BRITISH STANDARD BS AU 50 1 4 1a 1993 ISO 4251 1 1992 (Superseding BS AU 50 1 4 1 1989) Tyres and wheels — Part 1 Tyres — Section 4 Agricultural tractor and machine tyres — Subsection 4 1a Specificati[.]
BRITISH STANDARD BS AU 50-1 4.1 a:1 993 ISO 425 -1 : 992 (Superseding BS AU 50-1 :1 989) Tyres and wheels — Part : Tyres — Section 4: Agricultural tractor and machine tyres — Subsection 4.1 a: Specification for designations and dimensions for ply rating marked series tyres UD C 62 1 5 : 63 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 0-1 4.1 a:1 993 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Automobile Standards Policy Committee (AUE/- ) to Technical Committee AUE/4, upon which the following bodies were represented: Agricultural Engineers’ Association Automobile Association British Industrial Truck Association British Pressure Gauge Manufacturers’ Association British Rubber Manufacturers’ Association Bus and Coach Council Department of Transport Freight Transport Association Institute of Road Transport Engineers (Inc) Motor Cycle Industry’s Association of Great Britain Ltd Motor Industry Research Association National Tyre Distributors’ Association Retread Manufacturers’ Association Road Haulage Association Ltd Society of Motor Manufacturers and Traders Ltd This British Standard, having been prepared under the direction of the Automobile Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on April 993 © BSI 2- 999 The following BSI references relate to the work on this standard: Committee reference AUE/4 Draft for comment 89/80263 DC ISBN 80 221 09 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy Amendments issued since publication Amd No Date Comments BS AU 0-1 4.1 a:1 993 Contents Page Committees responsible Inside front cover National foreword ii Scope Normative reference Definitions Marking Dimensions and tolerances Dynamic radius indices Tubes Annex A (informative) Tyres on nominal rim diameter codes and Table — Agricultural drive wheels — Tractor tyres (diagonal construction — normal section height) — Standard sizes, measurement rims, and dimensions Table — Agricultural drive wheels — Tractor tyres (radial construction — normal section height) — Standard sizes, measurement rims, and dimensions Table — Agricultural drive wheels — Tractor tyres (diagonal construction — low section height) — Standard sizes, measurement rims, and dimensions Table — Agricultural drive wheels — Tractor tyres (radial construction — low section height) — Standard sizes, measurement rims, and dimensions Table — Agricultural drive wheels — Tractor tyres for special cultivation work (diagonal construction) — Standard sizes, measurement rims, and dimensions Table — Agricultural drive wheels — Tractor tyres for special cultivation work (radial construction) — Standard sizes, measurement rims, and dimensions Table — Agricultural steering wheels — Tractor tyres (diagonal construction — normal section height) — Standard sizes, measurement rims, and dimensions Table — Agricultural steering wheels — Tractor tyres (diagonal construction — low section height) — Standard sizes, measurement rims, and dimensions Table — Dynamic radius indices for calculation of the forward ground speed (Tyres of diagonal and radial construction) Table — Agricultural implement tyres (diagonal construction — normal section height) — Standard sizes, measurement rims, and dimensions Table 1 — Agricultural implement tyres (diagonal construction — low section height) — Standard sizes, measurement rims and dimensions Table A — Agricultural steering wheels — Tractor tyres (diagonal construction — low section height) — Standard sizes, measurement rims, and dimensions Table A — Agricultural implement tyres (diagonal construction — normal section height) — Standard sizes, measurement rims, and dimensions Table A — Agricultural implement tyres (diagonal construction — low section height) — Standard sizes, measurement rims and dimensions List of references © BSI 2- 999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy