1、Tyres (ply rating marked series) and rims for agricultural tractors and machinesPart 2: Tyre load ratingsBS ISO 42512:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK implementation of ISO 42512:2017.It supersedes B
2、S ISO 42512:2005+A1:2011, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee AUE/4, Tyres and wheels for motor vehicles.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to
3、include all the necessary provisions of a contract. Users are responsible for its correct application.ISBN 978 0 580 82157 8ICS 83.160.30Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy a
4、nd Strategy Committee on 30 April 2017.Amendments/corrigenda issued since publicationDate Text affected BRITISH STANDARDBS ISO 42512:2017 ISO 2017Tyres (ply rating marked series) and rims for agricultural tractors and machines Part 2: Tyre load ratingsPneumatiques (srie marquage “PR“) et jantes pour
5、 tracteurs et machines agricoles Partie 2: Capacits de charge des pneumatiquesINTERNATIONAL STANDARDISO4251-2Seventh edition20170401Reference numberISO 42512:2017(E)BS ISO 42512:2017ISO 4251-2:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll ri
6、ghts reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from
7、either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 42512:2017ISO 4251-2:2017(E)Foreword iv1 Scope . 12 Normativ
8、e references 13 Terms and definitions . 14 Tyre loads 14.1 Agricultural drive wheels Tractor tyres . 14.2 Agricultural steering wheels Tractor tyres . 24.3 Agricultural implement tyres . 2Annex A (normative) Tyres with nominal rim diameter codes 15.3 and 16.1 and small agricultural tractor tyres 15B
9、ibliography .17 ISO 2017 All rights reserved iiiContents PageBS ISO 42512:2017ISO 4251-2:2017(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 carri
10、ed 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 that committee. International organizations, governmental and nongovernmental, in liaison with ISO, also take part in the work. IS
11、O collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different
12、approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be t
13、he subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).An
14、y trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organiz
15、ation (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.This document was prepared by ISO/TC 31, Tyres, rims and valves, SC 5, Agricultural tyres and rims.This seventh edition cancels and replaces the sixth edition (ISO 42512:2005) which h
16、as been technically revised. It also replaces ISO 42512:2005/Amd, 1.The seventh edition contains the following main changes: a new term “hillside combine” was added to the terms and definition clause; the tables have been updated incorporating Amendment 1.iv ISO 2017 All rights reservedBS ISO 42512:
17、2017Tyres (ply rating marked series) and rims for agricultural tractors and machines Part 2: Tyre load ratings1 ScopeThis document establishes the load ratings of the ply rating marked series of tyres for agricultural tractors and machines.Tyre designation and dimensions, and approved rim contours a
18、re given in ISO 42511.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the reference
19、d document (including any amendments) applies.ISO 42231, Definitions of some terms used in the tyre industry Part 1: Pneumatic tyres3 Terms and definitionsFor the purposes of this document the terms and definitions given in ISO 42231 and the following apply.ISO and IEC maintain terminological databa
20、ses for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp3.1load inflation pressure relationshiploads as given in the tables which are maximum values and are valid for the ref
21、erence inflation pressures indicated3.2cyclic loading applicationgradual increase of payload to maximum allowable load with unloading before offfield transport3.3hillside combinecombine intended for service on slopes above 11 (20%) lateral slope4 Tyre loads4.1 Agricultural drive wheels Tractor tyres
22、Basic tyre loads for tyres of diagonal construction, used as singles at a maximum speed of 30 km/h, and reference inflation pressures are given in Table 1.INTERNATIONAL STANDARD ISO 4251-2:2017(E) ISO 2017 All rights reserved 1BS ISO 42512:2017ISO 4251-2:2017(E)On combine harvesters in cyclic loadin
