1、AN AMERICAN NATIONAL STANDARDMetricRound Head Short Square Neck BoltsASME B18.5.2.1M-2006Revision of ASME B18.5.2.1M-1996 (R2003)Intentionally left blank ASME B18.5.2.1M-2006Revision of ASME B18.5.2.1M-1996 (R2003)MetricRound HeadShort SquareNeck BoltsAN AMERICAN NATIONAL STANDARDThree Park Avenue N
2、ew York, NY 10016Date of Issuance: October 2, 2006This Standard will be revised when the Society approves the issuance of a new edition. There willbe no addenda issued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard. Interpreta
3、tions are published on the ASME website under the Committee Pages athttp:/www.asme.org/codes/ as they are issued.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 Natio
4、nalStandards. 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 for public review and comment that provides an opportunity fo
5、r 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 any position with respect to the validity of any patent rights asserted in connectio
6、n 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 assume any such liability. Users of a code or standard are expresslyadvised that determination of the validity of any such
7、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 f
8、or 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
9、 written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2006 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the B18 Committee vi1
10、 Introductory Notes 12 General Data . 2Tables1 Dimensions of Round Head Short Square Neck Bolts . 32 Length Tolerances . 43 Maximum Grip Lengths, Lg, and Minimum Body Lengths, Ls. 54 Thread Lengths 5Nonmandatory AppendicesA Gage and Gaging for Checking Bolt Straightness . 7B Recommended Clearance Ho
11、les for Metric Round Head Short Square Neck Bolts 8iiiFOREWORDASME Standards Committee B18 for the Standardization of Bolts, Nuts, Rivets, Screws, Washers,and Similar Fasteners (formerly American National Standards Committee B18), was originatedin March 1922 as Sectional Committee B18 under the aegi
12、s of the American Engineering StandardsCommittee (later the American Standards Association, the United States of America StandardsInstitute, and, as of October 6, 1969, the American National Standards Institute, Inc.) with theSociety of Automotive Engineers and the American Society of Mechanical Eng
13、ineers as jointsponsors. Subcommittees 2, 5, and 6 (later redesignated Subcommittee 9) were subsequentlyestablished and charged with the responsibilities for the technical content of standards for: externaldrive bolts and nuts, round unslotted head bolts, and plow bolts and nuts, round unslotted hea
14、dbolts, and plow bolts, respectively. Subcommittee 9 was merged into Subcommittee 5 in 1977.In October 1978, drafting of this Standard was started. The draft was circulated for letter ballotof Subcommittee 5 and Committee B18 on March 27, 1980. Following approval by Subcommittee5 and Committee B18,
15、this Standard was approved by the secretariat and submitted to theAmerican National Standards Institute for designation as an American National Standard. Thiswas granted on August 14, 1981.In December 1986, ASME Committee B18 agreed to combine Subcommittee 5 into Subcommittee2, since the products ad
16、dressed by the two Subcommittees were quite similar. Committee B18further agreed the designations of the Subcommittee 2 and 5 documents not be changed, sincesuch changes would adversely affect current references to these Standards.Following approval by Subcommittee 2 and Committee B18, the 1996 edit
17、ion was approvedby the secretariat and submitted to the American National Standards Institute for approval asan American National Standard. This was granted on March 8, 1996.This revision, ASME B18.5.2.1M-2006, was approved by the American National StandardsInstitute on August 4, 2006.ivASME B18 COM
18、MITTEEStandardization of Bolts, Nuts, Rivets, Screws,Washers, and Similar Fasteners(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSD. A. Clever, ChairR. D. Strong, Vice ChairS. W. Vass, Vice ChairR. L. Crane, SecretarySTANDARDS COMM
19、ITTEE PERSONNELJ. B. Belford, Corresponding Member, Lawson Products, Inc.V. Cartina, Aztech LocknutD. A. Clever, Deere and Co.A. P. Cockman, Ford Motor Co.R. L. Crane, The American Society of Mechanical EngineersA. C. DiCola, Wrought Washer Co.B. A. Dusina, Federal Screw WorksJ. S. Foote, Correspond
20、ing Member, Trade AssociationManagement, Inc.D. S. George, Ford Motor Co.J. Greenslade, Corresponding Member, Greenslade and Co.J. J. Grey, Corresponding Member, Fastener Consulting Services,Inc.B. Hasiuk, Corresponding Member, Defense Industrial SupplyCenter PhiladelphiaA. Herskovitz, ConsultantJ.