Inside back cover i BS AU 0-1 4.1 a:1 993 National foreword This Subsection of this Part of BS AU 50, prepared under the direction of the Automobile Standards Policy Committee, is identical with ISO 4251 - : 992 Tyres (ply rating marked series) and rims for agricultural tractors and machines — Part : Tyre designation and dimensions, published by the International Organization for Standardization (ISO) This edition supersedes BS AU 50- : 989, which is withdrawn BS AU 50 is published in four Parts: — Part 1: Tyres; — Part 2: Wheels and rims; — Part 3: Valves; — Part 4: Rim profiles and dimensions ISO 4251 covers requirements for tyres (ply rating marked series) and rims for agricultural tractors and machines Other Parts of ISO 4251 have been implemented as British Standards as Subsections of BS AU 50 as follows: ISO 425 BS AU Part 2: Tyre load ratings Part Part 3: Rims Part 4 Part 4: Tyre classification and nomenclature Part Part 5: Log skidder tyres Part 4 Cross-references The Technical Committee has reviewed the provisions of ISO 4223- to which normative reference is made in the text, and has decided that they are acceptable for use in conj unction with this standard A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages to 0, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy © BSI 2- 999 BS AU 0-1 4.1 a:1 993 Scope For low section height tractor steering wheel tyres This part of ISO 42 51 establishes the designation in use and the dimensions of the ply rating marked series of tyres for agricultural tractors and of diagonal construction, an optional marking may be used in the following manner: nominal tyre width code/nominal aspect ratio nominal rim diameter machines Tyre load ratings, rim dimensions, and tyre classification and nomenclature are given in ISO 42 51 - , ISO 42 51 - and ISO 42 51 - EXAMPLE Tyre 9.5/85 – 4.2 Load rating respectively The present marking of load rating comprises the Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO 42 51 At the time of publication, the edition indicated was valid All standards are subj ect to revision, and parties to agreements b ased on this part of ISO 42 51 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated b elow Members of IEC and ISO maintain registers of currently valid International Standards ISO 42 3- : 989, Definitions of som e term s used in ply rating EXAMPLE Tyre 3.6 – 28 PR 4.3 Additional information Tub eless tyres may b e marked with the word “TUBELE SS” Additionally, classification code markings indicating tyre classifications may b e used as described in ISO 42 51 - 4, but they are not part of the size marking of the tyre Dimensions and tolerances the tyre industry — Part : Pneum atic tyres Agricultural drive wheels — Tractor tyres Definitions Standard sizes, measurement rims, design For the purposes of this part of ISO 42 51 , the dimensions of new tyres, and maximum tyre definitions given in ISO 42 3- apply dimensions in service are given in a) Table for tyres of diagonal construction with Marking normal section height; The marking of the ply rating marked series of tyres b ) Table for tyres of radial construction with consists of designations of the tyre size and load normal section height; rating, and any additional information See 4.1 c) Table for tyres of diagonal construction with to 4.3 low section height; 4.1 Tyre size The present size markings for the identification of d) Table for tyres of radial construction with low section height; tyres consist of the nominal tyre width code and the e) Table for tyres of diagonal construction for nominal rim diameter code special cultivation work; EXAMPLES Tyre 3.6 – 28 Tyre 6.5 – For tyres of radial construction, the letter “R” replaces the dash EXAMPLE Tyre 3.6 R For low section height lyres, the letter “L” is added to the nominal tyre width code EXAMPLE f) Table for tyres of radial construction for special cultivation work Agricultural steering wheels — Tractor tyres Standard sizes, measurement rims, design