Indian standard specification for slotted countersunk head and slotted raised countersunk head screws (diameter range 1.6 to 20mm) 
Indian Standards Institution 
 - New Delhi  Indian Standards Institution  1973 
 - 10p. 
<br/><br/> IS 1365 : 1968 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Screws-Standards<br/> Standards <br/>NASA Thesaurus 
<br/><br/><label>Universal Decimal Class. No.: </label>083.7:621.882.215.3  / ISI