1、AN AMERICAN NATIONAL STANDARD ASME B18.5-2012(Revision of ASME B18.5-2008)Round Head Bolts (Inch Series)ASME B18.5-2012(Revision of ASME B18.5-2008)RoundHeadBolts(Inch Series)AN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016 USADate of Issuance: August 13, 2012This Standard will be r
2、evised 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 AS
3、ME 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.
4、 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.This option can be found on the appropriate Committee Page af
5、ter selecting “Errata” in the “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 approve
6、d 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 for public review and comment that provides an opportunity for additional public input from industry, academia,
7、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 do
8、es not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent, nor assume 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 suc
9、h 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 iss
10、ued 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
11、Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2012 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . viCorrespondence With the B18 Committee vii1 Introductory Notes 12 General Data 12Tables1 Di
12、mensions of Round Head Bolts 22 Dimensions of Round Head Square Neck Bolts . 33 Dimensions of Round Head Short Square Neck Bolts . 44 Dimensions of Round Head Ribbed Neck Bolts . 55 Dimensions of Round Head Fin Neck Bolts . 66 Dimensions of Step Bolts 77 Dimensions of Countersunk Bolts and Slotted C
13、ountersunk Bolts . 88 Dimensions of 114-deg Countersunk Square Neck Bolts . 99 Dimensions of Flat Countersunk Head Elevator Bolts . 1010 Dimensions of T-Head Bolts 11Mandatory AppendixI Gaging Length of Square Neck . 15iiiFOREWORDAmerican National Standards Committee B18 for the standardization of b
14、olts, screws, nuts,rivets, and similar fasteners was originated in March 1922 as Sectional Committee B18, underthe aegis of the American Engineering Standards Committee later the American StandardsAssociation, the United States of America Standards Institute, and as of October 6, 1969, theAmerican N
15、ational Standards Institute, Inc. (ANSI), with the Society of Automotive Engineers(SAE) and the American Society of Mechanical Engineers (ASME) as joint sponsors. Subcommittee5 was subsequently established and charged with the responsibility for technical content ofstandards covering round unslotted
16、 head bolts.The initial proposal completed by the Subcommittee in February of 1923 consisted of standardscovering head dimensions for carriage, step, and round head machine bolts. Circulation of theoriginal draft and numerous revisions thereto culminated in a document that was issued as aTentative A
17、merican Standard on February 20, 1928.In 1934, Subcommittee 5 initiated work on a revision of the standard to bring it into linewith altered consumer requirements and refinements in manufacturing technology. A proposalcontaining dimensional changes and additional data was duly approved and issued as
18、 a revisionin 1939.Early in 1947, Subcommittee 5 commenced to conduct an extensive review of the existingdocument and to expand it into a complete product standard. Over the ensuing three years, theSubcommittee developed a proposal incorporating the adoption of a shorter depth of squareneck and the
19、addition of coverage for commonly used elevator bolts and T-head bolts plus around head short square neck bolt used extensively by the farm equipment industry in thinmetals. Subsequent toacceptance by the Subcommittee,the B18 Committee, andsponsor organiza-tions, the proposal was submitted to the Am
20、erican Standards Association for approval anddesignation as an American National Standard. This was granted on March 12, 1952.In 1966, the Subcommittee, recognizing the need for updating the standard, undertook develop-ment of a revision. Numerous meetings and work sessions resulted in Subcommittee
21、acceptanceof a draft incorporating changes to clarify intent and overcome inconsistencies in specificationsand format with related documents. Included were the redimensioning of countersunk typeheads, the adoption of new tolerances on bolt length, the addition of straightness requirements,and the el