dimensions of new tyres, and maximum tyre dimensions in service are given in a) Table for tyres of diagonal construction with normal section height; b ) Table for tyres of diagonal construction with low section height Tyre 9.5 L – © BSI - 999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 0-1 4.1 a:1 993 Values are given in Table for agricultural drive wheel tractor tyres of diagonal and radial Standard sizes, measurement rims, design construction with normal section height and of dimensions of new tyres, and maximum tyre diagonal construction with low section height dimensions in service are given in They apply to tyres inflated the inflation a) Table 10 for tyres of diagonal construction with pressures given in ISO 4251-2toand having tyre loads normal section height; corresponding to 50 % of the maximum values b) Table 11 for tyres of diagonal construction with at 30 km/h low section height Agricultural implement tyres Dynamic radius indices Dynamic radius indices are parameters used exclusively for the calculation of forward ground speed during homologation procedures (see ISO 3965:1990, Agricultural wheeled tractors — Maximum speeds — Method of determination) Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy Tubes Whenever a tube is required it should be identified by the same designation as the tyre size in which it is to be mounted © BSI 12-1999 BS AU 50-1 4.1 a:1 993 Table — Agricultural drive wheels — Tractor tyres (diagonal construction — normal section height) — Standard sizes, measurement rims, and dimensions Dimensions in millimetres Design new tyre Tyre size Measurement rim designation width code 8.3 – 24 9.5 – 24 9.5 – 32 9.5 – 36 11.2 – 24 11.2 – 28 12.4 – 24 12.4 – 28 12.4 – 32 12.4 – 36 12.4 – 38 13.6 – 24 13.6 – 28 13.6 – 36 13.6 – 38 14.9 – 24 14.9 – 26 14.9 – 28 14.9 – 30 14.9 – 38 15.5 – 38 16.9 – 24 16.9 – 26 16.9 – 28 16.9 – 30 16.9 – 34 16.9 – 38 18.4 – 26 18.4 – 30 18.4 – 34 18.4 – 38 20.8 – 34 20.8 – 38 23.1 – 26 23.1 – 30 23.1 – 34 24.5 – 32 Section width 211 241 10 284 11 315 12 345 13 378 14 394 15 429 16 467 18 528 20 587 21 622 Overall diameter 995 050 250 355 105 205 160 260 360 465 515 210 310 515 565 265 315 365 415 615 570 335 385 435 485 585 690 450 550 650 750 735 835 605 705 805 805 In service a Maximum overall 228 260 307 340 373 408 426 463 504 570 634 672 width Maximum overall 019 076 276 381 135 235 192 292 392 497 547 246 346 551 601 305 355 405 455 655 606 379 429 479 529 629 734 498 598 698 798 787 887 661 761 861 865 diameter b a Minimum new tyre overall diameter shall be calculated on the basis of a tolerance of – % on design section height b Figures are based on tyres with classification code R–1 The tractor manufacturer must recognize that tyres with deep tread and related increased overall diameter may be used © BSI 12-1999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 50-1 4.1 a:1 993 Table — Agricultural drive wheels — Tractor tyres (radial construction — normal section height) — Standard sizes, measurement rims, and dimensions Dimensions in millimetres Design new tyre Tyre size Measurement designation rim width code 8.3 R 24 9.5 R 24 9.5 R 32 9.5 R 36 11.2 R 24 11.2 R 28 12.4 R 24 12.4 R 28 12.4 R 32 12.4 R 36 12.4 R 38 13.6 R 24 13.6 R 28 13.6 R 36 13.6 R 38 14.9 R 24 14.9 R 26 14.9 R 28 14.9 R 30 15.5 R 38 16.9 R 24 16.9 R 26 16.9 R 28 16.9 R 30 16.9 R 34 16.9 R 38 18.4 R 26 18.4 R 30 18.4 R 34 18.4 R 38 20.8 R 34 20.8 R 38 Section width 211 241 10 284 11 315 12 345 13 378 14 394 15 429 16 467 18 528 Overall diameter 985 040 245 345 095 200 145 250 350 450 500 190 295 500 550 245 295 350 400 565 320 370 420 475 575 675 440 545 645 750 735 835 In service a Maximum overall Maximum overall width diameter 228 260 307 340 373 408 426 463 504 570 001 058 263 363 115 220 167 272 372 472 522 214 319 524 574 271 321 376 426 589 349 399 449 504 604 704 482 582 682 782 770 870 a Minimum new tyre overall diameter shall be calculated on the basis of a tolerance of – % on design section height Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy © BSI 12-1999 BS AU 50-1 4.1 a:1 993 Table — Agricultural drive wheels — Tractor tyres (diagonal construction — low section height) — Standard sizes, measurement rims, and dimensions Dimensions in millimetres Design new tyre Tyre size Measurement rim designation width code Overall Section width 25 27 28 L – 26c 30.5 L – 32 In service diameter 714 775 Maximum overall a 615 820 Maximum overall width 771 837 diameter b 673 881 a Minimum new tyre overall diameter shall be calculated on the basis of a tolerance of – % on design section height b Figures are based on tyres with classification code R–1 The tractor manufacturer must recognize that tyres with deep tread and related increased overall diameter may be used c Optional size designation 28.1 – 26 Table — Agricultural drive wheels — Tractor tyres (radial construction — low section height) — Standard sizes, measurement rims, and dimensions Dimensions in millimetres Design new tyre Tyre size Measurement rim designation width code 30.5 L R 32 27 Overall Section width 775 In service diameter a 820 Maximum overall Maximum overall width diameter 837 860 a Minimum new tyre overall diameter shall be calculated on the basis of a tolerance of – % on design section height Table — Agricultural drive wheels — Tractor tyres for special cultivation work (diagonal construction) — Standard sizes, measurement rims, and dimensions Dimensions in millimetres Design new tyre Tyre size Measurement rim designation width code 7.2 – 36 7.2 – 40 8.3 – 36 8.3 – 42 8.3 – 44 9.5 – 36 9.5 – 44 9.5 – 48 Section width 6.0 183 7.0 211 8.0 241 In service Overall diameter 250 350 300 450 500 355 555 655 Maximum Maximum overall overall width diameter 270 370 320 475 525 380 580 680 198 228 260 Table — Agricultural drive wheels — Tractor tyres for special cultivation work (radial construction) — Standard sizes, measurement rims, and dimensions Dimensions in millimetres Design new tyre Tyre size Measurement designation rim width code 8.3 R 36 8.3 R 42 8.3 R 44 9.5 R 36 9.5 R 44 9.5 R 48 Section width 7.0 211 8.0 241 © BSI 12-1999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy In service Overall Maximum overall Maximum overall diameter width diameter 290 440 495 345 550 650 228 260 315 465 520 365 575 675 BS AU 50-1 4.1 a:1 993 Table — Agricultural steering wheels — Tractor tyres (diagonal construction — normal section height) — Standard sizes, measurement rims, and dimensions Dimensions in millimetres Design new tyre Tyre size Measurement rim designation width code Overall Section width 4.00 – 12 4.00 – 15 5.00 – 15 5.50 – 16 6.00 – 16 4.5 6.50 – 16 6.50 – 20 4.5 7.50 – 16 7.50 – 18 5.5 7.50 – 20 9.00 – 16 10.00 – 16 11.00 – 16 10 112 140 150 165 175 205 234 274 315 diameter 535 610 655 710 735 760 865 805 860 915 855 895 965 In service Maximum overall a width Maximum overall 553 628 677 734 761 788 894 837 892 948 891 934 010 122 153 164 180 191 223 255 299 343 diameter b a Minimum new tyre overall diameter shall be calculated on the basis of a tolerance of – % on design section height b Figures are based on tyres with classification code F–2 Table — Agricultural steering wheels — Tractor tyres (diagonal construction — low section height) — Standard sizes, measurement rims, and dimensions Dimensions in millimetres Design new tyre Tyre size Optional size Measurement designation marking rim width code 7.5 L – 15 8.25/85 – 15 9.5 L – 15 9.5/85 – 15 11 L – 15 11.5/75 – 15 Section width 210 240 280 Overall diameter 745 785 815 In service a Maximum Maximum overall overall width diameter 229 262 305 774 817 850 b a Minimum new tyre overall diameter shall be calculated on the basis of a tolerance of – % on design section height b Figures are based on tyres with classification code F–2 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy © BSI 12-1999 BS AU 50-1 4.1 a:1 993 Table — Dynamic radius indices for calculation of the forward ground speed (tyres of diagonal and radial construction) Tyre size