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1、ISO 4759-1:2000(E)INTERNATIONALSTANDARDISO 4759-1 ISO 2000 - All rights reservedSecond edition2000-11-15Tolerances for fasteners Part 1:Bolts, screws, studs and nuts Product grades A, B and CTolerances des elements de fixation Partie 1: Vist gojos et ecrous Grades Af Bet CReference numberISO 4759-12
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5、000All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the cou
6、ntry of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. +41 22 749 01 11Fax + 41 22 749 09 47E-mail CoPyrightiso.chWeb www.iso.chPrinted in SwitzerlandISO 4759-1 =2000(E)ContentsPageForewordiv1 Scope - .,12 Normative references 23 Tolerances for metric bolls, screws and studs
7、 34 Tolerances for metric nuts，.，.，.，.，.，.“.，.255 Tolerances for tapping screws36Annex A (informative) Tolerances 44Annex B (informative) Examples of dimensioned and Ioleranced fasteners. *46Annex C (informative) Examples of gauges and other measuring devices 49 ISO 2000 - All rights reservediiiISO
8、4759-1:2000(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject
9、for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) o
10、n all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International
11、 Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this part of ISO 4759 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.International
12、 Standard ISO 4759*1 was prepared by Technical Committee ISO/TC 2s Fasfeners1 Subcommittee SC 7, Reference Standards for fasteners (mainly covering terminology, dimensioning, sizes and toleracing).This second edition cancels and replaces the first edition (ISO 4759-1:1978), which has been technicall
13、y revised.ISO 4759 consists of the following parts, under the general title Tolerances for fasteners: Part 1: Boltsf screws, studs and nuts Product grades A, B and C Part 3; Plain washers for bolts, screws ans nuts Product grades A and CAnnexes A to C of this part of ISO 4759 are for information onl
14、y. ISO 2000 - All rights reservedINTERNATIONAL STANDARDISO 4759-1:2000(E)Tolerances for fasteners Part 1:Bolts, screws, studs and nuts Product grades A, B and C1 ScopeThis part of ISO 4759 specifies a selection of tolerances for bolts, screws, studs and nuts with ISO metric threads and with product
15、grades A, B and C and for tapping screws with product grade A.NOTE The product grades refer to the size of the tolerances where grade A is the most precise and grade C is the least precise.The tolerances, except tolerances for threads, are selected from the system of limits and fits specified in ISO
16、 286-1 and ISO 286-2. The tolerances for metric threads are taken from the series of tolerance classes specified in ISO 965-3. The tolerances for tapping screw threads are covered in ISO 1478.The tolerances of form and position are specified and indicated in accordance with ISO 11011 ISO 8015 and IS
17、O 2692.The tolerances specified in this part of ISO 4759 apply to fasteners prior to coating unless otherwise specified. See also ISO 4042.Deviations from the tolerances specified in this part of ISO 4759 are only permitted in product standards where there are valid technical reasons. In cases where
18、 there is a difference between the tolerance requirements In this part of ISO 4759 and the product standard, the product standard takes precedence.It is recommended that these tolerances also be used for non-standard fasteners.Dimensions and tolerances given in this part of ISO 4759 are in millimetr
19、es. ISO 2000 - All rights reserved1ISO 4759-1:2000(E)2 Normative referencesThe following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 4759. For dated references, subsequent amendments to, or revisions of, any of these publica
20、tions do not apply. However, parties to agreements based on this part of ISO 4759 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. M
21、embers of ISO and IEC maintain registers of currently valid International Standards.ISO 225:1983, Fasteners Bolts, screws, studs and nuts Symbols and designation of dimensions.ISO 286-1:1988, ISO system of limits and fits Part 1: Bases of tolerances, deviations and fits.ISO 286-2:1988, ISO system of
22、 limits and fits Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts.ISO 885:2000, General purpose bolts and screws Metric series Radii under the head.ISO 965-3:1998, ISO general purpose metric screw threads Tolerances Part 3: Deviations for constructional screw thr
23、eads.ISO 1101:2000, Geometrical Product Specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-out.ISO 1478:1999, Tapping screws thread.ISO 1479:1983, Hexagon head tapping screws.ISO 2692:1988, Technical drawings Geometrical tolerancing Maximum material princi
24、ple.ISO 4032:1999, Hexagon nutst style 7 Product grades A and S.ISO 4042:1999, Fasteners Electroplated coatings.ISO 4757:1983, Cross recesses for screws.ISO 7053:1992, Hexagon washer head tapping screws.ISO 7721:1983, Countersunk head screws Head configuration and gauging.ISO 8015:1985, Technical dr
