supply of galvanised mild steel tubesgalvanised mild steel tubes, galvanised mild steel tubes electrical resistance welded ( erw ) / high frequency induction welded ( hfiw ) / hot finished welded ( hfw ) conforming to is.1239 / part-1 / 1990 ( fifth rev ) with amdt no 1 to 5 screwed at both ends as per is.554 / 1985 socketed at one end and other end protected with plastic thread protector. the socket conforming to is.1239 / part-ii / 1992 ( fourth rev ) with amdt no.1 in random length of 4 to 7 mtrs .g.i pipe shall be duly isi marked as per statutory requirement nominal bore dia 25mm medium grade. csd / per , sr tamil nadu 3390.00 metre