ISO INTERNATIONAL STANDARD 965-2 Third edition 1998-12-15 IsO general purpose metric screw threads Tolerances - Part 2: Limits of sizes for general purpose external and internal screw threads Medium quality Filetages métriques IsO pour usages généraux - Tolérances Partie 2: Dimensions limites pour filetages interieurs et exterieurs d'usages géneraux-Qualité moyenne [so Referencenumber ISO 965-2:1998(E) HS unde I without license from IHS Not for Resale ISO 965-2:1998(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has liaison with isO, also take part in the work. sO 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 International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 965-2 was prepared by Technical Committee ISO/TC 1, Screw threads, Subcommittee SC 2, Tolerances. This third edition cancels and replaces the second edition (IsO 965-2:1980), which has been technically revised. ISO 965 consists of the following parts, under the general title ISO general purpose metric screw threads - Tolerances Part 1: Principles and basic data Part 2: Limits of sizes for general purpose bolt and nut threads - Medium quality Part 3: Deviations for constructional screw threads Part 4: Limits of sizes for hot-dip galvanized external threads to mate with internal threads tapped with tolerance position H or G after galvanizing Part 5: Limits of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size of tolerance position h before galvanizing ISO1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic nternationalOrganizationforStandardizatior Case postale 56 · CH-1211 Geneve 20 · Switzerland Internet [email protected] Printed in Switzerland onal Organization for Standardizatio INTERNATIONAL STANDARD @ISO ISO 965-2:1998(E) IsO general purpose metric screw threads Tolerances - Part 2: Limits of sizes for general purpose external and internal screw threads Medium quality 1 Scope This part of isO 965 specifies limits of sizes for pitch and crest diameters for IsO general purpose metric screw threads (M) conforming to ISO 262 having basic profile according to ISO 68-1. The limits of sizes for the tolerance quality specified are derived from the fundamental deviations and tolerances specified in ISO 965-1. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IsO 965. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of isO 965 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IsO 68-1:1998, ISO general purpose screw threads Basic profile — Part 1: Metric screw threads. IsO 262:1998, IsO general purpose metric screw threads - Selected sizes for screws, bolts and nuts. IsO 965-1:1998, ISO general purpose metric screw threads — Tolerances - Part 1: Principles and basic data. ISO 5408:1983, Cylindrical screw threads — Vocabulary. 3 Definitions For the purpose of this part of ISO 965 the definitions given in ISO 5408 apply. 4 Designation A screw thread in conformity with this part of ISO 965 shall be designated according to I