designation Dynamic radius indices Diagonal Radial Tyre size designation Dynamic radius a indices Diagonal Radial mm – R 470 mm 5 – 38 5 R 38 745 – R 495 – R 62 – 32 R 32 595 – 6 R 645 – 36 R 36 645 – R 670 – 30 R 30 695 – 34 R 34 745 – 38 R 38 795 – R 670 11 – 24 1 R 24 51 11 – 28 1 R 28 565 – 24 R 24 540 – 28 R 28 590 – 30 R 30 72 – 32 R 32 640 – 34 R 34 770 – 36 R 36 690 – 38 R 38 82 – 38 R 38 72 – 34 R 34 81 – 38 R 38 855 – R 560 – R 61 – 36 R 36 71 – 38 R 38 740 – 4 R 590 – R 61 – R 640 – 30 R 30 665 – 38 NO TE a 765 a – 730 – 30 790 – 34 840 – 32 835 28 L – 26 730 30 L – 32 845 D esigners are reminded that practical speed limits may b e imposed b y ap propriate legislative bodies The values listed not include the manufacturing tolerances of the tyres © BSI - 999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 50-1 4.1 a:1 993 Table — Agricultural implement tyres (diagonal construction — normal section height) — Standard sizes, measurement rims, and dimensions Dimensions in millimetres Design new tyre Tyre size Measurement rim designation width code 4.00 – 4.00 – 12 4.00 – 15 5.00 – 15 5.50 – 16 5.90 – 15 6.00 – 16 6.40 – 15 6.50 – 16 7.00 – 12 7.50 – 16 7.50 – 18 7.50 – 20 7.50 – 24 9.00 – 16 10.00 – 15 11.25 – 24 11.25 – 28 Section width 112 112 112 130 150 150 158 163 173 187 202 202 202 202 234 274 325 325 3 3 4 4.5 4.5 5.5 5.5 5.5 5.5 10 10 In service Overall diameter a 418 519 595 639 685 665 712 684 735 652 785 836 887 989 848 853 171 273 Maximum overall Maximum overall width diameter 122 122 122 142 162 163 172 178 188 204 220 220 220 220 254 299 354 354 429 536 612 658 707 688 736 708 761 680 809 866 917 020 883 891 216 318 a Minimum new tyre overall diameter shall be calculated on the basis of a tolerance of – % on design section height Table 1 — Agricultural implement tyres (diagonal construction — low section height) — Standard sizes, measurement rims and dimensions Dimensions in millimetres Design new tyre Tyre size designation 5.5/85 – 10.0/80 – 12 10.5/80 – 18 12.0/75 – 18 12.5/80 – 18 13.0/65 – 18 14.5/75 – 20 15.0/70 – 18 16.0/70 – 20 9.5 L – 15 11 L – 15 11 L – 16 Measurement rim width code 9 9 11 12 13 14 8 In service Overall diameter Section width 145 264 274 299 308 336 372 391 418 241 279 279 Non-traction pattern 475 710 885 915 965 890 060 990 075 767 777 803 a Traction pattern 493 730 907 937 987 912 082 012 097 782 796 821 Maximum overall Maximum overall width 152 277 288 314 323 353 390 411 439 263 305 305 diameter Non-traction pattern 495 730 906 938 990 912 087 017 105 786 797 822 Traction pattern a Minimum new tyre overall diameter shall be calculated on the basis of a tolerance of – % on design section height Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy 506 751 930 961 014 935 111 040 126 802 816 842 © BSI 12-1999 BS AU 50-1 4.1 a:1 993 Annex A (informative) Tyres on nominal rim diameter codes 5.3 and 6.1 The technical data of the former standardized tyres with nominal rim diameter codes 15.3 and 16.1 are given in Table A.1, Table A.2 and Table A.3 Table A.1 — Agricultural steering wheels — Tractor tyres (diagonal construction — low section height) — Standard sizes, measurement rims, and dimensions Dimensions in millimetres Design new tyre Tyre size Optional size Measurement rim designation marking width code Section Overall width 14 L – 16.1 14.0/80 – 16.1 11 In service diameter 360 a 985 Maximum Maximum overall overall width diameter 392 b 031 a Minimum new tyre overall diameter shall be calculated on the basis of a tolerance of – % on design section height b Figures are based on tyres with classification code F–2 Table A.2 — Agricultural implement tyres (diagonal construction — normal section height) — Standard sizes, measurement rims, and dimensions Dimensions in millimetres Design new tyre Tyre size Measurement rim designation width code 13.50 – 16.1 11 Section width 353 In service Overall diameter a 021 Maximum overall Maximum overall width diameter 385 070 a Minimum new tyre overall diameter shall be