NATIONAL FOREWORD

This Indian Standard (Part 1) (First Revision) which is identical with ISO 965-1 : 2013 ‘ISO General purpose metric screw threads — Tolerances — Part 1: Principles and basic data’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the General Engineering and Fasteners Standards Sectional Committee and approval of the Production and General Engineering Division Council.

This standard was originally published in 2001. The first revision of this standard has been undertaken to align it with the latest version of ISO 965-1 : 2013.

This Indian Standard has been issued in five parts. Other parts in this series are:

Part 2 Limits of sizes for general purpose external and internal screw threads — medium quality

Part 3 Deviations for constructional screw threads

Part 4 Limits of sizes for hot-dip galvanized external screw threads to mate with internal screw 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

The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.