21、Hubbard, Corresponding Member, Rockford Fastener, Inc.J. Jennings, Corresponding Member, Naval Surface Warfare CenterM. Keller, Corresponding Member, Paracad Technology Co.SUBCOMMITTEE 2 EXTERNAL DRIVE FASTENERSS. W. Vass, Chair, ConsultantR. L. Crane, Secretary, The American Society of MechanicalEn
22、gineersH. S. Brenner, Almay ConsultantsD. A. Clever, Deere and Co.A. P. Cockman, Ford Motor Co.B. A. Dusina, Federal Screw WorksJ. S. Foote, Trade Association Management, Inc.D. S. George, Ford Motor Co.J. Greenslade, Greenslade and Co.A. Herskovitz, ConsultantM. W. Holubecki, Electric Boat Corp.J.
23、Hubbard, Rockford Fastener, Inc.vJ. F. Koehl, Corresponding Member, Spirol International Corp.W. H. Kopke, ITW Shakeproof Assembly ComponentsJ. G. Langenstein, Member Emeritus, ConsultantW. J. Lutkus, Emhart Industrial Heli-CoilD. McCrindle, Canadian Fasteners InstituteM. D. Prasad, Corresponding Me
24、mber, General Motors Corp.J. A. Roley, Corresponding Member, Caterpillar, Inc.W. L. Sakowski, Account Managers, LLCS. Savoji, ITW MedalistW. R. Schevey, Corresponding Member, BGM Fastener Co., Inc.W. R. Stevens, RamcoR. D. Strong, General Motors Corp.S. W. Vass, ConsultantC. B. Wackrow, MNP Corp.W.
25、K. Wilcox, ConsultantC. B. Williamson, Corresponding Member, Fastenal Co.C. J. Wilson, Industrial Fasteners InstituteR. B. Wright, Corresponding Member, Wright Tool Co.J. G. Zeratsky, National Rivet however, theyshould not contain proprietary names or information.Requests that are not in this format
26、 may be rewritten in the appropriate format by 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 might affect an interpretation is available.
27、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 Standards Committee regularly holds meeting
28、s, whichare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B18 Standards Committee.viASME B18.5.2.1M-2006METRIC ROUND HEAD SHORT SQUARE NECK BOLTS1 INTRODUCTORY NOTES1.1 Scope1.1.1 This Standard covers the general and dimen-sional data for metric series
29、round head short squareneck bolts recognized as an American National Standardand intended primarily for applications in thin metals.1.1.2 The inclusion of dimensional data in thisStandard is not intended to imply that all sizes describedare production stock items. Consumers should consultwith suppli
30、ers concerning lists of stock productionitems.1.2 Comparison With ISO 8678:19881.2.1 Steel bolts produced to this Standard arefunctionally interchangeable with bolts which conformto ISO 8678:1988. Differences between this Standard andISO 8678 are: size M14, materials other than steel, andminor varia
31、tions in tolerances, such as, permissibleswell, fin, or die seam on the body of bolts with nominallengths longer than 150 mm. Dimensional require-ments in addition to, or different from ISO 8678, areshown in bold type in this Standard.1.2.2 Letter symbols designating dimensionalcharacteristics are i
32、n accordance with ISO 225 andISO 8678, except where capitals have been used insteadof the lowercase letters used in the ISO standards.1.3 TerminologyFor definitions of terms relating to fasteners or compo-nent features used in this Standard, refer to ASMEB18.12.1.4 Dimensions1.4.1 All dimensions in
33、this Standard are in milli-meters (mm), and apply to unplated or uncoated prod-uct, unless stated otherwise.1.4.2 Symbols specifying geometric characteristicsare in accordance with ASME Y14.5M.1.5 Clearance HolesThe recommended sizes of clearance holes in materi-als to be assembled, using round head
34、 short square neckbolts, are given in Nonmandatory Appendix B.11.6 Designation1.6.1 Round head short square neck bolts are desig-nated by the following data, preferably in the sequenceshown: product name and designation of the standard,nominal diameter and thread pitch, nominal length,steel property
35、 class or material identification, and pro-tective coating, if required.EXAMPLES:Round head short square neck bolt B18.5.2.1M,M10H115471.5H1154750 9.8 - zinc plated per ASTM F 1941M Fe/Zn 5C.Round head short square neck bolt B18.5.2.1.M,M6 H11547 1 H11547 35, stainless steel class C1-50 ASTM F 738M.
