Model Number: zs-007 Brand Name: tzcc Key Specifications/Special Features: Outside diameter: 8-100" (200-2540mm)Wall thickness: 6-30mmLength: 12, 11.8, 5.8, 6m, or as randomSeam: SAW (Spiral welded), SSAW (Spiral submerged-arc welded), HSAW, (helical submerged Arc welded)Surface: black painted, galvanized, varnish, anti-rust oiled, anti-rustarnishedStandard export packing or as requiredTolerance of outer diameter: (OD<508mm): ±0.75% or ±2.5mm (minimum value first)(OD>=508mm): ±0.5% or ±4.5mm (minimum value first)Tolerance of thickness: (OD>=508mm): ±10%(OD<508mm): ±12.5%