22、imination of coverage for ribbed head type elevator bolts. Following letter ballotapproval by the B18 Standards Committee and the sponsor organizations, the revision wassubmitted to ANSI and was designated an American National Standard on January 20, 1971.In 1977, the Subcommittee again recognized t
23、he need for a revision. Following letter ballotapproval by the B18 Standards Committee, the revision was approved by the Secretariat andANSI on September 8, 1978.The B18 Committee began a revision in 1984 to upgrade the standard to include informationon identification symbols and to add quality assu
24、rance provisions.In December 1986, the ASME B18 Committee agreed to combine Subcommittee 5 intoSubcommittee 2, since the product lines each Subcommittee addresses are quite similar.The B18 Committee further agreed the designation of the Subcommittee 2 and 5 documentsnot be changed, since this would
25、adversely affect current reference to these Standards.Following approval by the B18 Committee, the previous edition was approved by ANSI onDecember 27, 1990.AreaffirmationofthisStandardwasballotedandapprovedbytheB18StandardsCommitteeandB18 Subcommittee 2 on December 27, 2007.The revision, ASME B18.5
26、-2008, was approved by the American National Standards Instituteon March 27, 2008.The B18 Committee undertook a revision of ASME B18.5 in 2011 at the request of severalparties to improve the detail to which the square necks on various bolts covered by this Standardare specified and inspected. Dimens
27、ions for square length and minimum across corner dimensionsivwere added and a recommended square neck gaging method was added in a mandatory appendix.Various other minor changes were made to the standard to make it compatible with recent formatchanges adopted for all B18 standards.Suggestions for im
28、provement of this Standard are welcome. They should be addressed to theSecretary, ASME B18 Standards Committee, Three Park Avenue, New York, NY 10016-5990.This revision, ASME B18.5-2012, was approved by ANSI on July 3, 2012.vASME B18 COMMITTEEStandardization of Bolts, Nuts, Rivets, Screws,Washers, a
29、nd Similar Fasteners(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSJ. Greenslade, ChairD. S. George, Vice ChairW. H. King, Vice ChairC. J. Gomez, SecretarySTANDARDS COMMITTEE PERSONNELV. Cartina, Autocraft IndustrialD. A. Clever, C
30、ontributing Member, ConsultantA. P. Cockman, Ford Motor Co.C. D. de la Garza, TSP, Inc.D. S. George, Ramco SpecialtiesC. J. Gomez, The American Society of Mechanical EngineersJ. Greenslade, Industrial Fasteners InstituteJ. J. Grey, Contributing Member, Fastener Consulting Services, Inc.A. Herskovitz
31、, Contributing Member, ConsultantJ. Hubbard, Leland-Powell Fasteners, Inc.J. C. Jennings, Contributing Member, Naval Surface Warfare CenterW. H. King, Porteous Fastener Co.SUBCOMMITTEE 2 EXTERNALLY DRIVEN FASTENERSJ. Greenslade, Chair, Industrial Fasteners InstituteC. B. Williamson, Vice Chair, Fast
32、enal Co.T. Anderson, Bay BoltV. Cartina, Autocraft IndustrialL. Claus, ATF, Inc.A. P. Cockman, Ford Motor Co.C. D. de la Garza, TSP, Inc.B. A. Dusina, Federal Screw WorksM. A. Elmi, ConsultantJ. S. Foote, Trade Association Management, Inc.M. C. Friel, Haydon Bolts, Inc.D. S. George, Ramco Specialtie
33、sA. Herskovitz, ConsultantM. W. Holubecki, Electric Boat Corp.J. Hubbard, Leland-Powell Fasteners, Inc.J. C. Jennings, Contributing Member, Naval Surface Warfare CenterW. H. King, Porteous Fastener Co.viM. D. Prasad, Contributing Member, GlobalM however, they shouldnot contain proprietary names or i
34、nformation.Requests that arenot in this format may berewritten in the appropriate formatby the Committeeprior to being answered, which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additionalinformation that m
35、ight affect an interpretation is available. Further, persons aggrieved by aninterpretation 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 B18
36、 Standards Committee regularly holds meetings, whichare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B18 Standards Committee.viiINTENTIONALLY LEFT BLANKviiiASME B18.5-2012ROUND HEAD BOLTS (INCH SERIES)1 INTRODUCTORY NOTES1.1 Scope1.1.1 This Standard co
