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Specifications of Steel Plate Thickness The specifications of steel plate thickness are as follows, in millimeters: Thin plate: 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.7mm, 0.75mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.25mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.5mm, 2.8mm, 3.0mm Medium plate: 3.2mm, 3.5mm, 3.8mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 7.0mm, 8.0mm, 9.0mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm Thick plate: 21mm to 60mm Extra thick plate: 60mm and above https://shangangsteelsupply.com/steel-plate-thickness-discrepancy-and-classification/