ICS 25.120.10                         PGD 04

Reaffirmed 2021

1NATIONAL FOREWORD

This Indian Standard (Part 1) (Second Revision) which is identical with ISO 6752 : 2008 ‘Round punches with 60 degrees conical head and straight shank’ issued by the International Organization for Standardization ( ISO ) was adopted by the Bureau of Indian Standards on the recommendation of the Metal Forming Machines Sectional Committee and approval of the Production and General Engineering Division Council.

Due to increased volume of work being done on hand-operated and power-operated presses in the country, it had created a need for the standardization of tooling elements for use on such machines. Much of the work produced by press working tools necessitates the piercing of holes. To fulfill this need, this Indian Standard was first published in 1967 to cover the general requirements for roundpiercing punches up to 14.4 mm effective diameter for making round holes.

Subsequently, in the passage of time, many changes had been introduced in the industry to suit the need of the user industries. To bring those changes in this standard, the standard had been revised to bring out in four parts based on the relevant ISO Standards in 2002. Now, with the revision of the ISO Standards on the subject, this standard is revised in three parts. Other parts are:

Part 2 Punches with cylindrical head and straight or reduced shank (first revision)

Part 3 Round punches with 60° conical head and reduced shank (first revision)

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain 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.