1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Fasteners - Bolts, screws and studs - Nominal lengths and thread lengthsBS EN ISO 888:2018National forewordThis British Standard is the UK implementation of EN ISO 888:2018. It is identical to ISO 888:2012. It supersede
2、s BS ISO 888:2012, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee FME/9/-/2, Fasteners for structural bolting.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to includ
3、e all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 97893 7ICS 21.060.10Compliance with a British Standard cannot confer immunity from legal obligations.This Brit
4、ish Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2012.Amendments/corrigenda issued since publicationDate Text affected31 July 2018 This corrigendum renumbers BS ISO 888:2012 as BS EN ISO 888:2018BRITISH STANDARDBS EN ISO 888:2018EUROPEAN STANDAR
5、DNORME EUROPENNEEUROPISCHE NORMEN ISO 888June 2018ICS 21.060.10EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN Ref. No. EN ISO 888:2018: EAll rights of exploitation in any form
6、 and by any means reserved worldwide for CEN national MembersFasteners - Bolts, screws and studs - Nominal lengths and thread lengths (ISO 888:2012)Fixations - Vis, goujons et tiges filetes - Longueurs nominales et longueurs filetes (ISO 888:2012)Verbindungselemente - Schrauben - Nenn- und Gewindeln
7、gen (ISO 888:2012)This European Standard was approved by CEN on 23 April 2018.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibl
8、iographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the respons
9、ibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republ
10、ic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN ISO 888:2018 (E)European forewordThe t
11、ext of ISO 888:2012 has been prepared by Technical Committee ISO/TC 2 “Fasteners” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 888:2018 by Technical Committee CEN/TC 185 “Fasteners” the secretariat of which is held by BSI.This European Standard shall
12、be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2018, and conflicting national standards shall be withdrawn at the latest by December 2018.Attention is drawn to the possibility that some of the elements of this docum
13、ent may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium,
14、 Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Sw
15、itzerland, Turkey and the United Kingdom.Endorsement noticeThe text of ISO 888:2012 has been approved by CEN as EN ISO 888:2018 without any modification.iiBS EN ISO 888:2018ISO 888:2012Foreword iv1 Scope . 12 Normative references 13 Symbols 14 Position of lengths and thread lengths 14.1 General . 14
16、.2 Bolts and screws 24.3 Headless screws and set screws 34.4 Studs and similar fasteners 35 Dimensions for lengths 56 Dimensions for thread lengths 6 ISO 2012 All rights reserved iiiContents PageBS EN ISO 888:2018ISO 888:2012ForewordISO (the International Organization for Standardization) is a world
17、wide 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 for which a technical committee has been established has the right to be represented on t
18、hat 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) on all matters of electrotechnical standardization.International Standards are drafted in
19、accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard re
20、quires 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 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 888 was prepared by Technical
21、 Committee ISO/TC 2, Fasteners, Subcommittee SC 7, Reference standards.This second edition cancels and replaces the first edition (ISO 888:1976), which has been technically revised.iv ISO 2012 All rights reservedBS EN ISO 888:2018Fasteners Bolts, screws and studs Nominal lengths and thread lengths1
22、ScopeThis International Standard specifies lengths and thread lengths for bolts, screws and studs for use in appropriate product standards and other relevant documents, e.g. for parts per drawing.It applies to bolts, screws and studs with ISO metric screw thread according to ISO 68-1.2 Normative ref