23、g service, except hillside combines, a load of up to 170 % of the basic tyre loads given in Table 1 is permitted for speeds up to 10 km/h with an inflation pressure increase of approximately 30 % (consult tyre manufacturers). This load increase shall include all possible field and user modifications
24、 that increase vehicle mass. The wheel and rim manufacturers shall be consulted concerning the strength of the wheels.Tyre loads at different speeds (load/speed relationship) are given in Table 2 for tyres of diagonal construction with normal section height and tyres of diagonal construction with lo
25、w section height.Loads for tyres of diagonal and radial constructions for special cultivation work and corresponding reference inflation pressures are given ina) Table 3 for a maximum speed of 30 km/h;b) Table 4 for cultivation work at a maximum speed of 10 km/h.For tyre load and inflation pressure
26、recommendations for combine harvesters in transport service, the tyre manufacturer shall be consulted.4.2 Agricultural steering wheels Tractor tyresBasic tyre loads at a maximum speed of 30 km/h, and their corresponding reference inflation pressures are given in Table 5 for tyres of diagonal constru
27、ction.Tyre loads at different speeds (load speed relationship) are given in Table 6 for tyres of diagonal construction with normal and low section heights.On combine harvesters in cyclic loading application, except hillside combines, a load of up to 150 % of the basic tyre loads given in Table 6 is
28、permitted for speeds up to 10 km/h. This load increase shall include all possible field and user modifications that increase vehicle mass. The wheel and rim manufacturers shall be consulted concerning the strength of the wheel.4.3 Agricultural implement tyresBasic tyre loads at a maximum speed of 30
29、 km/h and their corresponding reference inflation pressures are given in Table 7 for tyres of diagonal construction.Table 1 Agricultural drive wheels Tractor tyres (diagonal construction) Basic tyre loads (BTL) for tires used as singles at a maximum speed of 30 km/h and at reference inflation pressu
30、res (IP)Tyre size designationLoad indexLIPly rating PRBasic tyre load BTLkgInflation pressure IPkPa8.3 1681 4 462 15090 6 600 2308.3 2492 4 630 160100 6 800 2408.3 36107 6 975 230113 8 1 150 3208.3 38108 6 1 000 230114 8 1 180 3208.3 42111 6 1 090 230117 8 1 285 3208.3 44111 6 1 090 230117 8 1 285 3
31、202 ISO 2017 All rights reservedBS ISO 42512:2017ISO 4251-2:2017(E)Tyre size designationLoad indexLIPly rating PRBasic tyre load BTLkgInflation pressure IPkPa9.5 1688 4 560 14096 6 710 2109.5 22103 6 875 210106 8 950 2809.5 2497 4 730 160106 6 950 240102 4 850 1409.5 32 110 6 1 060 210116 8 1 250 28
32、0104 4 900 1409.5 36 112 6 1 120 210118 8 1 320 2809.5 38113 6 1 150 210119 8 1 360 2809.5 42115 6 1 215 210121 8 1 450 2809.5 44116 6 1 250 210122 8 1 500 2809.5 48118 6 1 320 210123 8 1 550 28011.2 20105 6 925 180112 8 1 120 25011.2 24102 4 850 130110 6 1 060 180116 8 1 250 240119 10 1 360 300104
33、4 900 13011.2 28 112 6 1 120 180118 8 1 320 24011.2 36 109 4 1 030 12011.2 38 110 4 1 060 12011.2 42119 6 1 360 180125 8 1 650 25012.4 16111 8 1 090 220119 12 1 360 330106 4 950 11012.4 24 115 6 1 215 170120 8 1 400 230109 4 1 030 11012.4 28 117 6 1 285 170122 8 1 500 230 ISO 2017 All rights reserve
34、d 3BS ISO 42512:2017ISO 4251-2:2017(E)Tyre size designationLoad indexLIPly rating PRBasic tyre load BTLkgInflation pressure IPkPa12.4 32110 4 1 060 110119 6 1 360 170124 8 1 600 230128 10 1 600 280112 4 1 120 11012.4 36 121 6 1 450 170126 8 1 700 230113 4 1 150 11012.4 38 122 6 1 500 170127 8 1 750
35、23012.4 42115 4 1 215 110123 6 1 550 17012.4 46125 6 1 650 170131 8 1 950 220100 4 800 10013.6 16 109 6 1 030 150114 8 1 180 19013.6 24109 4 1 030 100118 6 1 320 160123 8 1 550 200128 10 1 800 25013.6 28112 4 1 120 100121 6 1 450 160125 8 1 650 200130 10 1 900 25013.6 36116 4 1 250 100125 6 1 650 16
