ISO INTERNATIONAL STANDARD 1502 Second edition 1996-02-01 IsO general-purpose metric screw threads - Gauges and gauging Filetages métriques Iso pour usages generaux Calibres a limites et vérification ISO Referencenumber ISO 1502:1996(E) Standardizatior No reproduction or networking permitted without license from IHS Not for Resale ISO 1502:1996(E) Contents Page 1 Scope 2 Normative references 3 Symbols and abbreviations 4 Types of gauges 3 4.1 Gauges for external threads of workpieces and their check plugs and setting plugs 3 4.2 Gauges for internal threads of workpieces 3 5 Gauging of workpieces 3 5.1 Gauging of external threads 3 5.2 Gauging of internal threads 5.3 inspection gauging 4 6 Reference temperature 4 Function, checking and use of gauges 7.1 Gauges for external threads of workpieces and their check plugs and setting plugs 5 7.2 Gauges for internal threads of workpieces 8 8 Tolerance zones for the diameters of gauges (see figures 1 and 2) 8 6 Tolerance zones for plain gauges (see figures 3 and 4) 11 10 Thread profiles for gauges 13 10.1 Profiles with complete flanks (see figures 5 and 6) 13 10.2 Profiles with truncated flanks (see figures 7 and 8) 16 10.3 Displacement of the clearance groove for a profile with truncated flanks 18 11 General features of screw gauges 19 11.1 Gauges for external threads of workpieces 19 11.2 Gauges for internal threads of workpieces 19 ISO1996 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced microfilm, without permission in writing from the publisher. International Organization for Standardization CasePostale56·CH-1211Geneve20·Switzerland Printed in Switzerland 11 CISO ISO 1502:1996(E) 11.3 Blunt start of thread 19 12 Tolerances and permissible wear for pitch diameters of gauges (see tables 4to 9) 21 13 Formulae for calculation of gauge limits 23 13.1 Screw gauges for external threads of workpieces 23 13.2 Plain gauges for the major diameters of external threads of workpieces 23 13.3 Screw gauges for internal threads of workpieces 23 13.4 Plain gauges for the minor diameters of internal threads of workpieces 23 Annex A Bibliography 27 ii Copyright International Organization for Standardization r license with ISC networking permitted without license from IHS Not for Resale