ISO INTERNATIONAL 22 STANDARD Second edition 1991-12-15 Belt drives --- Flat transmission belts and corresponding pulleys -- Dimensions and tolerances Transmissions par courroies -- Courroies plates de transmission et poulies correspondantes --- Dimensions et tolerances Referencenumber ISO 22:1991(E) Not for Resale working permitted without license from IHS ISO 22:1991(E) Foreword Iso (the international Organization for Standardization) is a woridwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through iso technical committees. which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work. iso coliaborates closely with the International Electrotechnical Commission (IEC) on alil matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. Iso/TC 41, Pulleys and belts (including veebelts), Sub-Committee SC 1, Veebelts and grooved pulleys. edition This second edition cancels and .replaces the first (IsO 22:1975), together with isO 63:1975, 1sO 99:1975 and 1sO 100:1984, of which it constitutes a technical revision. Annexes A and B of this international Standard are for information oniy 1SO1991 or by, any means, electronic or mechanical, including photocopying and microfilm, without permlsslon in writing from the publisher. International Organization for Standardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland nternational Organization for Standardization Cop Not for Resale from IHS ISO 22:1991(E) INTERNATIONAL STANDARD Belt drives -- Flat transmission belts and corresponding pulleys -- Dimensions and tolerances Scope from the R 20 series of preferred numbers in ac- 1 cordance with IsO 3. The other vaiues are chosen from the R 40 series. This International Standard specifies the principa! dimensions of flat transmission belts and of the cor- responding pulleys. Annexes A and B give, respectively, recommended crowns of the pulleys and the ordinary recom- correspondance between the widths of mended Table 1 - Lengths of belts belts and the widths of the puleys used. Dimensions in millimetres Preferential series1) Secondary series Normative reference 500 530 560 600 The following standard contains provisions which, 630 670 710 750 through reference in this text, constitute provisions 800 850 of this International Standard. At the time of publi- 900 950 cation, the edition indicated was valid. All standards 1 000 1 060 are subject to revision, and parties to agreements 1120 1 180 based on this International Standard are encour- 1 320 1 250 aged to investigate the possibility of applying the 1 500 1 400 most recent edition of the standard indicated below. 1 600 1 700 1 800 1 900 Members of IEC and ISO maintain registers of cur- 2 000 rently valid International Standards. 2 240 2 500 1so 3:1973, Preferred numbers -- Series of preferred 2 800 numbers. 3150 3 550 4 000 Beits 4.500 5 000 Should the range of lengths given in table1 be 3.1 Length 1) considered insufficient, it may be completed: The lengths specified are the inside lengths under outside the limits, with other terms from the R 20 normal fitting tension. series of preferred numbers; The manufacturer shall take account of the differ- exceptionally, between two consecutive lengths ence between the length under normal fitting ten- with terms from the R 40 series (from 2 000 mm). sion and the fength without tension. This difference depends on the nature of the belt and its method of manufacture. NOTE 1 If required for any technical reason, it is per- missible to cut a length of belting and braid it toget