36、0129 8 1 850 200134 10 2 120 25013.6 38117 4 1 285 100126 6 1 700 160131 8 1 950 200136 10 2 240 25013.6 46129 6 1 850 150134 8 2 120 19013.6 48130 6 1 900 150135 8 2 180 19014.9 24112 4 1 120 80123 6 1 550 140128 8 1 800 180132 10 2 000 230124 6 1 600 14014.9 26 129 8 1 850 1804 ISO 2017 All rights
37、 reservedBS ISO 42512:2017ISO 4251-2:2017(E)Tyre size designationLoad indexLIPly rating PRBasic tyre load BTLkgInflation pressure IPkPa133 10 2 060 23014.9 28112 4 1 120 110125 6 1 650 140130 8 1 900 180134 10 2 120 230126 6 1 700 14014.9 30 131 8 1 950 180135 10 2 180 230129 6 1 850 14014.9 38 135
38、8 2 180 180139 10 2 430 230127 6 1 750 14015.5 38 133 8 2060 180137 10 2 300 230126 6 1 700 13016.9 24 133 8 2 050 170136 10 2 240 200128 6 1 800 13016.9 26 134 8 2 120 170137 10 2 300 20016.9 28129 6 1 850 130135 8 2 180 170139 10 2 430 200143 12 2 725 240130 6 1 900 13016.9 30 137 8 2 300 170140 1
39、0 2 500 200133 6 2 060 13016.9 34 139 8 2 430 170142 10 2 650 200135 6 2 180 13016.9 38 141 8 2 575 170143 10 2 725 20018.4 24131 6 1 950 110135 8 2 180 140141 10 2 575 180145 12 2 900 22018.4 26132 6 2 000 110136 8 2 240 140142 10 2 650 160146 12 3 000 230 ISO 2017 All rights reserved 5BS ISO 42512
40、:2017ISO 4251-2:2017(E)Tyre size designationLoad indexLIPly rating PRBasic tyre load BTLkgInflation pressure IPkPa18.4 28133 6 2 060 110138 8 2 360 140143 10 2 725 180147 12 3 075 22018.4 30134 6 2 120 110139 8 2 430 140145 10 2 900 180149 12 3 250 230137 6 2 300 110142 8 2 650 14018.4 34 146 10 3 0
41、00 180150 12 3 350 230153 14 3 650 26018.4 38139 6 2 430 110143 8 2 725 140146 10 3 150 180152 12 3 550 230145 8 2 900 14018.4 42 150 10 3 350 180154 12 3 750 23018.4 46142 6 2 650 110146 8 3 000 140145 8 2 900 13020.8 34 149 10 3 250 160154 12 3 750 200148 8 3 150 13020.8 38 151 10 3 450 160156 12
42、4 000 20020.8 42153 10 3 650 160156 12 4 250 20023.1 26145 8 2 900 110149 10 3 250 140153 12 3 650 170156 14 4 000 200146 8 3 000 11023.1 30 151 10 3 450 140155 12 3 875 170149 8 3 250 11023.1 34 153 10 3 650 140157 12 4 125 17024.5 32156 10 4 000 140159 12 4 375 170123 6 1 550 1106 ISO 2017 All rig
43、hts reservedBS ISO 42512:2017ISO 4251-2:2017(E)Tyre size designationLoad indexLIPly rating PRBasic tyre load BTLkgInflation pressure IPkPa17.5L 24 129 8 1 650 150134 10 2 120 190134 8 2 120 14019.5L 24 138 10 2 360 170142 12 2 650 210141 10 2 575 15021L 24 146 12 3 000 190151 18 3 450 250151 10 3 45
44、0 12028L 26 154 12 3 750 140158 14 4 250 17030.5L 32 162 12 4 750 140VA30.5L 32 162 12 4 750 140DH35.5L 32 179 20 7 750 190VA35.5L 32 179 20 7 750 190Table 2 AgriculturaI drive wheels Tractor tyres Tyre loads at different speeds (load/speed relationship)Maximum speedakm/hMaximum tyre loadb%10c14020
45、12025 10730 100aThe values given for the maximum tyre load also apply when drive wheel traction tyres are fitted on the front axles (steering wheels).bExpressed as a percentage of the basic tyre loads given in Table 1. If national legislation permits speeds in excess of 30 km/h, for example up to 40
46、 km/h, a tyre load of 90 % of the basis tyre load shall be permitted at a speed of 35 km/h, and a tyre load of 80 % of the basic tyre load shall be permitted at speed of 40 km/h. Tyres intended for higher speeds, for example multipurpose applications (MPT), will form the subject of a future Internat
47、ional Standard.cThis applies to drive wheel tractor tyres fitted on frontend loaders used in intermitted service. Tyre inflation pressure shall be increased by 30 kPa for operating at these overloads.Table 3 Agricultural drive wheel Tractor tyres for special cultivation work (diagonal and radial con
48、structions) Basic tyre loads (BTL) at a maximum speed of 30 km/h and at reference inflation pressures (IP)Tyre size designation 6 PR 8 PRDiagonal Radial BTL IP BTL IPkg kPa kg kPa8.3 36 8.3 R 36 9702401 0603208.3 38 8.3 R 38 8.3 42 8.3 R 42 1 055 1 2558.3 44 8.3 R 44 1 080 1 290 ISO 2017 All rights
49、reserved 7BS ISO 42512:2017ISO 4251-2:2017(E)Tyre size designation 6 PR 8 PRDiagonal Radial BTL IP BTL IPkg kPa kg kPa9.5 36 9.5 R 36 1 1302101 3352809.5 44 9.5 R 44 1 255 1 4859.5 48 9.5 R 48 1 320 1 560Table 4 Agricultural drive wheels Tractor tyres for special cultivation work (diagonal and radial constructions) Tyre
