With 15 modern high-frequency welded and 4 automated hot dip galvanized steel pipe production lines,our plant has become a main export production base of hot dip galvanized steel pipes in China.Our products can be used for water, gas and oil transportation as well as construction applications. By using modern production equipment, inspection and testing methods, our pipes strictly adhere to BS 1387/1985 and ASTM A53A SCH40.And with its superior quality,our product has passed the ISO9002 quality system certification.Welded Steel Pipes Light Class BS 1387/67 Standard Nom.Size Max.Outer Dia. Min.Outer Dia. Wall Thickness 1/2" 21.40 mm 21.00 mm 2.00 mm 3/4" 26.90 mm 26.40 mm 2.35 mm 1" 33.80 mm 33.20 mm 2.65 mm 1.1/4" 42.50 mm 41.90 mm 2.65 mm 1.1/2" 48.40 mm 47.80 mm 2.90 mm 2" 60.20 mm 59.60 mm 2.90 mm 2.1/2" 76.00 mm 75.20 mm 3.25 mm 3" 88.70 mm 87.90 mm 3.25 mmWelded Steel Pipes medium Class BS 1387/67 Standard Nom.Size Max.Outer Dia. Min.Outer Dia. Wall Thickness 1/2" 21.70 mm 21.10 mm 2.65 mm 3/4" 27.20 mm 26.60 mm 2.65 mm 1" 34.20 mm 33.40 mm 3.25 mm 1.1/4" 42.90 mm 42.10 mm 3.25 mm 1.1/2" 48.80 mm 48.00 mm 3.25 mm 2" 60.80 mm 59.80 mm 3.65 mm 2.1/2" 76.60 mm 75.40 mm 3.65 mm 3" 89.50 mm 88.10 mm 4.05 mmWelded Steel Pipes ASTM Standard Nom.Size Outer Diameter Wall Thickness 1/2" 21.30mm 2.77mm 3/4" 26.70mm 2.87mm 1" 33.40mm 3.38mm 1.1/4" 42.20mm 3.56mm 1.1/2" 48.30mm 3.68mm 2" 60.30mm 3.91mm 2.1/2" 73.00mm 5.16mm 3" 88.90mm 5.49mmAlso supplying other sizes unlisted above.