Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Second Revision) which is identical with ISO 225 : 2010 ‘Fasteners - Bolts, screws, studs and nuts - Symbols and descriptions of dimensions’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the General Engineering and Fasteners Standards Sectional Committee and approval of the Production and General Engineering Division Council.

The original version of this standard IS 8536 : 1977 ‘Dimensioning of fasteners’ was based on ISO/DIS 1891-2 ‘Fasteners - Bolts, screws, nuts and accessories — Terminology and nomenclature’ issued by ISO. It did not cover symbols, which were included in the first revision. By adoption of ISO 225 : 1983, this Indian Standard, in its first revision, was aligned with the International Standard. The second revision of this standard has been undertaken to align it with the latest version of ISO 225 : 2010.The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviation. Certain terminologies and conventions are, however, not identical to those used in the 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 decimal marker, while in Indian Standards, it is current practice to use a full point (.) as the decimal marker.