calculated on the basis of a tolerance of – % on design section height Table A.3 — Agricultural implement tyres (diagonal construction — low section height) — Standard sizes, measurement rims and dimensions Dimensions in millimetres Design new tyre Tyre size Measurement designation rim width code Overall diameter Section width 10.0/75 – 15.3 11.5/80 – 15.3 14 L – 16.1 9 11 In service 264 290 356 Non-traction pattern 760 845 940 a Traction pattern 780 867 — Maximum overall Maximum overall width 277 305 388 diameter Non-traction Traction pattern pattern 779 868 966 a Minimum new tyre overall diameter shall be calculated on the basis of a tolerance of – % on design section height © BSI 12-1999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy 800 891 — 10 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy blank BS AU 0-1 4.1 a:1 993 List of references See national foreword © BSI - 999 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS AU 0-1 4.1 a:1 993 ISO 4251 -1 : BSI — British Standards Institution 992 BS I is the indep endent national b ody res p ons ib le for p rep aring Britis h S tandards It p res ents the UK view on s tandards in E urop e and at the international level It is incorp orated b y Royal C harter Revisions Britis h S tandards are up dated b y amendment or revis ion Us ers of Britis h S tandards should make s ure that they p oss es s the latest amendments or editions It is the constant aim of BS I to imp rove the quality of our p roducts and services We would b e grateful if anyone finding an inaccuracy or amb iguity while us ing this Britis h S tandard would inform the S ecretary of the technical committee res p ons ib le, the identity of which can b e found on the inside front cover Tel: 02 89 96 90 00 Fax: 02 89 96 40 BS I offers memb ers an individual up dating s ervice called PLUS which ens ures that s ub s crib ers automatically receive the lates t editions of s tandards Buying standards O rders for all BS I, international and foreign s tandards p ub lications s hould b e addres s ed to C us tomer S ervices Tel: 899 00 Fax: 899 7001 In res p ons e to orders for international standards , it is BS I p olicy to sup p ly the BS I imp lementation of thos e that have b een p ub lis hed as Britis h S tandards, unless otherwis e requested Information on standards BS I p rovides a wide range of information on national, E urop ean and international standards through its Lib rary and its Technical H elp to E xp orters S ervice Various BS I electronic information s ervices are also availab le which give details on all its p roducts and s ervices C ontact the Information C entre Tel: 02 89 96 71 1 Fax: 02 89 96 048 S ub s crib ing memb ers of BS I are kep t up to date with s tandards develop ments and receive sub s tantial discounts on the p urchase p rice of s tandards For details of thes e and other b enefits contact Memb ership Adminis tration Tel: 02 89 96 70 02 Fax: 02 89 96 00 Copyright C op yright s ub s is ts in all BS I p ub lications BS I als o holds the cop yright, in the UK, of the p ub lications of the international s tandardization b odies E xcep t as p ermitted under the C op yright, D es igns and Patents Act 988 no extract may b e rep roduced, s tored in a retrieval s ystem or transmitted in any form or b y any means – electronic, p hotocop ying, recording or otherwis e – without p rior written p ermis s ion from BS I This does not p reclude the free us e, in the cours e of imp lementing the standard, of necess ary details such as s ymb ols, and size, typ e or grade designations If thes e details are to b e used for any other p urp os e than imp lementation then the p rior written p ermiss ion of BS I must b e ob tained If p ermis sion is granted, the terms may include royalty p ayments or a licensing agreement D etails and advice can b e ob tained from the C op yright Manager BS I 89 C his wick H igh Road London W4 4AL Reprodu ced by I H S u n d er l i cen se wi th BSI - 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