Indian Standard : ISO general purpose metric threads - part 4  lines up to and including 11 kV 

 - New Delhi  Bureau of Indian Standards  2001 
 - 2p.  
<br/><br/> IS 4218(part 4) : 2001, ISO 262 : 1998 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reference