25、awings Fundamental tolerancing principle.ISO 10509:1992, Hexagon flange head tapping screws.ISO 10642:1997, Hexagon socket countersunk head screws.ISO 10664:1999, Hexalobular internal driving feature for bolts and screws.# ISO 2000 - All rights reservedISO 4759-1 =2000(lE)3 Tolerances for metric bol
26、ts, screws and studs3J Dimensional tolerancesSymbols and designations of dimensions are specified in ISO 225.FeatureTolerance forAproduct gracBlesCNotes3.1.1 Tolerance levelShank and bearing surfaceOther featuresclosecloseclose widewide wide3.1.2 External thread6g6gSg(but 6g for property class 8.8 a
27、nd higher)For certain products and coatings, other tolerance classes for threads may be specified in the relevant product and coating standards.3.1.3 Driving featuresToleranceSTolerance3.131J Width across 小5flats3030h13h14 18 186060 180180h14h15h16h17Figure 1Figure 2 ISO 2000 - All rights reservedIS
28、O 4759-1:2000(E)# ISO 2000 - All rights reservedFeatureTolerance for product grades ABCNotes31.312 Width across cornersFigure 3Emin =Ij 3 .Vmji = 1,12 jn for bolts and screws with flangeand other cold forged heads without trimmingoperationFigure 43.1.3.1.3 Height of headin =1,3 SminkToleranceJS14js1
29、5 14D1231322ClotsNFlToleranceTolerance fieldC13for W 1C14for 1Wl 1 3+ 0,20 + OQ6 + 0,31 + 0,06CUU 3 6+ 0,37+ 0,07/TX.FigurBlO ISO 2000 - All rights reserved17FeatureTolerance for product grades ABCNotes3.1.3.2.3 Depth of hexagon sockets and slotsThe depth of hexagon sockets and slots is specified in
30、 product standards only as a minimum. It is restricted by the minimum wall thickness w.For the time being generally applicable tolerances cannot be specified.Figure 113.1.3.2.4 Cross recesses3.3.2.5 Hexalobiilar recessesSee ISO 4757 for all dimensions except penetration depths. For penetration depth
31、s see appropriate product standard.See ISO 10664 for all dimensions except penetration depths. For penetration depths see appropriate product standard.3.1.4 Other featuresFigure 12h13aaIT13for knurled headsCombined control of diameter and height for countersunk head screws in accordance with ISO 772
32、1 or ISO 10642.Figure 13h14FeatureTolerance for product grades ABCNotes3.1.4.2 Head height (except for hexagon heads)Figure 14W M5:h13 M5: h14Figure 153.1.4.3Bearing face diameter andheight of washer-faced portionFor countersunk head screws k is definied in product standards only as a maximum.Combin
33、ed control of diameter and height for countersunk head screws In accordance with ISO 7721 or ISO 10642.Xa Reference datum for dvvFigure 16Thread diametermin.max. 1,6 to 2,50,100,25 2,5 to 40,150,404 to 60,150,50 6 to 140,150,6014 to 360,200,80360,301,0Jw rnn = Smin - T16 for width across flats W25 m
34、in OJ42,55 min 025510k min -。41016dk min - 口万1624d min - ,82436k min 一 136dk min - 1,2For product gradeA onlyFigure 19a for products without undercut is specified in ISO 885.da for undercut products, see the appropriate product standard.FeatureNotesTolerance for product grades ABCjs15js17 150：js17 1
35、50:IT17Figure 20Feature3.1.4.5 Thread IengthFigure 213.1.4.6Shank diameterFigure 22Tolerance for product gradesNoteSABCP is the pitch of thread.s is the minimum length of the unthreaded (plain) shank.2尸 0小2尸 02尸 0/g is the maximum length of the unthreaded shank (thread run-out included) and is there
36、fore the minimum clamping length.b+2P 0b+牙 0b C尸UTolerance + 2 P related to dimension b applies only where s and g are not specified in the product standard.b+2P 0勿m js16炉2尸 0mjs172尸 0m河7Lm refers to metal end of studs only.h13h14 IT 15The tolerance is not applicable in the areas of the underhead fi
37、llet and thread run-out.Reduced shank diameter 与 pitch diameter3.2 Geometrical tolerancesIn accordance with ISO 1101 and ISO 2692 the tolerances specified in Figures 23 to 57 do not necessarily imply the use of any particular method of production, measurement or gauging.When the pitch diameter axis
38、is specified as the datum and the coaxiality deviation of the major diameter axis relative to the pitch diameter axis is negligible, e.g. normally with rolled threads, the major diameter axis may be taken as the datum.According to ISO 1101 when the datum is the thread axis the letters MD indicate th
39、at the datum reference is the major diameter axis.Tolerance Hor product grades Notes ABCThe maximum material principle in accordance with ISO 2692 is used.Feature3.2.1 Driving feature3.2.1.1 Tolerances of form321.1.1 Externala 3 simultaneously.Figure 23a 2 simultaneously.Figure 24FeatureTolerance ffor product gradesABCTolerance fbased ondimensionsNotes3.2.1.1.2 Internala 3 simultaneously.Figure 2532aL2 TOleranCeS of position2IT13 2IT142IT150,5d max.0.5d max.a The datum A shall be as close to the head as possible but within 0,