1、AN AMERICAN NATIONAL STANDARDASME B18.2.9-2010(Revision of ASME B18.2.9-2007)Straightness Gage and Gaging for Bolts and ScrewsINTENTIONALLY LEFT BLANKASME B18.2.9-2010(Revision of ASME B18.2.9-2007)StraightnessGage andGaging for Boltsand ScrewsAN AMERICAN NATIONAL STANDARDThree Park Avenue New York,
2、 NY 10016 USADate of Issuance: September 6, 2010This 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. Periodically
3、 certain actions of the ASME B18 Committee may be published as Cases.Cases and interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org as they are issued.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standa
4、rd was developed under procedures accredited as meeting the criteria for American NationalStandards. 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 s
5、tandard was madeavailable 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 ta
6、ke any position with respect to the validity of any patent rights asserted in connection 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 assumes any such liability. Users of
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8、overnment 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 this document may be
9、 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 2010 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted i
10、n U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the B18 Committee vi1 Scope . 12 Comparison With ISO 4759-1:2000 . 13 Referenced Standards 14 Terminology . 15 Dimensions 16 Gage 17 Procedure . 18 Straightness Limits 1Table1 Screw and Bolt Straightness Limits 2Figures1 Typical Stra
11、ightness Gage . 22 Gaging . 2iiiFOREWORDIn May 2001, the ASME B18 Standards Committee, Standardization of Bolts, Nuts, Rivets,Screws, Washers, and Similar Fasteners, authorized B18 Subcommittee 2, Externally DrivenFasteners, to proceed with the development of a standard covering straightness gage an
12、d gagingfor bolts and screws. As a result, ASME B18.2.9 was approved as an American National Standardon March 7, 2007.In late 2008, B18 Subcommittee 2 undertook the addition of a set of default straightness limitsto apply to externally threaded inch and metric fasteners for which straightness limits
13、 are notstated in the applicable product standard.This revision was approved as an American National Standard on July 26, 2010.ivASME B18 COMMITTEEStandardization of Bolts, Nuts, Rivets, Screws,Washers, and Similar Fasteners(The following is the roster of the Committee at the time of approval of thi
14、s Standard.)STANDARDS COMMITTEE OFFICERSJ. Greenslade, ChairD. S. George, Vice ChairR. D. Strong, Vice ChairC. J. Gomez, SecretarySTANDARDS COMMITTEE PERSONNELV. Cartina, Autocraft IndustrialD. A. Clever, ConsultantA. P. Cockman, Ford Motor Co.C. D. de la Garza, TSPD. S. George, ND IndustriesC. J. G
15、omez, The American Society of Mechanical EngineersJ. Greenslade, Industrial Fasteners InstituteJ. J. Grey, Contributing Member, Fastener Consulting Services, Inc.B. Hasiuk, Contributing Member, Defense Supply CenterPhiladelphiaA. Herskovitz, ConsultantJ. Hubbard, Leland-Powell Fasteners, Inc.J. Jenn
16、ings, Contributing Member, Naval Surface Warfare CenterW. H. King, Porteous Fastener Co.J. F. Koehl, Contributing Member, Spirol International Corp.SUBCOMMITTEE 2 EXTERNALLY DRIVEN FASTENERSJ. Greenslade, Chair, Industrial Fasteners InstituteC. B. Williamson, Vice Chair, Fastenal Co.V. Cartina, Auto
17、craft IndustrialL. Claus, ATF, Inc.D. A. Clever, ConsultantA. P. Cockman, Ford Motor Co.C. D. de la Garza, TSPB. A. Dusina, Federal Screw WorksM. A. Elmi, ConsultantJ. S. Foote, Trade Association Management, Inc.D. S. George, ND IndustriesA. Herskovitz, ConsultantM. W. Holubecki, Electric Boat Corp.
