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Contact SupplierIndian Standards: Specification IS: 1239 (Part-I) 1990 (Light, Medium & Heavy Series) Black & galvanized, plain end screwed and socketed up to 100 mm NB all series, 125 & 150 mm NB. 2. ... Indian Standards: Specification IS: 3589-1991 ERW Steel Tubes 150 mm to 400 mm NB.4.