1、AMERICAN NATIONAL STANDARD 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 AS1 1 SECRETARIAT SOCIETY OF AUTOMOTIVE ENGINEERS THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS PUBLISHED BY THE AMERICAN SOC
2、IETY OF MECHANICAL ENGINEERS United Engineering Center 345 East 47th Street New York, N. Y. 1001 7 Date 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 co
3、de 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, regu
4、latory 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 d
5、oes 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
6、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 r
7、etrieval 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 si
8、milar 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 Institu
9、te, 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
10、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 e
11、nlarged, 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
12、 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
13、 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 nece
14、ssary 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;
15、 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 fo
16、r 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 techni
17、cal 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 October 9, 1952; October 29, 1953 and April 1 and 2, 1954. Be-
18、tween each of these meetings the subgroups held 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. At the April 1954 meeting, Subcommittee 3*, contemplating a partial revision of the
19、 ASA B18.6 docu- ment, recommended the publication of standards for wood screws, cap and set screws, machine screws, and tapping and drive screws in four separate documents each of which would consist of a complete product specification. This approach was confirmed by the B18 Committee with the furt
20、her stipulation that the coverage for hexagon head cap screws, square head set screws and machine screw nuts from the ASA 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
21、and hexagon head cap screws would re- main with Subcommittee 2 and that Subcommittee 3* would retain responsibility for machine screw nuts. Following this confirmation and additional direction, the preparation of proposals for the new documents was undertaken. *As of April 1, 1966; Subcommittee 3 wa
22、s redesignated Subcommittee 6 iii The proposed standard covering slotted and recessed head wood screws, revised to incorporate the penetration gaging for recessed heads, was approved by letter ballot of the B18 Committee on March 3 1, 1955. Following its acceptance by the sponsor organizations, the
23、proposal was submitted to the American Standards Association for approval and adoption. Designation as American Standard, ASA B18.6.1, was granted on March 1, 1956. A proposed revision to the document containing numerous changes and corrections to the dimensional data was approved by letter ballot o
24、f the B18 Committee dated April 19, 1957. This proposal, after being rearranged for appearance and consistency with other B18 documents by the editing subgroup, was subsequently approved by the sponsors and the American Standards Association and was officially recognized as an American Standard on O
25、ctober 11, 1961. A revised standard, embodying the inclusion of Type IA cross recess data and wobble gaging of recessed heads in addition to a complete revamping of the format, was completed in October of 1969 by Subcommittee 6. This proposal was duly approved by letter ballot of the B18 Committee a
26、nd sponsor organizations and submitted to the American National Standards Institute. It was designated as American National Standard on January 28, 1972. In 1977, Subcommittee 6 authorized revision of the standard to include dimensional data for rolled thread product and pan heads. After study of in
27、itial drafts at later meetings, it was further agreed that, in the interest of simplification, the head dimensions for the No. 14, No. 18 and No. 24 size wood screws should be made to agree with the corresponding 114, 511 6 and 318 in. size tapping screw heads, respectively; and that the coverage fo
28、r round heads should be deprecated by relegation without change to the appendix. A draft proposal incorporating all of the foregoing recommendations was accepted by the subcommittee and subsequently approved by letter ballot of the B18 Committee. Following its acceptance by the sponsor organizations
29、 this document was submitted to the American National Standards Institute and was granted American National Standard status on November 23, 1981. iv AMERICAN NATIONAL STANDARDS COMMITTEE B18 STANDARDIZATION OF BOLTS, NUTS, RIVETS; SCREWS WASHERS AND SIMILAR FASTENERS OFFICERS J. B. Levy, Chairman E.
