EN 26789:1994

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Assembly tools for screws and nuts - Hand torque tools - Requirements and test methods (ISO 6789:1992)Schraubwerkzeuge - Handbetätigte Drehmoment-Werkzeuge - Anforderungen und Prüfungen (ISO 6789:1992)Outils de manoeuvre pour vis et écrous - Outils dynamétriques a commande manuelle - Exigences et méthodes d'essai (ISO 6789:1992)Assembly tools for screws and nuts - Hand torque tools - Requirements and test methods (ISO 6789:1992)25.140.30Hand-operated toolsICS:Ta slovenski standard je istoveten z:EN 26789:1994SIST EN 26789:2000en01-december-2000SIST EN 26789:2000SLOVENSKI
STANDARD
INTERNATIONAL STANDARD IS0 6789 Second edition 1992-l 2-o 1 Assembly tools for screws and nuts - Hand torque tools - Requirements and test methods Outils de mancleuvre pour vis et &x-ous - Oufils dynamom commande manuelle - Exigent es et mkthodes d’essai Hriques B Reference number IS0 6789: 1992(E) SIST EN 26789:2000

IS0 6789:1992(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 6789 was prepared by Technical Committee ISO/TC 29, Small tools, Sub-Committee SC 10, Spanners and wrenches. This second edition cancels and replaces the first edition (IS0 6789:1982 and IS0 7855:1985), of which it constitutes a technical revision. Annexes A and B form an integral part of this International Standard. Annex C is for information only. 0 IS0 1992 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-121 1 Genkve 20 l Switzerl and Printed in Switzerland ii SIST EN 26789:2000

INTERNATIONAL STANDARD IS0 6789:1992(E) Assembly tools for screws and nuts - Hand torque tools - Requirements and test methods 1 Scope - Class D: screwdriver, adjustable, graduated The present International Standard specifies the re- quirements and describes the test methods and marking of hand torque tools used for controlled tightening of bolted connections. - Class E: screwdriver, fixedly adjusted - Class F: screwdriver, adjustable, non- graduated It applies to torque tools according to clause 2, in particular to indicating and setting torque wrenches according to numbers 258 and 259 of IS0 1703. 3 Requirements 2 Classification The torque tools to which this International Standard applies are classified as follows: a) Type I: Indicating torque tools (see annex A) - Class A: wrench, torsion or flexion bar - Class B: wrench, rigid housing, with scale or dial or display - Class C: wrench, rigid housing and electronic measurement - Class D: screwdriver, with scale or dial or display - Class E: screwdriver, with electronic measurement b) Type II: Setting torque tools (see annex B) - Class A: wrench, adjustable, graduated - Class B: wrench, fixedly adjusted - Class C: wrench, adjustable, non-graduated 3.1 Assignment of the driving square The size of the driving square is a function of the maximum torque value of the respective torque tool. The assignment is carried out according to the val- ues given in table 1. Table 1 / Maximum torque value Driving square nominal size 1) N-m mm 30 613 135 10 340 12,5 1 000 20 2 700 25 I 1) in accordance with IS0 1174. 3.2 Specified measuring range The requirements and test methods according to this International Standard cover a specified meas- uring range from 20 % to 100 % of the maximum torque value of the respective tool. The scales of torque tools of type I shall be marked with a zero position. SIST EN 26789:2000

IS0 6789:1992(E) 3.3 Scales The increment between two grad uatio n marks of a scale shall not exceed 5 % of the maxi mum value. 3.4 Tolerances 3.4.1 Indicating torque tools (type I) Permissible deviation of the torque value indicated by the tool from the simultaneous indication of the test device shall be - Class
...