ISO-722-1991.pdf
INTERNATIONAL STANDARD IS0 722 Third edition 1991-02-15 Rock drilling equipment - Hollow drill steels in bar form, hexagonal and round Matckiel de forage des roches - Barres creuses, hexagonales et rondes pour fleurets Reference number IS0 722:1991(E) IS0 722:1991 (E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all 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. International Standard IS0 722 was prepared by Technical Committee ISO/TC 82, Mining. This third edition cancels and replaces the second edition (IS0 722: 1985), which has been technically revised (addition of round drill steels and extension of the range of sizes). 0 IS0 1991 All rights reserved. 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 the publisher. International Organization for Standardization Case Postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii -,-,- INTERNATIONAL STANDARD IS0 722:1991 (E) Rock drilling equipment - Hollow drill steels in bar form, hexagonal and round 1 Scope This International Standard specifies the dimensions of hexagonal and round drill steels in bar form used for rock drilling. 2 Dimensions The dimensions for hollow hexagonal and round drill steels in bar form shall comply with the dimensions given in figure 1 and table 1 and in figure2 and table 2, respectively. 2.1 Hexagonal drill steels Table 1 Nominal size S e d Size Tolerance approx min. -I -I- I 19 19,2 21,4 0 -0.4 - 22 22,4 I- 24,8 38,65 I I 0 -49 I 42,6 5,5 691 6,8 - 893 -_ 84 -.- 13 14,5 Figure 1 Dimensions in millimetres ,-q-k 3,2 I 2,4 3,2 I Z4 495 I 3,2 -,-,- IS0 722:1991$E) 2.2 Round dtill steels Figure 2 Table 2 Dimensions in millimetres Jominal size II Size Tc I - bleranre( rrZn. ( x / I 45 I 46,5 I 51 52,6 0 -1.6 16 3 UDC 622.233.6:669.14-462 Descriptors: mining equipment, drilling equipment, rock drills, drill steels, bore bits, hollow profiles, hexagonal bars, round bars, dimensions. Price based on 2 pages 2