18、J. Hubbard, Leland-Powell Fasteners, Inc.J. Jennings, Contributing Member, Naval Surface Warfare CenterW. H. King, Porteous Fastener Co.J. F. McCarrick, Defense Supply Center PhiladelphiavW. H. Kopke, ConsultantW. J. Lutkus, Emhart TeknologiesD. A. McCrindle, Canadian Fasteners InstituteM. D. Prasad
19、, Contributing Member, GlobalM however, they shouldnot contain proprietary names or information.RequeststhatarenotinthisformatmayberewrittenintheappropriateformatbytheCommitteeprior to being answered, which may inadvertently change the intent of the original request.ASME procedures provide for recon
20、sideration of any interpretation when or if additionalinformation that might 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, constructio
21、n, proprietary device, or activity.Attending Committee Meetings. TheB18StandardsCommitteeregularlyholdsmeetings,whichare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B18 Standards Committee.viASME B18.2.9-2010STRAIGHTNESS GAGE AND GAGING FORBOLTS AND S
22、CREWS1 SCOPEThis Standard describes the gage and procedure forcheckingboltandscrew straightnessatmaximummate-rial condition (MMC) and provides default limits whennot stated in the applicable product standard.2 COMPARISON WITH ISO 4759-1:2000ThisStandardusesanadjustablegage,insteadofplainsleeve gages
23、 like the example shown in ISO 4759-1AnnexC,Fig.C.24.Theadjustablegageavoidstheneces-sity of a different gage for each diameterlength combi-nation,andforeachdifferenceinthespecifiedtoleranceson diameter, or straightness, or both, of the fastener.3 REFERENCED STANDARDSFor undated references, the most
24、 recent issues of thereferenced standards apply.ASME B18.12, Glossary of Terms for MechanicalFastenersASME 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 2900, Fairf
25、ield, NJ 07007 (www.asme.org)ISO 4759-1:2000 Tolerances for fasteners Part 1: bolts,screws, studs, and nuts Product grades A, B and C1Publisher: International Organization forStandardization (ISO), 1, ch. de la Voie-Creuse, CasePostale 56, CH-1211 Geneve 20, Switzerland/Suisse(www.iso.org)4 TERMINOL
26、OGYFor definitions of terms relating to fasteners or fea-turesthereofusedinthisStandard,refertoASMEB18.12.5 DIMENSIONSFor definitions of terms relating to dimensioning andtolerancing, refer to ASME Y14.5M.1May also be obtained from American National StandardsInstitute (ANSI), 25 West 43rd Street, Ne
27、w York, NY 10036.16 GAGEThe gage consists of a stationary rail, an adjustablerail, micrometers that indicate the distance between therails at each end, and a means to secure the adjustablerail in place. A typical gage is illustrated in Fig. 1.7 PROCEDURE(a) The excluded length, illustrated in Fig. 2
28、, is thelength,ifany,thatistobeexcludedfromthestraightnessgage, as specified by the product standard.(b) Thegagedlength,illustratedinFig.2,iscalculatedas the bolt or screw length minus the excluded length.(c) ThestraightnesstoleranceatMMCfortheproductto be inspected is calculated for the gaged lengt
29、h by theformula specified in the product standard.(d) The resultant condition is calculated as the largerof the maximum major diameter of the thread or themaximum body diameter of the bolt or screw, plus thestraightness tolerance at MMC.(e) The adjustable rail of the gage is adjusted to pro-vide apa
30、rallel spacebetween the railsequal tothe resul-tant condition by obtaining common readings on bothmicrometer heads, and is secured in place.(f) The gaged length of the product to be inspectedis inserted between the rails, then rotated by handthrough a full 360 deg. Any interference occurringbetween
31、the product and the gage sufficient to preventrotation indicates that the specified straightness is notmet.8 STRAIGHTNESS LIMITSUnless otherwise specified in the product standard orby the purchaser, the straightness limits for all types ofscrews and bolts are listed in Table 1.ASME B18.2.9-2010Fig.
32、1 Typical Straightness GageAdjustable railSecuring screwsSee Note (1)Reverse reading micrometer headsSee Note (1)NOTE:(1) The gage must be of sufficient width and length to accommodate the diameter and length of the fastener being gaged.Fig. 2 GagingExcluded length para. 7(a)(a) Screw (b) BoltResult
33、ant conditionpara. 7(d)Gagedlengthpara. 7(b)Excluded length para. 7(a)Resultant conditionpara. 7(d)Gagedlengthpara. 7(b)Table 1 Screw and Bolt Straightness LimitsInch Screw and Bolt Lengths Metric Screw and Bolt LengthsL 12 in. 12 in. L 24 in. L 300 mm 300 mm L 600 mm0.006 in./in. 0.008 in./in. 0.006 mm/mm 0.008 mm/mm2INTENTIONALLY LEFT BLANKM19110ASME B18.2.9-2010
