Thread 11 3.6 Material and Heat Treatment 12 3.7 Finishes 12 3.9 Performance Requirements and Tests 12 3.8 Workmanship 12 xi Previous page Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-Figures I Types AB. A. B. BF. BP. and BT . 6 2 Types C. D. G. and T . n. 9 3 Type F 4 Typical Torsional Stre
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