37、vers the complete generaland dimensional data for the various types of inch seriesbolts generally classified as round head bolts and recog-nized as American National Standard.1.1.2 The inclusion of dimensional data in thisStandard is not intended to imply that all of the productsdescribed are stock
38、production sizes. Consumers shouldconsult with manufacturers concerning availability ofproducts.1.2 Bolt TypesThe bolt types covered by this Standard are enumer-ated and described in paras. 1.2.1 through 1.2.10.1.2.1 Round Head Bolt (Formerly Designated ButtonHead Bolt). The round head bolt shall ha
39、ve a circularhead with a low rounded top surface and a flat bearingsurface. Dimensions are given in Table 1.1.2.2 Round Head Square Neck Bolt (FormerlyDesignated Round Head Carriage Bolt). The round headsquare neck bolt shall have a circular head with a lowrounded top surface and a flat bearing surf
40、ace, and anintegrally formed square neck under the head.Dimensions are given in Table 2.1.2.3 Round Head Short Square Neck Bolt. Theround head short square neck bolt shall have a circularhead with a low rounded top surface and a flat bearingsurface, and an integrally formed short length squareneck u
41、nder the head. Dimensions are given in Table 3.1.2.4 Round Head Ribbed Neck Bolt (FormerlyDesignated Ribbed Neck Carriage Bolt). Theround headribbed neck bolt shall have a circular head with a lowrounded top surface and a flat bearing surface, and aribbed or splined neck formed on the shank below th
42、ehead. Dimensions are given in Table 4.1.2.5 Round Head Fin Neck Bolt (Formerly DesignatedFin Neck Carriage Bolt). The round head fin neck boltshallhaveacircularheadwithalowroundedtopsurfaceand a flat bearing surface, and two diametrically oppo-site integrally formed fins at the junction of head wit
43、hshank. Dimensions are given in Table 5.1.2.6 Step Bolt. The step bolt shall have a largecircular head with a low rounded top surface and a flat1bearing surface, and an integrally formed square neckunder the head. Dimensions are given in Table 6.1.2.7 Countersunk and Slotted Countersunk Bolts.The co
44、untersunk bolt shall have a circular head with aflat top surface and a conical bearing surface having ahead angle of approximately 80 deg. Countersunk boltsare available with and without a slot in the head, asspecified by the purchaser. Dimensions are given inTable 7.1.2.8 114-deg Countersunk Square
45、 Neck Bolt(Formerly Designated Countersunk Carriage Bolt). The114-deg countersunk square neck bolt shall have a circu-lar head with a flat top surface and a conical bearingsurface having a head angle of approximately 114 deg,and an integrally formed square neck under the head.Dimensions are given in
46、 Table 8.1.2.9 Flat Countersunk Head Elevator Bolt. The flatcountersunkheadelevatorboltshallhavealargecircularheadwithaflattopsurfaceandashallowconicalbearingsurface, and an integrally formed square neck under thehead. Dimensions are given in Table 9.1.2.10 T-Head Bolt. The T-head bolt shall have ar
47、ectangular head with a rounded top surface and a flatbearing surface. Dimensions are given in Table 10.1.3 TerminologyFordefinitionsoftermsrelatingtofastenersorcompo-nent features thereof used in this Standard, refer toASME B18.12.1.4 DimensionsAll dimensions in this Standard are given in inches,unl
48、ess otherwise stated.1.5 DesignationRound head bolts are designated by the followingdata, preferably in the sequence shown:(a) product name and designation of the standard(b) nominal diameter, threads per inch, and nominallength(c) material grade or identification, and protectivecoating, if required
49、EXAMPLES:(1) Round headshort square neckbolt ASMEB18.5,38-16H115473, steelASTM A307, Grade A, zinc plated ASTM F1941, Fe/Zn 3A.(2) Step bolt ASME B18.5,12-13 H11547 4, stainless steel, ASTM F593alloy group 1.ASME B18.5-2012Table 1 Dimensions of Round Head BoltsR AE H LT L See para. 2.6.2Maximum FilletBody Diameter, E Head Diameter, A Head Height, HNominal Size or Basic Radius, RBolt Diameter Max. Min. Max. Min. Max. Min. Note (1)No. 10 0.1900 0.199 0.182 0.469 0.438 0.114 0.094 0.031140.2500 0.260 0.237 0.594 0.563 0.145 0.125 0.0315160.3125 0.324 0.298 0.719 0.688 0.176 0.15