23、erencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 68-1, ISO general purpose screw threads
24、 Basic profile Part 1: Metric screw threadsISO 225, Fasteners Bolts, screws, studs and nuts Symbols and descriptions of dimensionsISO 4753, Fasteners Ends of parts with external ISO metric threadISO 4759-1, Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and C3 Sym
25、bolsb thread lengthb 1thread length of one end for double-end studb 2thread length of the other end for double-end studb mthread length of the stud metal endd basic major diameter (nominal diameter) of the threadl nominal length (of the bolt, screw or stud)l gdistance from the bearing face to the fi
26、rst full form (full profile) thread (bolt), as specified in ISO 225l slength of the unthreaded shankP pitch of the thread4 Position of lengths and thread lengths4.1 GeneralThe nominal length, l, and the thread length, b, features for bolts, screws and studs are specified in ISO 225.Points for bolts
27、and screws are usually included in the length and thread length, except for the pilot point; they are specified in ISO 4753.INTERNATIONAL STANDARD ISO 888:2012 ISO 2012 All rights reserved 1BS EN ISO 888:2018ISO 888:20124.2 Bolts and screwsFor bolts and screws with effective bearing surface perpendi
28、cular to the axis, the length shall be defined from the bearing face to the end of the bolt or screw; see Figure 1.Figure 1 Length for bolts and screws with effective bearing surface perpendicular to the axisFor flat countersunk bolts and screws, the length shall be defined from the upper edge of th
29、e head to the end of the bolt or screw; see Figure 2.Figure 2 Length for bolts and screws with flat countersunk headFor raised countersunk bolts and screws, the length shall be defined from the theoretical intersection of the top surface of the head with the head diameter to the end of the bolt or s
30、crew; see Figure 3.Figure 3 Length for bolts and screws with raised countersunk headFor concave bearing surfaces, serrated bearing surface and similar, the length shall be defined from the effective bearing plane of the bearing face to the end of the bolt or screw; see Figures 4 and 5.2 ISO 2012 All
31、 rights reservedBS EN ISO 888:2018ISO 888:2012Figure 4 Length for bolts and screws with concave bearing surfaceFigure 5 Length for bolts and screws with serrated bearing surface4.3 Headless screws and set screwsFor headless screws and set screws, the length shall be defined from one extreme end to t
32、he other; see Figures 6 and 7.Figure 6 Length for headless screws with shankFigure 7 Length for set screws4.4 Studs and similar fastenersFor partially threaded studs (double-end studs), the length shall be defined from the thread run-out at the metal end to the end of the stud at the nut end; see Fi
33、gure 8.NOTE The thread length of the stud metal end, bm, according to ISO 225, is not within the scope of this International Standard. ISO 2012 All rights reserved 3BS EN ISO 888:2018ISO 888:2012Key1 stud metal end2 nut endFigure 8 Length for partially threaded studs (two threaded ends/shanks)For ti
34、e rods (double-end studs with right- and left-hand threads/tensioning studs), for partially threaded studs (single-end stud), for totally threaded studs with points (chamfer or flat) and totally threaded studs (threaded rods/studding), the length shall be defined from one extreme end to the other; s
35、ee Figures 9 to 12.Figure 9 Length for tie rodFigure 10 Length for partially threaded studs (single-end stud)Figure 11 Length for totally threaded studs (continuous thread)Figure 12 Length for totally threaded studs (threaded rods)4 ISO 2012 All rights reservedBS EN ISO 888:2018ISO 888:20125 Dimensi
36、ons for lengthsDimensions for the lengths are specified in Table 1.Table 1 Lengths for ISO metric bolts, screws and studsDimensions in millimetresProduct grade Product gradeA B C A B Cl l minl maxl minl maxl minl maxl l minl maxl minl maxl minl max2 1,80 2,20 (85) 84,30 85,70 83,25 86,75 83,25 86,75
