... , 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25.4mm, 30mm, 31.8mm, 50mm, 50.8mm, 63mm, 63.5mm, 76mm, 89mm, 101mm, 114mm, 133mmSquare pipe ... .15mm b)Thickness: ±10% of wall thickness c)Length: ±4.8mm – 0mm welded and seamless tube and pipe 1)STD:A312 ...