1、AN AMERICAN NATIONAL STANDARDASME B18.16M-2004Prevailing-Torque Type Steel MetricHex Nuts and Hex Flange NutsRevision and Consolidation of ASME B18.16.1M, B18.16.2M,and B18.16.3MIntentionally left blank ASME B18.16M-2004Prevailing-Torque TypeSteel Metric Hex Nuts andHex Flange NutsRevision and Conso
2、lidation of ASME B18.16.1M, B18.16.2M, and B18.16.3MThree Park Avenue New York, NY 10016AN AMERICAN NATIONAL STANDARDDate of Issuance: May 13, 2005This Standard will be revised when the Society approves the issuance of a new edition. There will beno addenda issued to this edition.ASME issues written
3、 replies to inquiries concerning interpretation of technical aspects of this Standard. In-terpretations are published on the ASME Web site under the Committee Pages at http:/www.asme.org/codesas they are issued.ASME is the registered trademark of The American Society of Mechanical Engineers.This cod
4、e or standard was developed under procedures accredited as meeting the criteria for American National Stan-dards. The Standards Committee that approved the code or standard was balanced to assure that individuals from com-petent and concerned interests have had an opportunity to participate. The pro
5、posed code or standard was made avail-able 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
6、.ASME does not take any position with respect to the validity of any patent rights asserted in connection with any itemsmentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringe-ment of any applicable letters patent, nor assume any such l
7、iability. Users of a code or standard are expressly advisedthat determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely theirown responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not to
8、be interpreted as gov-ernment or industry endorsement of this code or standard.ASME accepts responsibility for 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
9、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 Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2005THE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights
10、reservedPrinted in U.S.A.CONTENTSForeword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ivCommittee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11、 . vCorrespondence With the B18 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Comparison With ISO Standards . . . . . .
12、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Reference Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13、. . . . . . . . . . . . . . . . 25 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Nut Designs and Property Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Width Across
14、Flats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Wrenching Height . . . . . . . . . . . . . . . . .
15、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 Gaging of Hex Portion of Hex Flange Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211 Flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、 . . . . . . . . . . . . . . 612 Bearing Surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 613 Countersink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 614 T
17、hreads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 615 Material, Mechanical, and Performance Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 616 Testing . . . . . . . . . . . . . . . . . . . . . . .
18、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 717 Identification Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1018 Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19、 . . . . . . . . . . . . . . . . . . . . . . 1019 Workmanship . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1020 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、 . . . . . . 1021 Inspection and Quality Assurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1022 Designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Figure1 Load Measuring Devic
21、e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Tables1 Dimensions of Prevailing-Torque Hex Nuts Property Classes 5, 9, and 10 . . . . . . . . 32 Dimensions of Prevailing-Torque Hex Flange Nuts Property Classes 5, 9, and 10 . . 43 Proof Loads, Cla
22、mp Loads, and Prevailing Torques for Nuts . . . . . . . . . . . . . . . . . . . . 54Examples for Test Clamp Torque Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Test Washers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、. . . . . . . . . . . . 9iiiFOREWORDAmerican National Standards Committee B18 for the standardization of bolts, screws, nuts, riv-ets, and similar fasteners was organized in March 1922 as Sectional Committee B18 under theaegis of the American Engineering Standards Committee (later the American Stand
24、ards Associ-ation, the United States of America Standards Institute and, as of October 6, 1969, the AmericanNational Standards Institute, Inc.) with the Society of Automotive Engineers and the AmericanSociety of Mechanical Engineers as joint sponsors. Subcommittee 16 was established in 1961 andcharg
25、ed with the responsibility for technical content of standards covering prevailing-torque nuts.In 1972 the International Organization for Standardization published standards ISO 2320 andISO 2358, covering the mechanical and performance properties and dimensions of metric serieshexagon prevailing-torq
26、ue type nuts, respectively.In December 1974, Committee B18 directed Subcommittee 16 to discontinue work on standardsfor inch series prevailing-torque type hex nuts and to develop standards for metric series nuts.As a result, ASME B18.16.1M-1979, ASME B18.16.2M-1979, and ASME B18.16.3M-1982 wereappro
27、ved. B18.16.3M was revised in 1998 to better meet the needs of conformance with PublicLaw 100-592. The revision defined those dimensions or characteristics which should be certifiedto assure product fit, form, and function. Other dimensions given would only be examined in theevent of a dispute. Addi
28、tionally, the Subcommittee removed the bearing surface finish require-ment from the dimensional tables. It was felt that the torque at tension requirements of B18.16.2M-1979 adequately addressed the functional need for this characteristic.This Standard, ASME B18.16M-2004, is a revision and consolida
