supply and delivery of isi marked 100 mm dia nb galvanised miled steel tube medium conforming to is 1239 part i 2004 sixth revision with latest amendment , supply & delivery of isi marked 100 mm. dia nb galvanised miled steel tube ( medium ) conforming to is: 1239 ( part-i ) / 2004 ( sixth revision ) with latest amendment. , supply and delivery of following dia isi marked galvanised mild steel tube ( medium class ) electric resistance welded ( erw ) / high frequency induction welded ( hfiw ) conforming to is: 1239 ( part-i ) / 2004 ( sixty revision ) with amendment no. 1 to 4 screwed at both ends as per is: 554 / 1999, socketed at one end and other end protected with plastic thread protector, the socket conforming to is; 1239 ( part-ii ) / 1992 ( forth revision ) with amendment no. 1 to 3 in random length of 4 to 7 mtrs. in the following nominal bore size. 100 mm. dia g.i. pipe ( medium class ) [ jindal / utkarsh / nezone / bst infratech ltd / bansal ( skipper ) or any other non tata phe approved brand ]