1) Diameter: 1/2" - 6" 2) Producing standard: GB/T3091-93, BS1387, ASTM A53A SCH40 1) Diameter: 1/2" - 6" 2) Producing standard: GB/T3091-93, BS1387, ASTM A53A SCH40 3) Plain end or threaded end 4) Two kinds of Galvanized methods: Pre-galvanizing and lag-galvanizing or some others call it post-galvanizing NPSDesignatorNominal Outside DiameterOutside diameterWall thicknessCaculated werghtPcs/ ...