30、 Schwartz. Vice Chairman H. W. Ellison, Vice Chairman Richard McGinnis, Secretary COMMITTEE PERSONNEL AMERICAN CHAIN ASSOCIATION L. E. Hampel, Moline Malleable Iron Company, St. Charles, Illinois AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS E. R. Friesth, Coal Valley, Illinois AMERICAN SOCIETY OF MECH
31、ANICAL ENGINEERS, THE A. R. Machell, Jr., Xerox Corporation, Rochester, New York C. R. Adams, Alternate, Newport News Shipbuilding documentation for screw head types relegated to non-preferred status; and formulas on which dimensional data are based. It shall be understood, however, that where quest
32、ions arise concerning acceptance of product, the dimensions given in the tables shall govern over recalculation by formula. 1.1.2 The inclusion of dimensional data in this standard is not intended to imply that all of the products described are stock production sizes. Consumers should consult with m
33、anufac- turers concerning the availability of products. 1.2 Head Types The head types covered by this standard and the appendices include those commonly recognized as being applicable to wood screws and are enu- merated and described in the following: 1.2.1 Flat Countersunk Head. The flat counter- s
34、unk head shall have a flat top surface and a conical bearing surface with a head angle of approximately 82 deg. Dimensions are given in Tables 2 through 5. 1.2.2 Oval Countersunk Head. The oval coun- tersunk head shall have a rounded top surface and a conical bearing surface with a head angle of app
35、roximately 82 deg. Dimensions are given in Tables 6 through 9. 1.2.3 Pan Head. The slotted pan head shall have a flat or slightly rounded top surface rounding into cylindrical sides and a flat bearing surface. The recessed pan head shall have a rounded top surface blending into cylindrical sides and
36、 a flat bearing surface. Bmensions are given in Tables 10 through 13. 1.2.4 Round Head. The round head shall have a semielliptical top surface and a flat bearing sur- face. In recognition of superior slot driving character- istics of pan head screws and the overlap in the dimensions of cross recesse
37、d pan heads and round heads, it is recommended that round heads be designated as non-preferred and replaced by pan heads in new applications. Dimensions for round heads are documented in Appendix IV. 1.3 Dimensions All dimensions in this standard are given in inches, unless stated otherwise. 1.4 Opt
38、ions Options, where specified, shall be at the discre- tion of the manufacturer unless otherwise agreed upon by the manufacturer and the purchaser. 1.5 Terminology For definitions of terms relating to fasteners or component features thereof used in this standard, refer to American National Standard,
39、 Glossary of Terms for Mechanical Fasteners, ANSI B18.12. 1.6 Related Standards It should be noted that standards for machine screws, cap and set screws, tapping screws, drive screws, washers and other related fasteners are published under separate cover as listed on the back sheet of this standard.
40、 1.7 Designation Wood screws shall be designated by the following data in the sequence shown: Nominal size (number or decimal equivalent); product name, including head style and driving provision (slotted or recessed by type of recess); material; and protective or decora- tive finish, if required. S
41、ee examples below: 10 x 1 1 /2 Slotted Flat Countersunk Head Wood Screw, Steel .164 x .75 Type 1 Cross Recessed Pan Head Wood Screw, Brass, Chromium Plated Since screws may be furnished with either cut or rolled threads, unless designated otherwise, users having a specific preference should so indic
42、ate by adding “Cut Threaded” or “Roll Threaded” at end of the normal designation as depicted in the follow- ing example: 10 x 1 1/4 Slotted Oval Countersunk Head Wood Screw, Steel, Zinc Plated, Cut Threaded 1 AMERICAN NATIONAL STANDARD WOOD SCREWS IINCH SERIES) ANSI 618.6.1-1981 2 GENERAL DATA 2.1 H
43、eads 2.1.1 Head Height. All dimensions pertaining to head height specified in the dimensional tables shall be measured parallel to the axis of screw and those relating to the top of head shall represent a metal to metal measurement. In other words, any truncation of rounded head contours due to the
44、slot or recess shall not be considered part of the head height. Total or overall head heights shall be measured from the top of the head to the plane of the bearing surface for pan and round heads, and to the junc- tion of the conical bearing surface with the basic screw diameter for flat or oval co
45、untersunk heads. Head side heiglnt shall be measured from the intersection of the top surface of head with the head diameter to the junction of the conical bear- ing surface with the basic screw diameter for oval countersunk heads. On countersunk heads, the junction of conical bearing surface with t
46、he basic screw diameter may not necessarily be the same as the actual junction of head with shank and the head height delinea- ting the conical bearing surface is a reference dimension. 2.1.2 Depth abf Recess. The depth of recess in recessed head screws shall be measured, parallel to the axis of scr
47、ew, from the intersection of the maximum diameter of the recess with the head surface to the bottom of the recess. Recess penetration gaging depth values are in- cluded in the respective dimensional tables and the method of gaging and specifications for gages are covered in Appendix I. Recess wobble
48、 gages, gaging procedures and permissible limits are given in Appendix 11. 2.1.3 Depth of Slot. The depth of slot in slotted head screw shall be measured, parallel to the axis of screw, from the top of the head to the intersection of the bottom of the slot with the head surface or the bearing surfac
49、e. The bottom of slot over the length of the slot shall be flat to concave within the depth of an arc produced by a 1.0 in. minimum radius. The sides of the slot shall not be tapered or rounded to such an extent that driveability is affected. 2.1.4 Feature Positional Tolerances. The posi- tional relationship of the heads and driving pro- visions of screws with respect to the shanks of screws (formerly defined as eccentricity) shall be as follows: 2.1.4.1 True Position of Head. The axis of the head shall be located at true position relative to the axis of the screw shank within a tolerance z