37、(2,5) 2,30 2,70 90 89,30 90,70 88,25 91,75 88,25 91,753 2,80 3,20 (95) 94,30 95,70 93,25 96,75 93,25 96,754 3,76 4,24 100 99,30 100,70 98,25 101,75 98,25 101,755 4,76 5,24 (105) 104,30 105,70 103,25 106,75 103,25 106,756 5,76 6,24 110 109,30 110,70 108,25 111,75 108,25 111,75(7) 6,71 7, 29 (115) 114
38、,30 115,70 113,25 116,75 113,25 116,758 7,71 8,29 120 119,30 120,70 118,25 121,75 118,25 121,75(9) 8,71 9,29 (125) 124,20 125,80 123,00 127,00 123,00 127,0010 9,71 10,29 9,25 10,75 9,25 10,75 130 129,20 130,80 128,00 132,00 128,00 132,00(11) 10,65 11,35 10,10 11,90 10,10 11,90 140 139,20 140,80 138,
39、00 142,00 138,00 142,0012 11,65 12,35 11,10 12,90 11,10 12,90 150 149,20 150,80 148,00 152,00 148,00 152,00(14) 13,65 14,35 13,10 14,90 13,10 14,90 160 159,20 160,80 158,00 162,00 156,00 164,0016 15,65 16,35 15,10 16,90 15,10 16,90 (170) 169,20 170,80 168,00 172,00 166,00 174,00(18) 17,65 18,35 17,1
40、0 18,90 17,10 18,90 180 179,20 180,80 178,00 182,00 176,00 184,0020 19,58 20,42 18,95 21,05 18,95 21,05 (190) 189,10 190,90 187,70 192,30 185,40 194,60(22) 21,58 22,42 20,95 23,05 20,95 23,05 200 199,10 200,90 197,70 202,30 195,40 204,6025 24,58 25,42 23,95 26,05 23,95 26,05 220 219,10 220,90 217,70
41、 222,30 215,40 224,60(28) 27, 58 28,42 26,95 29,05 26,95 29,05 240 239,10 240,90 237,70 242,30 235,40 244,6030 29,58 30,42 28,95 31,05 28,95 31,05 260 257,40 262,60 254,80 265,20(32) 31,50 32,50 30,75 33,25 30,75 33,25 280 277,40 282,60 274,80 285,2035 34,50 35,50 33,75 36,25 33,75 36,25 300 297,40
42、302,60 294,80 305,20(38) 37, 50 38,50 36,75 39,25 36,75 39,25 320 317,15 322,85 314,30 325,7040 39,50 40,50 38,75 41,25 38,75 41,25 340 337,15 342,85 334,30 345,7045 44,50 45,50 43,75 46,25 43,75 46,25 360 357,15 362,85 354,30 365,7050 49,50 50,50 48,75 51,25 48,75 51,25 380 377,15 382,85 374,30 385
43、,7055 54,40 55,60 53,50 56,50 53,50 56,50 400 397,15 402,85 394,30 405,7060 59,40 60,60 58,50 61,50 58,50 61,50 420 416,85 423,15 413,70 426,3065 64,40 65,60 63,50 66,50 63,50 66,50 440 436,85 443,15 433,70 446,3070 69,40 70,60 68,50 71,50 68,50 71,50 460 456,85 463,15 453,70 466,30(75) 74,40 75,60
44、73,50 76,50 73,50 76,50 480 476,85 483,15 473,70 486,3080 79,40 80,60 78,50 81,50 78,50 81,50 500 496,85 503,15 493,70 506,30Nominal lengths in parentheses (brackets) should be avoided, if possible.Tolerances for length are calculated in accordance with ISO 4759-1. ISO 2012 All rights reserved 5BS E
45、N ISO 888:2018ISO 888:20126 Dimensions for thread lengthsUnless otherwise specified in a product standard, dimensions for thread lengths, b (see Table 2), shall be calculated as follows: for l 125 mm: b = 2d + 6 mm for 125 mm 200 mm: b = 2d + 25 mmWhen the calculation for shorter bolts results in a
46、shank (unthreaded portion) of length 0,5d, the bolt should be fully threaded.Table 2 Thread lengths for ISO metric bolts, screws and studsDimensions in millimetresThread diameterd 1,6 2 2,5 3 4 5 6 8 10 12 (14) 16 18 20 22Thread length bl 125 9 10 11 12 14 16 18 22 26 30 34 38 42 46 50125 200 57 61
47、65 69Thread diameterd 24 27 30 33 36 39 42 45 48 52 56 60 64 68 72Thread lengthbl 125 54 60 66 72 78 84 90 96 102 125 200 73 79 85 91 97 103 109 115 121 129 137 145 153 161 169Thread diameterd 76 80 85 90 95 100 105 110 115 120 125 130 140 150 160Thread lengthbl 125 125 200 177 185 195 205 215 225 2
48、35 245 255 265 275 285 305 325 345Tolerances for thread lengths are specified in ISO 4759-1 as follows:a) for bolts and screws with drives (e.g. hexagon head, hexagon head with flange, hexagon socket head cap, hexalobular cylindrical head, cup head square neck, hexagon or hexalobular countersunk hea
49、d bolts and similar bolts specified in ISO 225), the tolerances are expressed in terms of lgand ls, and are specified in product standards according to the following: lg,max= lnom b ls,min= lg,max 5P b) for slotted or recessed screws and similar screws (e.g. pan head, cheese head, countersunk head specified in I