36、NOTE: It is common practice in ISO standards to omit threadpitch from product size designations when screw threads are metriccoarse thread series (e.g., M10 is M10 H11547 1.5).1.6.2 For the recommended part number (PIN)system for metric round head short square neck bolts,see ASME B18.24.1.7 Referenc
37、ed StandardsUnless otherwise specified, the standards referencedshall be the most recent issue at the time of order place-ment. The following is a list of publications referencedin this Standard.ASME B1.3M, Screw Thread Gaging Systems forDimensional Acceptability Inch and Metric ScrewThreads (UN, UN
38、R, UNJ, M, and MJ)ASME B1.13M, Metric Screw ThreadsMProfileASME B18.2.8, Clearance Holes for Bolts, Screws, andStudsASME B18.12, Glossary of Terms for MechanicalFastenersASME B18.18.1M, Inspection and Quality Assurance forGeneral Purpose FastenersASME B18.18.2M, Inspection and Quality Assurance forH
39、igh-Volume Machine Assembly FastenersASME B18.18.3M, Inspection and Quality Assurance forSpecial Purpose FastenersASME B18.18.4M, Inspection and Quality Assurance forFasteners for Highly Specialized Engineered Applica-tions MetricASME B18.24, Part Identifying Number (PIN) CodeSystem Standard for B18
40、 Fastener ProductsASME B18.5.2.1M-2006 METRIC ROUND HEAD SHORT SQUARE NECK BOLTSASME Y14.5M, Dimensioning and TolerancingPublisher: The American Society of MechanicalEngineers (ASME), Three Park Avenue, New York,NY 10016-5990; Order Department: 22 Law Drive,P.O. Box 2300, Fairfield, NJ 07007-2300AST
41、M F 468M, Standard Specification for NonferrousBolts, Hex Cap Screws, and Studs for General Use(Metric)ASTM F 568M, Standard Specification for Carbon andAlloy Steel Externally Threaded Metric FastenersASTM F 738M, Standard Specification for Stainless SteelMetric Bolts, Screws, and StudsASTM F 788/F
42、788M, Standard Specification for SurfaceDiscontinuities of Bolts, Screws, and Studs, Inch andMetric SeriesASTM F 1941M, Electrodeposited Coatings on ThreadedFasteners (Metric)Publisher: ASTM International (ASTM), 100 Barr HarborDrive, P.O. Box C700, West Conshohocken, PA19428-2959ISO 225, Fasteners
43、Bolts, Screws, and Studs Sym-bols and Designations of DimensionsISO 8678:1988, Cup Head Square Neck Bolts With SmallHead and Short Neck Product Grade BPublisher: International Organization for Standardiza-tion (ISO), 1 Rue de Varembe , Case Postale 56,CH-1211, Geneve 20 Switzerland/SuisseSAE J1199,
44、Mechanical and Material Requirements forMetric Externally Threaded Steel FastenersPublisher: Society of Automotive Engineers (SAE), 400Commonwealth Drive, Warrendale, PA 15096-00012 GENERAL DATA2.1 Heads2.1.1 Top of Head. The spherical top surface of thehead may be underfilled within a circle equal
45、to thenominal bolt diameter, D, concentric to the bolt axis,providing the head height, K, is maintained.2.1.2 Head Height. The head height is the distance,as measured parallel to the axis of the bolt, from thetop of the head to the underhead bearing surface. Seepara. 2.11.2.1.3 Edge of Head. The edg
46、e of the head may beflat or rounded, and the periphery may be somewhatirregular, providing the limits for head diameter, Dk,bearing surface diameter, Dw, and head edge thickness,C (measured at the minimum bearing surface diameter,Dwmin.), are maintained.2.1.4 Bearing Surface. The bearing surface sha
47、ll bereasonably flat and perpendicular within one degree tothe axis of the bolt. A0.5mmmaximumheightdieseamfin across the bearing surface shall be permissible.22.2 Square Neck2.2.1 Depth of Neck. The depth of the square neckis the distance, measured parallel to the axis, from thebearing surface to t
48、he plane where the corner chamferwould intersect the nominal bolt diameter.2.2.2 Corner Depth. The corner depth is the dis-tance, measured at a corner of the square, from the planeof the bearing surface to the last plane at which thewidth across corners, E, is within its specified limits.2.2.3 Width
49、 Across Corners. The corners of thesquare neck may be rounded or underfilled to the extentallowed by the minimum width across corners, E, andthe minimum corner depth, F1. There may be a fin ordie seam on the corners of the square not to exceedthe maximum width across corners.2.3 FilletsThe radius of fillets at the junction of head and squareneck and at the junction of square neck and shank shallbe within the specified limits, except for bolts producedfromnonferrousandcorrosionresistancematerials,onwhich maximum fillets shall be subject to agreementbetween manufacturer