29、tion of ASME B18.16.1M-1979,ASME B18.16.2M-1979, and ASME B18.16.3M-1998.This Standard was approved as an American National Standard on September 9, 2004.ivASME B18 STANDARDS COMMITTEEStandardization of Bolts, Nuts, Rivets, Screws, Washers, and Similar Fasteners(The following is the roster of the Co
30、mmittee at the time of approval of this Standard.)OFFICERSD. A. Clever, ChairR. D. Strong, Vice ChairS. W. Vass, Vice ChairR. L. Crane, SecretaryCOMMITTEE PERSONNELJ. Altman, Rotor Clip Co. J. G. Langenstein, Consultant, Member EmeritusJ. H. Slass, Alternate, Rotor Clip Co. L. L. Lord, Caterpillar,
31、Inc., Corresponding MemberJ. B. Belford, Lawson Products, Inc. W. J. Lutkus, Heli Coil EmhartV. Cartina, Aztech Locknut A. D. McCrindle, Canadian Fasteners InstituteD. A. Clever, Deere however, theyshould not contain proprietary names or information.Requests that are not in this format will be rewri
32、tten in this format by the Committee prior tobeing answered, which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additional in-formation that might affect an interpretation is available. Further, persons aggri
33、eved by an in-terpretation 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 meetings, whichare open to
34、the public. Persons wishing to attend any meeting should contact the Secretary of theB18 Standards Committee.Intentionally left blank PREVAILING-TORQUE TYPE STEEL METRIC HEX NUTS AND HEX FLANGE NUTS1 SCOPEThis Standard covers the complete general, dimen-sional, mechanical, and performance data for m
35、etric prevailing-torque hex nuts and hex flange nuts of prop-erty classes 5, 9, and 10 as defined in ASTM A563M.The inclusion of dimensional data in this Standard isnot intended to imply that all of the nut sizes in con-junction with the various options described herein arestock items. Consumers sho
36、uld consult with suppliersconcerning lists of stock production prevailing-torquehex and hex flange nuts.2 COMPARISON WITH ISO STANDARDS2.1 Coordination With ISO StandardsHex and hex flange nuts as covered in this Standardhave been coordinated to the extent possible with ISO2320, ISO 7040, ISO 7041,
37、ISO 7042, ISO 7043, ISO 7044,ISO 7719, and ISO 7720. The dimensional differences arefew, except those of the M10 size. None affect the func-tional interchangeability of nuts manufactured to the re-quirements of either. The clamp torque values in Table4 of this Standard are significantly different co
38、mparedto the applied torques in ISO 2320 Annex C. ISO 2320does not make any coating distinctions.2.2 Letter SymbolsLetter symbols designating dimensional characteris-tics are in accord with those used in ISO standards, ex-cept that capitals have been used instead of lower caseletters used in ISO sta
39、ndards.2.3 ISO Width Across FlatsM10 hex and hex flange nuts with 15 mm width acrossflats are currently being produced and used in the U.S.and many other countries. This width across flats is notISO standard for hex nuts, but is ISO standard for hexflange nuts. The ISO standard for M10 hex nuts spec
40、i-fies 16 mm width across flats. Unless M10 hex nuts with15 mm width across flats are specifically ordered, M10hex nuts with 16 mm width across flats shall be fur-nished.ASME B18.16M-200413 REFERENCE STANDARDSThe following is a list of publications referenced inthis Standard. Unless otherwise specif
41、ied, the referencestandard(s) shall be the most recent issue at the time oforder placement.ASME B1.3M, Screw Thread Gaging Systems for Di-mensional Acceptability Inch and Metric ScrewThreads (UN, UNR, UNJ, M and MJ)ASME B1.13M, Metric Screw Threads M ProfileASME B18.2.3.1M, Metric Hex Cap ScrewsASME
42、 B18.12, Glossary of Terms for Mechanical Fas-tenersASME B18.18.1, Inspection and Quality Assurance forGeneral Purpose FastenersASME B18.18.2, Inspection and Quality Assurance forHigh Volume Machine Assembly FastenersASME B18.24, Part Identifying Number (PIN) Code Sys-tem Standard for B18 Fastener P
43、roductsASME Y14.5M, Dimensioning and TolerancingPublisher: The American Society of Mechanical Engi-neers (ASME), Three Park Avenue, New York, NY10016-5990; Order Department: 22 Law Drive, P.O.Box 2900, Fairfield, NJ 07007-2900ASTM A563M, Carbon and Alloy Steel Nuts (Metric)ASTM B487, Test Method for
44、 Measurement of Metal andOxide Coating Thicknesses by Microscopical Exami-nation of a Cross SectionASTM F467M, Nonferrous Nuts for General Use MetricASTM F586M, Carbon and Alloy Steel ExternallyThreaded Metric FastenersASTM F812/F812M, Surface Discontinuities of NutsASTM F836M. Style 1 Stainless Ste
45、el Metric NutsASTM F1137, Phosphate/Oil and Phosphate/OrganicCorrosion Protective Coatings for FastenersPublisher: American Society for Testing and Materials(ASTM), 100 Barr Harbor Drive, West Conshohocken,PA 19428-2959ISO 2320, Prevailing torque type steel hexagon nuts Mechanical and performance pr
46、opertiesISO 7040, Prevailing torque type hexagon nuts (withnon-metallic insert), style 1 Property classes 5, 8and 10ISO 7041, Prevailing torque type nuts (with non-metal-lic insert), style 2 Property classes 9 and 12ISO 7042, Prevailing torque all-metal hexagon nuts, style2Property classes 5, 8, 10
47、and 12ISO 7043, Prevailing torque type hexagon nuts withflange (with non-metallic insert) Product grades Aand BISO 7044, Prevailing torque type all-metal hexagon nutswith flange Product grades A and BISO 7719, Prevailing torque type all-metal hexagon nuts,style 1 Property classes 5, 8 and 10ISO 7720
48、, Prevailing torque type all-metal hexagon nuts,style 2 Property class 9Publisher: International Organization for Standardiza-tion (ISO), 1 rue de Varemb, Case Postale 56, CH-1211, Genve 20, Switzerland/SuisseSAE J121M, Decarburization in Hardened and Tem-pered Metric Threaded FastenersPublisher: So
49、ciety of Automotive Engineers (SAE), 400Commonwealth Drive, Warrendale, PA 15096-00014 TERMINOLOGYFor definitions of terms relating to fasteners or com-ponent features thereof used in this Standard, refer toASME B18.12.Unless otherwise noted, all references to nuts in thisStandard mean prevailing-torque hex nuts and hexflange nuts.5 DIMENSIONS Unless otherwise stated, all dimensions in this Stan-dard are in millimeters (mm), and apply before any plat-ing or coating. When a plating or coating is specified,the finished product dimensions shall be as agreed uponbetw
